full-disclosure - [FD] Trojan-Downloader.Win32.VB.abb / Insecure Permissions

Open Source and information security mailing list archives

Date: Sat, 25 Sep 2021 21:11:45 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Trojan-Downloader.Win32.VB.abb / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/8f81373b0f0e6f60206a1a707de2ed77.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Trojan-Downloader.Win32.VB.abb
Vulnerability: Insecure Permissions
Description: The malware creates an executable with an ".axd" extension and
insecure permissions under c:\ drive granting change (C) permissions to the
authenticated user group. Standard users can rename the executable dropped
by the malware to disable it or replace it with their own executable. Then
wait for a privileged user to logon to the infected machine to potentially
escalate privileges.
Type: PE32
MD5: 8f81373b0f0e6f60206a1a707de2ed77
Vuln ID: MVID-2021-0345
Dropped files: WINDOWSsystem32adoax.axd
Disclosure: 09/25/2021

Exploit/PoC:
C:\>cacls WINDOWSsystem32adoax.axd
C:\WINDOWSsystem32adoax.axd BUILTIN\Administrators:(ID)F
                            NT AUTHORITY\SYSTEM:(ID)F
                            BUILTIN\Users:(ID)R
                            NT AUTHORITY\Authenticated Users:(ID)C

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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