full-disclosure - [FD] Trojan.Win32.Agent.zfgh / Insecure Permissions

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Date: Tue, 13 Apr 2021 20:21:06 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Trojan.Win32.Agent.zfgh / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/a2017b547da2f06c6d7c02398cc481f6.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Trojan.Win32.Agent.zfgh
Vulnerability: Insecure Permissions
Description: Agent.zfgh creates an hidden insecure dir named "drv" under
c:\ drive and grants change (C) permissions to the authenticated user
group. Standard users can rename the executables 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: a2017b547da2f06c6d7c02398cc481f6
Vuln ID: MVID-2021-0169
Dropped files: explorer.exe, MSINET.OCX, MSWINSCK.OCX
Disclosure: 04/13/2021

Exploit/PoC:
C:\>attrib -s -h drv

C:\>dir drv
 Volume in drive C has no label.

 Directory of C:\drv

06/14/2012  11:58 PM           290,816 explorer.exe
04/12/2021  04:05 PM           115,920 MSINET.OCX
04/12/2021  04:05 PM           124,688 MSWINSCK.OCX

C:\>cacls drv
C:\drv BUILTIN\Administrators:(OI)(CI)(ID)F
       NT AUTHORITY\SYSTEM:(OI)(CI)(ID)F
       BUILTIN\Users:(OI)(CI)(ID)R
       NT AUTHORITY\Authenticated Users:(ID)C
       NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(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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