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

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Message-ID: <CAAHK0WSCoKC+2dpyNL_nHL4gWsfv_irM_CjmUV+C+VVf6g1f8Q@mail.gmail.com>
Date: Sun, 18 Apr 2021 17:08:50 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Trojan.Win32.Agent.hsm / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/c58d5aecd223ac95ae5fab6dcd69e953.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Trojan.Win32.Agent.hsm
Vulnerability: Insecure Permissions
Description: Agent.hsm creates an insecure dir named "LOL" 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: c58d5aecd223ac95ae5fab6dcd69e953
Vuln ID: MVID-2021-0178
Dropped files: jah.exe
Disclosure: 04/18/2021

Exploit/PoC:
C:\>cacls LOL
C:\LOL 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

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

 Directory of C:\LOL

12/30/2019  04:16 AM            45,056 jah.exe
               1 File(s)         45,056 bytes

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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