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

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Message-ID: <CAAHK0WTzaB4ykS-MAUJOxibCU3Z5jzx7qA=dEJZ7-QOxJu4O4Q@mail.gmail.com>
Date: Wed, 21 Apr 2021 20:20:30 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Trojan-Dropper.Win32.Agent.xtp / Insecure Permissions

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/360bbc9e0926488f085029948ff6c759.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Trojan-Dropper.Win32.Agent.xtp
Vulnerability: Insecure Permissions
Description: The malware creates an insecure dir named "remove" 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: 360bbc9e0926488f085029948ff6c759
Vuln ID: MVID-2021-0180
Disclosure: 04/21/2021

Exploit/PoC:
C:\>cacls remove
C:\remove 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 remove
 Volume in drive C has no label.

 Directory of C:\remove

04/20/2021  11:54 PM             5,090 clngbuster.reg
04/20/2021  11:54 PM               192 deleta.CMD
04/20/2021  11:54 PM               155 mata.CMD
04/20/2021  11:54 PM           146,232 movefile.exe
04/20/2021  11:54 PM           234,536 psexec.exe
04/20/2021  11:54 PM           187,184 pskill.exe
04/20/2021  11:54 PM               126 remove.CMD
04/20/2021  11:54 PM               237 removeGB.CMD
04/20/2021  11:54 PM           303,616 SetACL.exe
04/20/2021  11:54 PM             2,971 setreg.CMD
              10 File(s)        880,339 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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