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


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