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


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