Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/a6916fb9b824e3d2edfe46be69ca2501.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: HEUR.Trojan.Win32.Generic
Vulnerability: Insecure Permissions
Description: The malware creates an dir with insecure permissions under c:\ drive and grants change (C) permissions to the authenticated user group. Standard users can rename the executable 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: a6916fb9b824e3d2edfe46be69ca2501
Vuln ID: MVID-2021-0338
Dropped files: B6232F3A578.exe, 44160A754B496CC
Disclosure: 09/09/2021


Exploit/PoC:
C:\>cacls Recycle.Bin
C:\Recycle.Bin 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:\>cd Recycle.Bin

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

 Directory of C:\Recycle.Bin

09/01/2021  02:05 AM             9,004 44160A754B496CC
02/10/2018  01:21 AM           204,800 B6232F3A578.exe

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