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## https://sploitus.com/exploit?id=PACKETSTORM:164391
Discovery / credits: Malvuln - malvuln.com (c) 2021  
Original source: https://malvuln.com/advisory/001fc372acc853aa1cf92588a43a7deb.txt  
Contact: malvuln13@gmail.com  
Media: twitter.com/malvuln  
  
Threat: Virus.Win32.Renamer.a  
Vulnerability: Insecure Permissions  
Description: The malware creates an dir with insecure permissions under c:\ drive granting 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: 001fc372acc853aa1cf92588a43a7deb   
Vuln ID: MVID-2021-0352  
Dropped files: GUESSNUM.EXE  
Disclosure: 10/04/2021  
  
  
Exploit/PoC:  
C:\>cacls "RECYCLER.{645FF040-5081-101B-9F08-00AA002F954E}"  
C:\RECYCLER.{645FF040-5081-101B-9F08-00AA002F954E} 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 /a "RECYCLER.{645FF040-5081-101B-9F08-00AA002F954E}"  
Volume in drive C has no label.  
  
Directory of C:\RECYCLER.{645FF040-5081-101B-9F08-00AA002F954E}  
  
06/17/2012 06:06 AM 818,211 GUESSNUM.EXE  
1 File(s) 818,211 bytes  
  
  
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