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## https://sploitus.com/exploit?id=PACKETSTORM:162062
Discovery / credits: Malvuln - malvuln.com (c) 2021  
Original source: https://malvuln.com/advisory/5b63a6e730f094d182c9030e3a57bcb8.txt  
Contact: malvuln13@gmail.com  
Media: twitter.com/malvuln  
  
Threat: Trojan-Downloader.Win32.Delf.ur  
Vulnerability: Insecure Permissions  
Description: Win32.Delf.ur creates an insecure dir named "Messenger" 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: 5b63a6e730f094d182c9030e3a57bcb8  
Vuln ID: MVID-2021-0155  
Dropped files: msn.DLL, msn.exe  
Disclosure: 04/01/2021  
  
  
Exploit/PoC:  
C:\>cacls Messenger  
C:\Messenger 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 Messenger  
Volume in drive C has no label.  
  
Directory of C:\Messenger  
  
03/30/2021 08:07 PM 25,600 msn.DLL  
06/16/2012 03:54 AM 62,464 msn.exe  
2 File(s) 88,064 bytes  
  
  
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