Trojan-Downloader.Win32.FraudLoad.xevn Insecure Permissions

`Discovery / credits: Malvuln - malvuln.com (c) 2021  
Original source: https://malvuln.com/advisory/17da6737cb94c11fa2363772d8eac0b1.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
Threat: Trojan-Downloader.Win32.FraudLoad.xevn  
Vulnerability: Insecure Permissions  
Description: FraudLoad.xevn creates an insecure dir named "usxxxxxxxx.exe" 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: 17da6737cb94c11fa2363772d8eac0b1  
Vuln ID: MVID-2021-0161  
Dropped files: config.bin, usxxxxxxxx.exe  
Disclosure: 04/05/2021  
  
  
Exploit/PoC:  
C:\>cacls usxxxxxxxx.exe  
C:\usxxxxxxxx.exe 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 usxxxxxxxx.exe  
  
C:\usxxxxxxxx.exe>dir  
Volume in drive C has no label.  
  
Directory of C:\usxxxxxxxx.exe  
  
02/10/2018 01:21 AM 146,014 config.bin  
02/10/2018 01:21 AM 296,960 usxxxxxxxx.exe  
2 File(s) 442,974 bytes  
  
  
Disclaimer: The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information or exploits by the author or elsewhere. Do not attempt to download Malware samples. The author of this website takes no responsibility for any kind of damages occurring from improper Malware handling or the downloading of ANY Malware mentioned on this website or elsewhere. All content Copyright (c) Malvuln.com (TM).  
`