Builder XtremeRAT 3.7 MVID-2022-0623 Insecure Permissions

`Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022  
Original source: https://malvuln.com/advisory/7f314e798c150aedd9ce41ed39318f65.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
Threat: Builder XtremeRAT v3.7  
Vulnerability: Insecure Permissions  
Description: The malware builds and writes a PE file to 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.   
Family: Xtreme  
Type: PE32  
MD5: 7f314e798c150aedd9ce41ed39318f65  
Vuln ID: MVID-2022-0623  
Disclosure: 07/15/2022  
  
Exploit/PoC:  
C:\>cacls server.exe  
C:\server.exe BUILTIN\Administrators:(ID)F  
NT AUTHORITY\SYSTEM:(ID)F  
BUILTIN\Users:(ID)R  
NT AUTHORITY\Authenticated Users:(ID)C  
  
  
C:\>dir server.exe  
Volume in drive C has no label.  
  
Directory of C:\  
  
03/04/2022 02:56 AM 21,504 server.exe  
1 File(s) 21,504 bytes  
0 Dir(s) 26,072,932,352 bytes free  
  
  
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