Backdoor.Win32.Prorat.cwx Insecure Permissions

`Discovery / credits: Malvuln - malvuln.com (c) 2022  
Original source: https://malvuln.com/advisory/2d81bf2c55c81778533b55fb444d4dc6.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
Threat: Backdoor.Win32.Prorat.cwx  
Vulnerability: Insecure Permissions  
Description: The malware writes a ".EXE" file with insecure permissions 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: Prorat  
Type: PE32  
MD5: 2d81bf2c55c81778533b55fb444d4dc6  
Vuln ID: MVID-2022-0545  
Disclosure: 04/14/2022  
  
Exploit/PoC:  
C:\>cacls a.exe  
C:\a.exe BUILTIN\Administrators:(ID)F  
NT AUTHORITY\SYSTEM:(ID)F  
BUILTIN\Users:(ID)R  
NT AUTHORITY\Authenticated Users:(ID)C  
  
C:\dump>dir /a \a.exe  
Volume in drive C has no label.  
  
Directory of C:\  
  
04/08/2022 02:31 AM 368,609 a.exe  
1 File(s) 368,609 bytes  
  
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