Backdoor.Win32.Vernet.axt Insecure Permissions

`Discovery / credits: Malvuln - malvuln.com (c) 2021  
Original source: https://malvuln.com/advisory/f529d60abbdafccce3dc5e5ffd6cdfa6.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
Threat: Backdoor.Win32.Vernet.axt  
Vulnerability: Insecure Permissions  
Description: The malware writes an .EXE 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: f529d60abbdafccce3dc5e5ffd6cdfa6  
Vuln ID: MVID-2021-0413  
Disclosure: 12/03/2021  
  
  
Exploit/PoC:  
C:\>cacls chikean.exe  
C:\chikean.exe BUILTIN\Administrators:(ID)F  
NT AUTHORITY\SYSTEM:(ID)F  
BUILTIN\Users:(ID)R  
NT AUTHORITY\Authenticated Users:(ID)C  
  
  
C:\>dir chikean.exe  
Volume in drive C has no label.  
  
Directory of C:\  
  
06/17/2012 01:43 AM 146,944 chikean.exe  
1 File(s) 146,944 bytes  
  
  
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