Backdoor.Win32.Spirit.12.b Insecure Permissions

`Discovery / credits: Malvuln - malvuln.com (c) 2021  
Original source: https://malvuln.com/advisory/2bcd471d9dd0a8d6194f4112c2ee520f.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
Threat: Backdoor.Win32.Spirit.12.b  
Vulnerability: Insecure Permissions  
Description: Trojan Spirit 2001a 1.2 Fixed Edition by ThundeR GoD, creates an insecure dir named "Ts2k1a" 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: 2bcd471d9dd0a8d6194f4112c2ee520f  
Vuln ID: MVID-2021-0223  
Dropped files: client 1.2.exe, ip-check 1.2.exe, server 1.2.exe  
Disclosure: 05/23/2021  
  
Exploit/PoC:  
C:\>dir \Ts2k1a  
Volume in drive C has no label.  
  
Directory of C:\Ts2k1a  
  
05/12/2021 02:55 AM 257,024 client 1.2.exe  
05/12/2021 02:55 AM 146,432 ip-check 1.2.exe  
05/12/2021 02:55 AM 241,664 server 1.2.exe  
3 File(s) 645,120 bytes  
  
C:\>cacls Ts2k1a  
C:\Ts2k1a 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  
  
  
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