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Date: Tue, 4 May 2021 22:22:07 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.NinjaSpy.c / Remote Command Execution

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/6eece319bc108576bd1f4a8364616264_B.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.NinjaSpy.c
Vulnerability: Remote Command Execution
Description: The malware listens on TCP ports 2003, 2004 and drops a DLL
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.
Type: PE32
MD5: 6eece319bc108576bd1f4a8364616264
Vuln ID: MVID-2021-0202
Dropped files: cmd.dll
Disclosure: 05/04/2021

Exploit/PoC:
1) Enter "666" after the 9951, this opens port 999.

nc64.exe 192.168.88.127 2003
9951666


2) Connect port 999

nc64.exe 192.168.88.127 999
C:\Users\Victim\Desktop>whoami
whoami
desktop-5c2jqhp\victim


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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