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Date: Tue, 4 May 2021 22:22:07 -0400
From: malvuln <>
Subject: [FD] Backdoor.Win32.NinjaSpy.c / Remote Command Execution

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

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

1) Enter "666" after the 9951, this opens port 999.

nc64.exe 2003

2) Connect port 999

nc64.exe 999

Disclaimer: The information contained within this advisory is supplied
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Permission is hereby granted for the redistribution of this advisory,
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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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