Discovery / credits: Malvuln - (c) 2021  
Original source:  
Threat: Backdoor.Win32.Kraimer.11  
Vulnerability: Missing Authentication   
Description: Kraimer listens for commands on TCP port 6668, due to a lack of authentication anyone can telnet to the infected host. Seems only one established connection at a time is allowed, so if you telnet in then no other connections are honored. Therefore, if you make TCP connection and theres already an established connection you will get refused.  
Successful backdoor logon:  
::KrAIMer 1.1::   
1) Help   
2) View Log File   
3) Start Key Logging   
4) Stop Key Logging   
5) Time/Date  
6) View Saved Passwords   
7) Reboot   
8) Quit   
Type: PE32  
MD5: 2a4fda4a6687981d32c2da7bdc1efcf1  
Vuln ID: MVID-2021-0046  
Disclosure: 01/22/2021  
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) (TM).