Backdoor.Win32.Kraimer.11 Missing Authentication

Backdoor.Win32.Kraimer.11 malware has a backdoor on TCP/6668 that does not require any authentication.

MD5 | ab7914a32014a552e8902d32415b1aed

Discovery / credits: Malvuln - (c) 2021
Original source:
Contact: [email protected]

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


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