The IP 191.96.249.212 was blocked because it is associated with malware identified as a keylogger known as Agent Tesla.
Agent Tesla is a commercial keylogger that can be abused to monitor the keystrokes on a system and take screenshots. The IP 191.96.249.212 hosts a webpanel for this keylogger.
Malwarebytes blocks the IP 191.96.249.212 because it is associated with malware.