The host at this IP address is obviously operated by cybercriminals. It is running a malware botnet controller which is being used to control infected computers (bots) around the globe using a trojan horse.
Malware botnet controller located at 40.71.91.165 on port 1993 TCP:
$ telnet 40.71.91.165 1993
Trying 40.71.91.165…
Connected to 40.71.91.165.
Escape character is ‘^]’
Referencing malware samples:
MD5 4a695bb04914aad276b5fe98db0f32a3