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 45.139.236.71 on port 44961 TCP:
$ telnet 45.139.236.71 44961
Trying 45.139.236.71…
Connected to 45.139.236.71.
Escape character is ‘^]’
Referencing malware samples (MD5 hash):
b07370fef540fb0968226a98d47a2ea4 — AV detection: 29 / 70 (41.43%)