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 137.116.87.64 on port 8400 TCP:
$ telnet 137.116.87.64 8400
Trying 137.116.87.64…
Connected to 137.116.87.64.
Escape character is ‘^]’
Referencing malware samples (MD5 hash):
12807424051407b73ed5afbc3eb5081a — AV detection: 41 / 71 (57.75%)