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 137.184.6.37 on port 7121 TCP:
$ telnet 137.184.6.37 7121
Trying 137.184.6.37…
Connected to 137.184.6.37.
Escape character is ‘^]’
Referencing malware samples:
MD5 c5c9afb0a28b09453c8460d20db26159