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 40.121.49.138 on port 8023 TCP:
$ telnet 40.121.49.138 8023
Trying 40.121.49.138…
Connected to 40.121.49.138.
Escape character is ‘^]’
Referencing malware samples:
MD5 d1e6f13e10903ba40e0dd32738370cca