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 13.66.153.98 on port 1604 TCP:
$ telnet 13.66.153.98 1604
Trying 13.66.153.98…
Connected to 13.66.153.98.
Escape character is ‘^]’
Referencing malware samples (MD5 hash):
ac298960b0c5081f61cf119189c2c722 — AV detection: 34 / 68 (50.00%)