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 104.21.22.36 on port 443 TCP:
$ telnet 104.21.22.36 443
Trying 104.21.22.36…
Connected to 104.21.22.36.
Escape character is ‘^]’
guidereviews.bar 104.21.22.36
Referencing malware samples:
MD5 7c6d7053772bf801c08ad9f1f896e729
MD5 bb02bdfcada62e1d95a9e58f73faf7ac