The host at this IP address 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 at 5.9.224.220 on port 443.
$ telnet 5.9.224.220 443
Trying 5.9.224.220…
Connected to 5.9.224.220.
Escape character is ‘^]’
Malicious domains observed at this IP address:
endback.biz. 60 IN A 5.9.224.220