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 3.36.121.136 on port 4782 TCP:
$ telnet 3.36.121.136 4782
Trying 3.36.121.136…
Connected to 3.36.121.136.
Escape character is ‘^]’
$ nslookup 3.36.121.136
ec2-3-36-121-136.ap-northeast-2.compute.amazonaws.com
Referencing malware samples:
MD5 010eb448243fbab8334a1c528ec2e356