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 18.189.143.187 on port 7777 TCP:
$ telnet 18.189.143.187 7777
Trying 18.189.143.187…
Connected to 18.189.143.187.
Escape character is ‘^]’
$ nslookup 18.189.143.187
ec2-18-189-143-187.us-east-2.compute.amazonaws.com
Referencing malware samples (MD5 hash):
d60fa60768b922b978f16b589a09a02d — AV detection: 56 / 68 (82.35%)