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 5.189.186.155 on port 7878 TCP:
$ telnet 5.189.186.155 7878
Trying 5.189.186.155…
Connected to 5.189.186.155.
Escape character is ‘^]’
$ nslookup 5.189.186.155
vmi683611.contaboserver.net
$ dig +short n.myvnc.com
5.189.186.155
Referencing malware samples:
MD5 81e224bf7c429777f84461481bd52c48