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 135.181.12.183 on port 45253 TCP:
$ telnet 135.181.12.183 45253
Trying 135.181.12.183…
Connected to 135.181.12.183.
Escape character is ‘^]’
Referencing malware samples (MD5 hash):
5d3a32b1f72b98e219f68cd36d9a3ddc — AV detection: 34 / 69 (49.28%)