Run a CMD.EXE process as administrator and run NETSTAT -b to find out what process on your PC has that address and port open. That should hopefully reveal more.
A description of your network and network security would help.
Personally, if you think your network/pc may have been tampered with, I would change the password on your router, change your wifi password to something strong and reformat windows.
Make sure you have your firewall turned on on the router if it has one and that you have a firewall running on windows as well as antivirus of course.
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