That IP address 239.255.255.250 is a standard IPv4 address used for UPnP (Universal Plug and Play) to find devices on the network that can be automatically connected to like network printers and media servers.
You normally control UPnP access at your router. I always turn off UPnP because it has the potential to be misused by anyone on the Internet pretending to be on my network, i.e. spoofing.
You can read about it at Wikipedia:
And here is a detailed example of misuse:
P.S. From the info you provide, you don’t appear to have malware. Just an unwanted program that needs to be uninstalled.
That program is probably unrelated to that IP address 239.255.255.250.