I typically open a single port for torrents, and leave it alone. Upon coming back home from college however, I noticed that my family's network for opening ports is filled with randomly opened ports for ips in the network. I've closed the ports and opened ports for myself, but that is undone after some degree of time with a new set of opened ports. No one else in the family is doing it, and I've since taken security precautions. Previously, the network had no password, but I now changed the router password from default and I've added WPA-2 Personal password. However, the ports keep on opening (and overriding mine). I've asked the people in my family to run virus checks, although I'm not sure all of them have.
So, back to the question:
Could this be a virus or spyware?
I also found this term on wikipedia:
http://en.wikipedia.org/wiki/Firewall_pinholeCould that be related to my plight?
