I remember watching a film on JustinTV in the middle of the night. The premise was a small (silver?) box drops from the sky in a swamp in some rural town and people start getting sick and turning into zombies. Scenes with hiding in barns and shooting zombies. I remember a scene where a couple went into a truck stop and the zombies were attacking. I saw the movie probably 3-5 years ago and I was half asleep so its a bit grainy to me. Anybody know this flicks name?