[erdos4d]

Maybe I misunderstood what you wrote, but you feel the traffic is actually originating from your desktop? I am completely unaware how someone could get 2 IP addresses for your desktop without that showing up somewhere on the box (agreed, you should have found it with the tools you ran). I still think wipe and wait, but this seems like you got seriously hacked. Good luck.

[wasipwned]

I probably am mistaken that it's originating from my desktop. It is entirely possible that it is multicast traffic I am seeing.

See https://news.ycombinator.com/item?id=33821387