I was affected by this about 2 weeks ago. I woke to find my 9 hour modem connection had sent about 70Mb of data !! I ran a netstat and my machine had port 80 sessions with about 30 machines from all walks of life...
A reboot did the job, and as a precaution I stopped all IIS services until I applied the patch.
Some people just have nothing better to do with their lives....