A study, conducted by researchers at F-Secure, shows that the W32.Downadup worm has infected almost 2.4 million computers around the world and they think that is a conservative number. Yikes.
However, the bad guys only need to predetermine one possible domain for tomorrow, register it, and set up a website and they then gain access to all of the infected machines. Pretty clever. But we can play this game as well. So we've determined the possible domains and have registered some of them for ourselves. Which means the infected machines will also connect to us.