A team from Ben Gurion University, working with Deutsche Telekom, has been able to track the source of botnets – illicit and secretive networks that have turned half a billion computers into zombies that try to crash websites, send out spam or run click fraud scams.

http://www.timesofisrael.com/the-death-of-spam-bgu-researchers-figure-out-path-to-botnets/