Microsoft's offering a $250,000 reward for information leading to a successful criminal conviction for the Rustock botnet.
Microsoft's recent take-down of the Rustock botnet saw spam levels drop by a third during March, according to Symantec unit MessageLabs.
Unknown cyber activists have managed to temporarily down the nefarious spam-spewing Rustock botnet.
Oh well, it was nice while it lasted. But, as feared, the Rustock botnet is back, heralding the arrival of millions more spam emails pushing Viagra and penis extension.