You're talking about SQL Slammer. The whole virus fit in a single UDP packet. Wired had a pretty good (if slightly sensational) writeup at the time: http://w

You're talking about SQL Slammer. The whole virus fit in a single UDP packet. Wired had a pretty good (if slightly sensational) writeup at the time: http://www.wired.com/wired/archive/11.07/slammer.html http://www.wired.com/wired/archive/11.07/slammer.html