The Slammer worm
The Slammer computer worm caused major congestion on the internet last week. The worm represents a significant milestone in the evolution of computer worms. It was the fastest spreading worm yet, and remarkably small at only 376 bytes. For the first few minutes after its release, the number of infected computers doubled every 8.5 seconds. Its spread relies on unpatched SQL servers and port 1434, which is to say it only affects systems that aren't on the ball in terms of security.