The most damaging worm to hit the world in 18 months likely originated from a Chinese hacking group, according to South Korean authorities. South Korea was the worst hit by the Slammer Worm, with almost the whole country going offline.
It is thought that the worm will continue on its way until the proper patches have been developed and applied. Security experts have also said that this worm was built to infiltrate networks very quickly.
The worm spread around the world on the weekend, causing global havoc. http://www.smh.com.au/articles/2003/01/28/1043534058663.html