Tanatos/Bugbear: A 2002 keylogger virus that targeted financial institutions and spread to 150 countries.Storm Worm: This worm showed up in 2007 and attacked millions of computers with an email about approaching bad weather.Its financial cost has been pegged at $10.4 billion, but not reliably. Swen: Written in C++, the Swen computer worm disguised itself to look like a 2003 OS update.Yaha: Yet another worm with several variants, thought to be the result of a cyber-war between Pakistan and India.Mimail: This worm tried to harvest data from infected machines to launch a string of DDoS attacks, but was relatively easy to remove.
