Samy (also known as JS.Spacehero) is an XSS worm that was designed to propagate across the MySpace social-networking site written by Samy Kamkar. Within just 20 hours of its October 4, 2005 release, over one million users had run the payload making Samy the fastest spreading virus of all time.
The worm itself was relatively harmless, it carried a payload that would display the string "but most of all, samy is my hero" on a victim's MySpace profile page. When a user viewed that profile page, the payload would then be replicated and planted on their own profile page continuing the distribution of...