LOIC

[fiveworlds]

Low Orbit Ion Cannon (LOIC) is an open source network stress testing and denial-of-service attack application, written in C#.

 

http://en.wikipedia.org/wiki/Low_Orbit_Ion_Cannon

Notable uses Project Chanology and Operation Payback

LOIC was used by Anonymous during Project Chanology to attack websites from the Church of Scientology,^[9] once more to (successfully) attack the Recording Industry Association of America's website in October 2010,^[10] and again during Operation Payback in December 2010 to attack the websites of companies and organizations that opposed WikiLeaks.^[11][12]

 

 

It wasn't used for anything all the script does is count up in a gui. Though why this appears as malware and not "silly toy" is beyond me