LOIC is an open source network stress testing application, written in C#.It performs a distributed denial-of-service (DDoS) attack on a target site. The method is to flood the target site with TCP packets, UDP packets, or HTTP requests. This finally results in the disruption of the service to the host. An imaginary weapon in the Command & Conquer series of video games lends its name to the tool. Recording Industry Association of America's website, Scientology websites etc were the websites which were targeted by an anonymous group. The companies and organizations that opposed WikiLeaks were also attacked using this tool.



Near to 30,000 downloads of this tool has been reported from the site between 8 and 10 December 2010. The recipient of the attacks can log a Traceable IP address records. From this, the individual user conducting DDoS attacks can be identified. The LOICs javascript version is also been designed which can be run from the web browser itself.

How DDoS attack performed using LOIC application
Amazon, paypal, visa and master card and many similar companies banned wikileaks and these sites got attacked with Ddos attacks. Whenever a group of users use LOIC application by targeting a site by flooding the server with TCP packets, UDP packets, or HTTP requests the site will not respond properly and this is called denial-of-service.

For more details, see:
http://en.wikipediawiki/LOIC
http://tothetechtips-tricks/how-ddos-attack-performed-using-loic-application.html
http://whatthehack.livejournal2361.html