Week past we have seen DDoS attack focussed on corporates which denied service to Wikileaks. The number of attackers increased rapidly from double digit to 4 digits. Credit goes to a open source tool which was modified to accomplise the desired results. Tool is java LOIC a Java port of Low Orbit Ion Cannon. The tool was basically designed to test a system imunity to attacks. The tool is exceptionally simple to use. There are just 2 important buttons on it - get orders & fire.
First, twitter ID is entered on the screen that has been communicated to person indulging in the attack and then click the "Get Orders" button and when ready click the "Fire!!" button. Other than that there isn't really that much to the application.
When the group gets enough persons doing it, the services of target entity goes down due to high request rate. The ease of usage really contributed to the proliferation of attack.
References:
http://isc.sans.edu/diary.html?storyid=10051&rss
http://mashable.com/2010/12/09/how-operation-payback-executes-its-attacks/
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