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Clickbot.A
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<p>Clickbot.A is a <a href="/facts/Botnet/bGspY7bJ">botnet</a> that is used for <a href="/facts/Click_fraud/suboHSvE">click fraud</a>. </p><p>The bot was first discovered by Swa Frantzen at <a href="/facts/SANS_Institute/BY9sjgow">SANS</a>' <a href="/facts/Internet_Storm_Center/06HL9LRd">Internet Storm Center</a> in May 2006. At that time, the botnet had infected about 100 machines. The infected population grew to over 100,000 machines within one month. </p><p>The bot was written as a plugin to <a href="/facts/Internet_Explorer/uL8a4Y5l">Internet Explorer</a> that was downloaded by IE users. It operated by using victims' computers to automatically click on <a href="/facts/Pay_per_click/yBnzc4Mc">pay-per-click</a> <a href="/facts/Online_advertising/Ncsv0GRz">Internet advertisements</a>. </p><p>It is also used to steal passwords from unsuspecting users. </p>