WASHINGTON: ZeroAccess, one of the world’s largest botnets - a network of computers infected with malware to trigger online fraud - has been disrupted by Microsoft and law enforcement agencies. ZeroAccess hijacks web search results and redirects users to potentially dangerous sites to steal their details. It also generates fraudulent ad clicks on infected computers then claims payouts from duped advertisers.

Also called Sirefef botnet, ZeroAccess, has infected two million computers. The botnet targets search results on Google, Bing and Yahoo search engines and is estimated to cost online advertisers $2.7m (£1.7m) per month.–BBC