Conficker virus could be deadly threat – or April Fool’s joke

Virus that has infected 10m computers leaves experts baffled It could be the biggest April Fool's joke ever played on the internet, or it could be one of the worst days ever for computers connected to the network. Security experts can't work out whether the Conficker virus – which has infected more than 10m Windows PCs worldwide – will wreak havoc on Wednesday , or just let the day pass quietly. Experts have worked out that from midnight on 1 April, the Conficker program will start scanning thousands of websites for a new set of instructions telling it what to do next. The infected machines thus comprise one of the biggest "botnets" – a network of "robot" computers – in internet history. And if they were all given a target, such as simultaneously sending search queries to Google or trying to connect to a gambling site, they could knock it offline through the sheer volume of connections – a "denial of service". Victims usually discover that they have been locked out of their computers or have very slow-running internet connections. Botnets have been used in the past to generate millions of pieces of spam email and to blackmail gambling sites that need to stay online during sports events with the threat that they will be deluged by a "denial of service" attacks. Careful study of infected machines has revealed that from midnight on Wednesday they will seek new instructions from a randomly generated list of thousands of websites that changes every day. Just one needs to be under the virus writers' control to turn Conficker into a newly configured botnet – making the task of catching the exact site a search for a needle in a computing haystack. Experts admit that they have little idea of where Conficker might be headed next

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Conficker virus could be deadly threat – or April Fool's joke