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Tomorrow, on April Fool's Day, the virus is programmed to check a randomly generated number of websites for 'instructions' on what the infected computers should do next.
If they were told to simultaneously connect to a single website, the network of infected 'robot computers' known as Botnets could knock it offline by deluging it with hits.
Botnets have been used in the past to generate millions of pieces of spam email and to blackmail websites by threatening to temporarily knock them out.
Experts fear that the bug could be programmed to trigger an attack on the internet - rendering email, banking and other systems unusable.
It would do this by simultaneously sending a massive numbers of search queries or generating millions of pieces of spam email to knock websites offline through the sheer weight of connections.
Experts admitted today they do not know what will happen. Graham Cluley of internet security firm Sophos said: 'The system could turn into a network of 'zombie' PCs used to send email, or attack other websites. It may also be that nothing happens.'
Mikko Hypponen, of antivirus software firm F-Secure, said: 'It is scary thinking about how much control a hacker could have. They would have access to millions of machines.'
Microsoft has offered users free software to remove the worm, and even offered a $250,000 reward for anyone who reveals its writers.
But Ed Gibson, Microsoft's chief security adviser for the UK, said: '1 April is a classic date for anything like this to go off. But I would hate to say it is going to be unlike any other day.'
PC users can protect against Conficker by ensuring their computer is up to date with the latest free security software from www.microsoft.com, updating antivirus software, and not opening unfamiliar email attachments.
source : microsoft.com
And the aggressive bug could be hiding on your PC at home right now, waiting to kick in.
For the hackers, it’s like having a virtual army at their fingertips.
The criminals behind it have the power to launch a tidal wave of junk emails, bringing computers grinding to a halt.
They could also plunder information, including your bank details.
But the truth is that the best techie brains in the business just don’t know exactly what the hackers have in mind.
Virus expert Mikko Hypponen, from the firm F-Secure, said: “It is scary thinking about how much control a hacker could have over all these computers. They would have access to millions of machines.”
Microsoft, who developed the Windows computer operating system, have slapped a £175,000 bounty on whoever is responsible, so far without success.
The sophisticated Conficker bug — also known as Downadup or Kido — targets systems via the web and can be spread on memory sticks.
More than nine million computers were infected at the bug’s peak last month.
And if Conficker is still on your system come Wednesday, you could be in trouble.
Once inside your PC, it sets up files and starts downloading information from a controlling “boss” server.
Finding that website and the mastermind behind it all is like looking for a needle in a haystack.
That is because the bug creates hundreds of bogus addresses every day to put investigators off the scent.
The infected PCs then form a network and “talk” to each other, updating and evolving.
The bug even attacks anti-virus software and other files on your computer to strengthen its position.
And it resets “restore” points, making recovery of your old system even harder.
The first of three Conficker strains was discovered in November last year.
A second, more aggressive strain followed in December and a third this month. This contains the all-important April 1 trigger.
Dubbed Windows Azure, it's less a replacement for the operating system that runs on one's own PC than it is an alternative for developers, intended to let them write programs that live inside Microsoft's data centers as opposed to on the servers of a given business.
"It's a transformation of our software and a transformation of our strategy," said Ray Ozzie, a computing industry pioneer who now serves as Microsoft's chief software architect.