A spectre is haunting the net but, outside of techie circles, nobody seems to be talking about it. The threat it represents to our security and wellbeing may be less dramatic than anything posed by global terrorism, but it has the potential to wreak much more havoc. And so far, nobody has come up with a good idea on how to counter it.

It’s called the Storm worm. It first appeared at the beginning of the year, hidden in email attachments with the subject line: ‘230 dead as storm batters Europe’. The PC of anyone who opened the attachment became infected and was secretly enrolled in an ever-growing network of compromised machines called a ‘botnet’. The term ‘bot’ is a derivation of ‘software robot’, which is another way of saying that an infected machine effectively becomes the obedient slave of its – illicit – owner. If your PC is compromised in this way then, while you may own the machine, someone else controls it. And they can use it to send spam, to participate in distributed denial-of-service attacks on banks, e-commerce or government websites, or for other even more sinister purposes.

This is for computers who are not legal computers. They aren’t being updated by Microsoft. Some hackers are using several Zero Day exploits.