Researcher Sergey Golovanov has warned that a botnet named TDL-4, but also known as TDSS and Alureon, is "the most sophisticated threat today".
A botnet is a network of home computers that have been infected by a virus that allows a hi-tech criminal to use them remotely. Often botnet controllers steal data from victims' PCs or use the machines to send out spam or carry out other attacks.
TDL-4 is thought to have infected 4.5 million PC's, 5% of which are in the UK.
On the Kaspersky
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