In Brief

The London Stock Exchange and Autotrader were just a few of the websites infected by a recent wave of virus-infected advertising.

A number of websites have recently been affected by cyber criminals who have planted a batch of fake advertisements, or ‘malvertising’, that infect computers with viruses. The ads, which are apparently very common, typically exploit vulnerabilities in Windows and in programs such as Adobe and Java. It is unclear how the criminals gained access to Unanimis, the ad firm site that was affected on Sunday. Although the infection was caught and removed quickly, the malicious ads appeared on sites such as the London Stock Exchange and Autotrader and potentially affected thousands of visitors.

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