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Legitimate sites serving up stealthy attacks

Thousands of legitimate Web sites are hosting an infection kit that evades detection by attempting to compromise each visitor only once and using a different file name each time, Web security firm Finjan warned on Monday.

The attack, dubbed the "Random JS toolkit" by the security firm, currently uses dozens of hosting servers and more than 10,000 legitimate domains to attempt to exploit the systems of visitors to the sites, the company said in an analysis posted to its Web site.

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