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A malicious program, dubbed QHosts, infects PCs using a recent flaw in Microsoft's Internet Explorer to take control of how computers look up Internet addresses, antivirus firms warned on Thursday.
The program takes advantage of a critical flaw in the popular Internet Explorer Web browser, which Microsoft has made an integral part of its Windows operating system. An "object type" vulnerability, the flaw allows a Web site to run code on a computer without authorization from the user.