Google on Tuesday hauled out a tool it last used nearly a year ago to warn users infected with the "DNSChanger" malware.
Starting Tuesday, special messages will be displayed at the top of a Google search results page to people whose Windows PCs and Macs have been infected with malicious code that hijacks their clicks.
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Google Warns Users Infected with DNSChanger as 'Internet Doomsday' Nears | PCWorld