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"A new version of the malware that crippled Windows PCs last February sidesteps safeguards designed to block rootkits from hijacking machines running 64-bit editions of Windows, researchers said Thursday.'A new era has officially dawned: the era of x64 rootkits,' said Prevx researcher Marco Giuliani in a post to the security vendor's blog yesterday."
Rootkit with Blue Screen history now targets 64-bit Windows>>