A zero-day flaw in the ubiquitous Microsoft Word software program is being used in an active exploit by sophisticated hackers in China and Taiwan, according to warnings from anti-virus researchers reported in eWeek magazine. “The exploit arrives as an ordinary Microsoft Word document attachment to an e-mail. However, when the document is launched by the user the vulnerability is triggered to drop a backdoor with rootkit features to mask itself from anti-virus scanners.”

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