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Employees at a store in Kiev, Ukraine, read a ransomware demand for $300 in bitcoin to free files encrypted by the Petya software virus. The malicious program has spread to dozens of countries. Vincent Mundy/Bloomberg via Getty Images hide caption

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Vincent Mundy/Bloomberg via Getty Images

'Petya' Ransomware Hits At Least 65 Countries; Microsoft Traces It To Tax Software

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A message demanding money is seen on a terminal monitor at a branch of Ukraine's state-owned Oschadbank after Ukrainian institutions were hit by a wave of cyberattacks earlier Tuesday in Kiev, Ukraine. Valentyn Ogirenko/Reuters hide caption

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Valentyn Ogirenko/Reuters