A malware strain at the center of this week’s global attack that crippled networks in multiple countries was not ransomware as first suspected, but rather a “wiper” that encrypts data and makes it unrecoverable, top cyber security experts now say. The alarming revelation means the hacker campaign that struck Europe, the U.S., France, Italy, Germany and elsewhere since Monday, was merely posing as a ransomware attack and is actually intended to destroy target files.

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