The Hows and whys of wanna cry

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      <subfield code="a">On May 12, 2017, major companies around the world walked into their offices to discover a message on their computers. Their files had been encrypted, the message said, and in order to retrieve their data, the companies would need to pay $300 to the attackers. This was the beginning of the WannaCry cyberattack.</subfield>
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