181222 hacker 2
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Ransomware gang REvil has demanded that software provider Kaseya pay $70 million in bitcoin to release information locked in a hack on between 800 and 1,500 businesses worldwide.

Ransomware is malicious code that uses encryption to perpetually block an organisation’s critical data in the hope of extorting a hefty ransom. A growing preference for “double-extortion” attacks sees hackers downloading data before encryption then threatening the victim with public exposure of their stolen data.

Infographics: Recent worldwide ransomware attacks
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