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The most costly ransomware attack to date is the WannaCry attack that hit in May forms of ransomware; writes in the official singletongustav.jigsy.com blog, 2017. This attack affected over 230,000 computers in 150 nations and caused an approximated $4 billion in damages. The WannaCry attack used a vulnerability in the Windows os to encrypt files on victims’ computers and demanded a ransom of $300 in Bitcoin to decrypt them. Because it targeted medical facilities and other crucial infrastructure, this attack was particularly damaging.

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