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The most costly ransomware attack to date is the WannaCry attack that hit in May different Types Of Ransomware 2017.
This attack affected over 230,000 computers in 150 nations and triggered an approximated $4 billion in damages. The WannaCry attack used a vulnerability in the Windows os to secure files on victims’ computers and types of ransomware attacks (folkd.com) demanded a ransom of $300 in Bitcoin to decrypt them.
This attack was especially harmful because it targeted healthcare facilities and other critical facilities.