The 6 biggest ransomware attacks of the last 5 years

The biggest ransomware attacks illustrate how this particularly nasty genre of attack software has grown from a curiosity and an annoyance to a major crisis. Malware that holds data for ransom has been around for years. In 1991, a biologist spread PC Cyborg, the first ever ransomware, by sending floppy disks via surface mail to other AIDS researchers, for instance.

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