Disrupted operations: It’s been three years since WannaCry spread across the globe in a massive attack that took down roughly 200,000 devices in a couple of days. Roughly one-third of the NHS Trusts in the United Kingdom were affected, delaying healthcare to 19,000 patients. Microsoft released the MS17-010 patch to mitigate this ransomware, but as of 2019, WannaCry was still attacking about 3,500 systems per hour.