Two years ago today, a powerful ransomware began spreading across the world.

WannaCry spread like wildfire, encrypting hundreds of thousands of computers in over 150 countries in a matter of hours. It was the first time that ransomware, a malware that encrypts a user’s files and demands cryptocurrency in ransom to unlock them, had spread across the world in what looked like a coordinated cyberattack.

Hospitals across the U.K. declared a “major incident” after they were knocked offline by the malware. Government systems, railway networks and private companies were also hit.

Security researchers quickly realized the malware was spreading like a computer worm, across computers and over the network, using the Windows SMB protocol. Suspicion soon fell on a batch of highly classified hacking tools

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