May 15, 2017 7:02 p.m. ET
At least 150 countries are still working to contain a malicious computer worm that emerged on Friday. The unprecedented planet-wide attack is another harbinger of the world’s exposure to hackers and digital terrorists.
From London to Beijing to Moscow, hundreds of thousands of users were infected with a new variant of so-called ransomware, known as “WannaCry,” which encrypted their data and then solicited a blackmail payment to resume normal operations. This sophisticated, self-propagating malware was designed to spread to all other computers on the same network after infecting one machine. The culprits are unknown and could take years to track down, if ever.
WannaCry has renewed a debate about the obligations of defense departments to the private sector. The virus was developed by taking advantage of a software flaw in…
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