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Experts say federal agencies have taken steps to secure networks, but they remain vulnerable.
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Google security researcher Neel Mehta pointed out similarities between WannaCry and malware used by Lazarus, the group that has been blamed for the Sony Pictures hack of 2014.
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There's very little law enforcement can do to catch purveyors of ransomware — unless they slip up. The criminals behind the WannaCry attack may have done just that.
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Microsoft President Brad Smith calls for a "Digital Geneva Convention" under which governments would set limits on the creation of cyberweapons, just like they did for nuclear weapons.
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The NSA's losing control of the software behind the WannaCry cyberattack is like "the U.S. military having some of its Tomahawk missiles stolen," Microsoft President Brad Smith says.