A ransomware attack hit computers across the world on Tuesday, taking out servers at Russia's biggest oil company, disrupting operations at Ukrainian banks, and shutting down computers at multinational shipping and advertising firms.
"It's like WannaCry all over again," said Mikko Hypponen, chief research officer with Helsinki-based cyber security firm F-Secure.
He said he expected the outbreak to spread in the Americas as workers turned on vulnerable machines, allowing the virus to attack. "This could hit the U.S.A. pretty bad," he said.
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