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.
Cyber security experts said those behind the attack appeared to have exploited the same type of
hacking tool used in the WannaCry ransomware attack that infected hundreds of thousands of computers
in May before a British researcher created a kill-switch.
"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.
The U.S. Department of Homeland Security said it was monitoring reports of cyber attacks around the
world and coordinating with other countries.
The first reports of organizations being hit emerged from Russia and Ukraine, but the impact quickly
spread westwards to computers in Romania, the Netherlands, Norway, and Britain.
Within hours, the attack had gone global.
Danish shipping giant A.P. Moller-Maersk, which handles one out of seven containers shipped globall
y,said the attack had caused outages at its computer systems across the world on Tuesday, including
at its terminal in Los Angeles.
Pharmaceutical company Merck & Co said its computer network had been affected by the global hack.
A Swiss government agency also reported computer systems were affected in India, though the countr
y's cyber security agency said it had yet to receive any reports of attacks.