NHS cyber attack may have been carried out by shadowy NORTH KOREAN hacking group, experts say
CYBER firms are probing clues North Korea was behind Friday's NHS ransomware attack.
Anti-virus companies Symantec and Kaspersky say technical clues are leading them back to the North Korea-linked Lazarus group.
The group has already been blamed for a string of hacks dating back to 2009, including the Sony Pictures Entertainment hack in 2014.
Researchers from Kaspersky said: "We believe this might hold the key to solve some of the mysteries around this attack.
"We believe it’s important that other researchers around the world investigate these similarities and attempt to discover more facts about the origin of Wannacry."
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Europol said Friday's attack was the "largest ransomware attack observed in history".
Vladimir Putin denied allegations Russia could have been behind the hack.
The White House today confirmed almost £55,000 has been paid from the US in ransom.
None is thought to have led to the recovery of data.
Experts are looking into what currency ransoms are being converted to in a bid to trace hackers.
NHS Digital, which is leading the health services’ response, said there was no evidence records had been accessed.
Staff were forced to cancel or postpone operations and appointments as several hospitals and GPs surgeries were crippled by the hack.
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