The malware used in the huge NHS hack is now spreading across the world.

The problems are hitting people and companies across Europe and Asia, according to experts.

The ransomware – which locks down files until money is paid – is a new version that is rapidly spreading across the world. It is known as Wanna Decryptor.

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Though the problem has become most famous for the damage it has done to NHS systems, the effects have focused most specifically on Spain and Russia, according to experts.

“This cyber attack is much larger than just the NHS," said Travis Farral, director of security strategy for cyber security firm Anomali Labs. "It appears to be a giant campaign that has hit Spain and Russia the hardest."

Some people are already paying to get their files back, Mr Farral said.

Wanna Decryptor, the malware that is being used, has been known to cyber security experts for weeks. But the version spreading across the internet has just been updated, according to reports.

"The ransomware used in this attack is relatively new - it was first seen in February 2017, and the latest variant emerged earlier today," said Aatish Pattni from cyber security firm Check Point.

"Even so, it's spreading fast, with organisations across Europe and Asia being hit.

"It shows just how damaging ransomware can be - and how quickly it can cause disruption to vital services.

"Organisations need to be able to prevent infections taking hold in the first place, by scanning for, blocking and filtering out suspicious files content before it reaches their networks.