Cybersecurity experts braced for new wave of hacking victims

Here is the latest National Cyber Security Centre (NCSC) advice on the virus that took down computers across the world, including some NHS systems.

Any PC user can be a target, whether it is a home computer, endpoints in an enterprise network, or servers used by a government agency or healthcare provider.

The warning was echoed by Britain's National Cyber Security Centre: 'As a new working week begins it is likely, in the United Kingdom and elsewhere, that further cases of ransomware may come to light, possibly at a significant scale'.

"As a result, hospitals, businesses, governments, and computers at homes were affected".

Europol said Saturday that the attack was of an "unprecedented level and requires worldwide investigation".

The doctor who said hospitals could be vulnerable to ransomware one day before a virus struck the NHS has warned this could "just be the beginning".

It was stemmed by a young British researcher and an low-priced domain registration, with help from another 20-something security engineer in the U.S.

South Korea's government computer systems have not been affected by the crippling ransomware WannaCry, which hit hundreds of thousands of computers around the world last week, a government official said Monday.

MalwareTech, who wanted to remain anonymous, was hailed as an "accidental hero" after registering a domain name to track the spread of the virus, which actually ended up halting it.

Major global companies said they also came under attack.

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He said Russian Federation and India were hit particularly hard, largely because Microsoft's Windows XP - one of the operating systems most at risk - was still widely used there.

The Computer Emergency Response Team of India on Monday warned internet users against falling prey to an global ransomware virus known as "WannaCry" and issued a "critical alert".

Europol provides free decryption downloads for most ransomware already detected, though not yet for this particular attack.

The effects were felt across the globe, with Russia's Interior Ministry and companies including Spain's Telefonica, FedEx Corp.in the USA and French carmaker Renault all reporting disruptions.

Apple's Mac computers were not targeted by this ransomware attack.

Defence minister Michael Fallon told the BBC the government under Prime Minister Theresa May was spending around £50 million pounds on improving the computer systems in the NHS after warning the service that it needed to reduce its exposure to "the weakest system, the Windows XP".

High-profile victims include hospitals in Britain, the Spanish telecoms giant Telefonica, French carmaker Renault, US package delivery company FedEx, Russia's interior ministry and the German rail operator Deutsche Bahn. "They are processing a lot of sensitive data".

China's National Petroleum Corp said Monday that some petrol stations had been hit by the attack over the weekend.

"My hope is what it will lead to is more urgency and more focus from departmental and agency heads at the government level, from boardrooms at the business level and from individuals and families - of the need to make sure you're doing everything you can to keep yourselves cyber-secure".