The attacks blocked doctors' access to patient files and forced emergency rooms to divert people seeking urgent care.
"The National Cyber Security Centre is working closely with NHS digital to ensure that they support the organizations concerned and that they protect patient safety", she continued.
"The investigation is at an early stage but we believe the malware variant is Wanna Decryptor", NHS Digital said in a statement. However, NHS Digital, which runs the services' cyber security, said they were not specifically the target of the attack. We're not confirming where they are, but there was a limited impact. Hospital staff then hd to resort to using pens and paper.
Pictures posted on social media showed screens of NHS computers with images demanding payment of 300 U.S. dollars worth of the online currency Bitcoin, saying: "Ooops, your files have been encrypted!" "But we will continue to communicate with NHS colleagues and will share more information as it becomes available".
May has now said that the United Kingdom government does not believe the NHS was the intended target of the attack.
In addition, several Spanish companies had also been affected via a ransomware attack.
Hospitals and clinical commissioning groups (CCGs) in London, Blackpool, Hertfordshire and Derbyshire were among those to report problems.
In Scotland, NHS Greater Glasgow and Clyde, NHS Dumfries and Galloway and NHS Forth Valley said some of their GP surgeries have been caught up in the incident.
NHS services from Barts in London to Liverpool say they are affected.
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In Spain, the attacks did not disrupt the provision of services or network operations, the government said in a statement. Patients are asked for understanding whilst the issue is resolved.
British government officials and intelligence chiefs have repeatedly highlighted the threat to critical infrastructure and the economy from cyberattacks.
A year ago the Government established the NCSC to spearhead the country's defences. The National Cyber Security Centre said it had detected 188 "high-level" attacks in just three months.
The attack on the National Health Service seemed perhaps the most audacious of the attacks, because it had life-or-death implications for hospitals and ambulance services. It exploits vulnerability in Microsoft's Windows operating system that allows it to automatically spread across networks, which gives it the ability to quickly infect large numbers of machines at the same organisation.
NHS hospitals across England have been hit with what looks to be a cyberattack with the motivation of extortion.
Hackers exploiting data stolen from the US government conducted extensive cyberattacks on Friday that hit dozens of countries around the world, severely disrupting Britain's public health system and wreaking havoc on tens of thousands of computers elsewhere, including Russia's ministry for internal security.
Hospitals across England reported the attack was causing huge problems to their services. The ministry, which oversees Russia's police forces, said technicians had stopped the attack and were updating the department's "anti-virus defense systems".
Microsoft has already patched the vulnerability, but only for newer Windows systems. "We regret any inconvenience to our customers".
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