Security experts have warned that another attack is imminent, most likely on Monday, and could be unstoppable.
Cyber security experts in the National Health Service (NHS) worked alongside the National Cyber Security Centre (NCSC), part of the GCHQ spy agency, to patch computer systems after the attack caused widespread problems on Friday, Wallace said.
Digital recently confirmed that the recent NHS cyber attack used the Wanna Decryptor ransomware to infect the systems of at least 24 United Kingdom trusts.
"We've never seen anything like this", the head of the European Union's policing agency told Britain's ITV television, calling its reach "unprecedented".
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There are a number of tools publicly available to limit the spread and the impact of further cyber security attacks. According to the BBC, the virus took hacked users' files and demanded payments to restore access.
Over 200,000 infections in at least 150 countries have been recorded, including one in a system in a voluntary run healthcare facility in Wexford, which has been isolated.
While urging users to pay more attention to their security update, he urged government to store such security information better to avoid situations where weapons systems could be hacked.
Oxford University Hospitals NHS Foundation Trust said it has not been affected by the attack but Oxford University Hospitals NHS Foundation Trust communications manager Roy Probert said the trust is still remaining vigilant.
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The Hampshire Hospitals NHS Trust statement said that emergency services were continuing as normal and any patient with an appointment should attend as expected, unless specifically contacted by the hospital.
The UK National Health Service was among those hardest hit, with officials estimating that as many as 70,000 different devices may have been impacted - including vital health care equipment like blood-storage refrigerators, MRI scanners, and critical computer systems.
"Most people are not paying this, so there are not a lot of money being made with this by criminal organisations so far", he said.
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