Home Secretary Amber Rudd said most of the NHS systems were back to normal by midday on Saturday.
The attacks have led to hospitals and doctors in England turning away patients after they were unable to view their medical files. Portugal Telecom and Telefonica Argentina both said they were also targeted.
The attack held hospitals and other entities hostage by freezing computers, encrypting data and demanding money through online bitcoin payments.
Security agencies around the world continued to assess the cyberattack, which targeted computer systems at homes, businesses and government agencies in almost 100 countries.
"The recent attack is at an unprecedented level and will require a complex worldwide investigation to identify the culprits", it said in a statement.
The First Minister and Ms Robison have been updated on the situation and Justice Secretary Michael Matheson has participated in the UK Government COBR meeting chaired by the Home Secretary this afternoon.
The former Central Intelligence Agency employee said it was likely the malware used in the attack was written by the USA security experts.
The malicious software behind the attack appeared to exploit a vulnerability in Microsoft Windows that was supposedly identified by the National Security Agency.
The U.K.'s National Cyber Security Center was "working round the clock" to restore vital health services, while urging people to update security software fixes, run anti-virus software and back up their data elsewhere. Germany's national railway says that it was among the organizations affected by the global cyberattack but there was no impact on train services. Hackers said they stole the tools from the NSA and dumped them on the internet.
Russian cellular phone operators Megafon and MTS were hit.
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Elliptic, a private security firm that investigates ransomware attacks, said that only about $32,000 had been sent to bitcoin addresses listed by the extortionists in ransom demands that flashed on screens of infected computers. Spokeswoman Irina Volk was quoted by the Interfax news agency Saturday as saying the problem had been "localized" and that no information was compromised.
It could have been much worse if not for a young cybersecurity researcher who helped to halt its spread by accidentally activating a so-called "kill switch" in the malicious software.
Some experts said the threat had receded for now, in part because a British-based researcher, who declined to give his name, registered a domain that he noticed the malware was trying to connect to, limiting the worm's spread. His $11 purchase of the name may have saved governments and companies around the world millions, slowing its spread before USA -based computers were more widely infected.
Indeed, while FedEx Corp. reported that its Windows computers were "experiencing interference" from malware - it wouldn't say if it had been hit by the ransomware - other impacts in the US were not readily apparent on Saturday.
The hackers use a type of code to called "kill switch" which spread their virus code all over the laptop software and the victim will lose his access to the data in his computer as soon as he got hacked by RansomWare. Short of paying, options for these individuals and companies are usually limited to recovering data files from a backup, if available, or living without them. Russia's health ministry said its attacks were "effectively repelled".
A hacking group called Shadow Brokers released the malware in April claiming to have discovered the flaw from the NSA, Kaspersky said.
The U.S. government on Saturday issued a technical alert with advice on how to protect against the attacks, asking victims to report attacks to the Federal Bureau of Investigation or Department of Homeland Security. Deutsche Bahn said it deployed extra staff to busy stations to provide customer information, and recommended that passengers check its website or app for information on their connections.
French carmaker Renault was forced to stop production at sites in France, Slovenia and Romania, saying the measure was aimed at stopping the virus from spreading.
Telecommunications company Telefonica was among many targets in Spain.
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