Friday's attack was based on a Windows vulnerability that was purportedly identified by the U.S. National Security Agency and was later leaked to the internet.
The National Health Service (NHS) said 16 of its organizations reported they were victims.
As per some reports, Russian Federation faced more infections among countries.
The attack disrupted Britain's health system and companies including carmaker Renault RENA.PA and global shipper FedEx.
Chris Mimnagh, another doctor in Liverpool, told the Guardian: "Unable to access our clinical system - as a precaution our area has severed links to the wider NHS, which means no access to our national systems, no computers means no records, no prescriptions, no results". Some chemotherapy patients were even sent home because their records could not be accessed.
In Asia, some hospitals, schools, universities and other institutions were affected, although the full extent of the damage is not yet known because it is the weekend.
The U.S. Department of Homeland Security said late on Friday it was aware of reports of the ransomware, was sharing information with domestic and foreign partners and was ready to lend technical support.
Some 1,000 Windows-operated PCs were affected, which is less than one percent of the total number of such computers in the ministry, spokeswoman Irina Volk said in a statement.
The cyber attack, which struck on Friday afternoon, has so far infected tens of thousands of computers in almost 100 countries, including NHS hospitals in the UK. For a clear picture, WannaCry is a form of ransomware that locks up files on your computer and encrypts them in a way that you can not access them.
"Both staff and patients were frankly pretty appalled that somebody, whoever they are, for commercial gain or otherwise, would attack a health care organization", he said.
Infected computers showed a screen giving the user three days to pay the ransom.
"This attack was not specifically targeted at the NHS and is affecting organizations from across a range of sectors".
The country's central bank said the banking system was hit, and the railway system also reported attempted breaches.
In Spain, some big firms took pre-emptive steps to thwart ransomware attacks following a warning from the National Cryptology Centre of "a massive ransomware attack".
Finance chiefs from the Group of Seven rich countries will commit on Saturday to join forces to fight the growing threat of global cyber attacks, according to a draft statement of a meeting they are holding in Italy.
"You can't just infect that many computers in a single day", he said.
The attacks used ransomware, which locks users' files unless they pay the attackers a designated sum in the virtual Bitcoin currency.
Telecommunications company Telefonica was among many targets in Spain.
Andrew Barratt, managing principal of Coalfire, a company which provides cybersecurity risk assessments to the healthcare sector, said that many NHS hospitals used PCs with outdated Windows operating systems, which have makes them easy to attack.
Patrick Ward, a 47-year-old sales director, said his heart operation, scheduled for Friday, was canceled at St. Bartholomew's Hospital in London.
"At this stage", the NHS said, "we do not have any evidence that patient data has been accessed".
The effects of the attack on Turkey are unclear. "It's stressful enough for someone going through recovery or treatment for cancer".
The attack affected systems in almost 100 countries, including the Britain's health system, Russia's Interior Ministry and global logistics company FedEx.
British government officials and intelligence chiefs have repeatedly highlighted the threat to critical infrastructure and the economy from cyberattacks.
Cyber security experts scrambled Saturday to contain the impact of an unprecedented global cyber-attack that hit Russia's banks, British hospitals, FedEx and European auto factories. "Our teams are working to resolve the issue".
Ransomware attacks have also been soaring. In February 2016, a Los Angeles hospital, the Hollywood Presbyterian Medical Center, paid $17,000 in Bitcoin to hackers who took control of its computers for more than a week.
Doctors have been posting on Twitter about what has been happening to their systems.
Apple, which Buffett bought a stake in previous year , accounts for about 5.5% of Berkshire's portfolio. Had the new law been in effect, Buffett said his taxes would have gone down 17 percent a year ago .
Uber has seen a string of high-profile executive departures following a controversy over sexual harassment and discrimination. In Waymo's telling, this was a grand conspiracy by Uber to steal trade secrets by hiring away a key engineer.
He admits he can not hit many balls on the range and only managed nine practice holes before he played at the Masters last month. So it's, it might just be a flare-up of what happened previously and I just need to rest for a few days and it might be OK.
Pope Francis is urging Catholics to "tear down all walls" and go to the peripheries to spread peace and justice. On Saturday, two shepherd children from Portugal will officially become saints of the Roman Catholic Church.
Security experts from Kaspersky Lab and Avast Software say Russian Federation was the hardest hit, followed by Ukraine and Taiwan. Unfortunately, it doesn't help people who are already hit by the ransom, but at least it prevented it rolling out further.
Raising interest rates would help limit inflation but hurt growth by making borrowing more expensive for companies and households. The MPC noted that both regular and total pay had been weaker than policymakers expected in February.
Widespread views are that the communist nation has used the detentions as bargaining chips in its negotiations with Washington. Advising Americans on the risks involved in traveling to North Korea, Adams noted the brutality of the DPRK's legal system.
We started this season to try to solve the problems and find the solution to change the situation created in the previous season. We have worked a lot, we've worked very hard and I like to repeat that this is a good season.
The NHS said it was not attacked specifically, and the attack is "affecting organizations from across a range of sectors". First discovered in February of this year, the attack has been wreaking havoc on a number of computer systems recently.
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