If similar vulnerabilities are found in PCs running Windows 10, 8 and 7, these systems can also be infected by the ransomware virus-this can happen if the PC doesn't have the patch released in March installed.
U.S. package delivery giant FedEx, European vehicle factories, Spanish telecoms giant Telefonica, Britain's health service and Germany's Deutsche Bahn rail network were among those hit.
Researchers who helped prevent the spread of the malware and cybersecurity firms worked around the clock during the weekend to monitor the situation and install a software patch to block the worm from infecting more computers in corporations across the U.S., Europe and Asia.
"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".
"We weren't able to ingest the threat vector, which was probably an email that contained this malicious code in it, or a link to malicious code, and as a effect we were probably better protected than our European cousins".
There are apprehensions that a second wave of the attack may arrive Monday as employees return and switch on affected computers.
"It was early morning Saturday for us, and that meant the bulk of us weren't at our keyboards", the prime minister's cyber security adviser Alastair MacGibbon said.
Hackers reportedly used a tool known as Eternal Blue and a malicious software called WannaCry to lock users' computers and to demand a payment for the decryption.
Bitcoin, the world's most-used virtual currency, allows anonymous transactions via heavily encrypted codes.
However, Wainwright said Europol was working on the basis that the cyber-attack was carried out by criminals rather than terrorists, but noted that "remarkably few" payments had been made so far.
"This attack provides yet another example of why the stockpiling of vulnerabilities by governments is such a problem", he said.
But Kaspersky said it wasn't clear cut and could be worked around by the culprits.
Brad Smith, who is Microsoft's chief legal officer, said Sunday in a blog post that his company, its customers and the government all share the blame.
The computing giant said software vulnerabilities hoarded by governments have caused "widespread damage". "An equivalent scenario with conventional weapons would be the USA military having some of its Tomahawk missiles stolen".
It is the largest ransomware attack observed in history.
Justice Secretary Michael Matheson said: "Friday's attack has highlighted the need for everyone to have appropriate and robust measures in place to protect against cyber-attacks which could strike any IT system at any time". Germany's national railway says that it was among the organizations affected by the global cyberattack but there was no impact on train services.
Seven hospital trusts are still experiencing serious problems, among them St Bartholomew's Hospital in London, York Teaching Hospital NHS Trust and the University Hospitals of North Midlands Trust.
French carmaker Renault was forced to stop production at sites in France, Slovenia and Romania, while FedEx said it was "implementing remediation steps as quickly as possible".
About a fifth of NHS trusts - the regional bodies that run hospitals and clinics - were hit by the attack on Friday, leading to thousands of canceled appointments and operations. "Which we will", she said.
The Security Council has approved six increasingly tougher sanctions resolutions following its nuclear and missile tests. North Korea said it was a test of the abilities of a "newly developed ballistic rocket".
This will be followed in three years time by a new £20 note which will feature the British painter JMW Turner. Banks will continue to accept or replace any old £5 notes brought into a branch by their own customers.
Over the last twelve months Crest Nicholson Holdings Plc's stock price has increased from 520.52 to 640, a change of 22.95%. The stock of Crest Nicholson Holdings PLC (LON:CRST) earned "Hold" rating by Deutsche Bank on Wednesday, February 24.
McCullough's win also marks the second time in a row that the victor of the pageant has been the Miss D.C. representative. She wants to inspire children to go into the STEM fields, science, technology, engineering, and mathematics.
Le Pen's National Front (FN) and the other elections losers are all hell bent on bouncing back in the parliamentary vote. King Salman sent a cable of congratulations to Macron expressing his best wishes to him and the people of France.
Having a family member fall victim to stroke isn't easy so I know her family is on the edge as well as her fans at this time. Her most recent album was " Full Circle ", released in March as Lynn's first new studio album in more than a decade.
NEW YORK (AP ) If last year's Tony Award nomination announcement was pretty simple, this year's is much, much messier. And the star herself, Bette Midler, 71, has not performed on stage in a musical since 1969, the New York Post noted.
Harry Kane expects Tottenham's "family" to stay together next season and says there are few better clubs in the world to play for. Emotional scenes broke out across White Hart Lane when the final whistle blew for the last time.
Instagram on Tuesday also revealed a new "rewind" mode that plays a video in reverse - another feature Snapchat already offers. You can now create hashtags out of stickers that will deep link to other Instagram content that shares that hashtag.
While North Korean's arsenal of missiles is becoming clearer, there is less certainty about how developed its nuclear program is. That would require a flight of 8,000 km or more and technology to ensure a warhead's stable reentry into the atmosphere.
Neville, Carra name Premier League Team of the Season
"We've spoken about the season Cesar Azpilicueta and David Luiz have had and one of the Tottenham centre-backs had to be in it". The former Manchester United man continued by including a fourth Tottenham star, in the form of English global Danny Rose.
Manchester clubs to play derby in Houston this summer
Manchester United and Manchester City's rivalry dates back to 1881 and have played the Manchester Derby rivalry match 173 times. United have previously played in what is now known as NRG Stadium , having defeated the MLS All-Stars 5-2 in 2010.
Motorola launches Moto C and Moto C Plus smartphones
The Moto X4 might be the "ultimate perfection" model for Motorola , but it really is a mid-range smartphone. The major difference among the two comes in the battery department (of course alongside the display ).
Congress clamors to know more about Trump meeting
Some US officials have told Reuters they have been concerned about disclosing highly classified intelligence to Trump. By doing so, Trump jeopardized cooperation from an ally familiar with the inner workings of the Islamic State group.
Most want 'independent' probe of Trump, Russia
Meanwhile, President Trump is facing growing questions about whether he secretly recorded his conversations with Mr Comey. Mr Comey had said he was "uneasy" before the dinner, according to former Director of National Intelligence James Clapper.
More North Korea links found in ransomware attack
WannaCry, in contrast, was wildly indiscriminate - it would infect anything and everything it could, the report said. Officials around the world breathed a sigh of relief on Monday as a fresh wave of attacks failed to appear.