The attack came as several companies in Spain were hit by ransomware attacks.
Forcepoint Security Labs said that "a major malicious email campaign" consisting of almost five million emails per hour was spreading the new ransomware.
England's NHS says at least 16 of its organizations were hit by the ransomware.
Mikko Hypponen, chief research officer at the Helsinki-based cybersecurity company F-Secure, called it "the biggest ransomware outbreak in history".
The Ministry of Energy, Tourism and Digital Agenda says the attack Friday affected the Windows operating system of employees' computers in several companies.
Telecommunications giant Telefonica was among the many targets.
A worldwide ransomware attack is affecting countries and organizations from a number of different countries.
Global couriering company FedEx said it had also been infected by the ransomware. The attack appeared to exploit a vulnerability purportedly identified for use by the U.S. National Security Agency and later leaked to the internet.
Several experts monitoring the situation have linked the attacks to vulnerabilities released by a group known as The Shadow Brokers, which recently claimed to have dumped hacking tools stolen from the NSA.
Hospitals in London, northwest England and other parts of the country reported problems with their computer systems Friday. But there's no evidence so far that patient data has been accessed, NHS Digital said.
Turkish military says kills 11 militants after Kurdish YPG fire from Syria
Ayrault said France reached the conclusion after comparing samples from a 2013 sarin attack in Syria that matched the new ones. The strikes killed a number of YPG and peshmerga forces - forces that are assisting the U.S.in its fight against ISIS.
But a spokesman for the GCSB said its specialist cyber arm - the National Cyber Security Centre - is working with a newly formed government taskforce, the National Computer Emergency Response Team, to protect New Zealand's interests.
It said its hospitals had shut down all computer systems as a protective measure and canceled all non-urgent activity.
The problem appeared to begin Friday morning when hospitals in the United Kingdom were crippled by a large-scale cyberattack, which forced operations to be canceled and ambulances to be diverted.
Awais Rashid, a professor of software engineering at Lancaster University, said "the key question" to consider is how an attack such as Friday's could originate "from a noncritical system such as email" and then spread to other systems.
In the meantime the Prime Minister has said that the Government is not aware of any evidence that patient records have been compromised in the massive cyber attack on the NHS.
The Eternal Blue tool allows the malware, which encrypts data on computers and demands a fee to unlock them, to spread through file-sharing protocols set up across organizations, according to the news outlet. In February 2016, the Hollywood Presbyterian Medical Center in California said it had paid a $17,000 ransom to regain control of its computers from hackers. Lidov said that the attack involved demands of payment of $300 worth to free up the system.
"We ask people to use the NHS wisely while we deal with this major incident which is still ongoing".
"Looking at the trends, it was going to happen", he said.
Hospitals have often been targets of such attacks, he said, because they typically have limited or outdated IT infrastructure to defend against them. "Now I had to go through that again", said Harvey, a former hospital porter who had been fasting since the previous evening in preparation for the operation at Royal London Hospital in east London.
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