Russian Federation appeared to be the hardest hit, according to security experts, with the country's Interior Ministry confirming it was struck.
A Cobra meeting will be held on Saturday afternoon after 45 NHS organisations were caught up in the global attack which is thought to have affected 99 countries, including the USA and Russian Federation.
The hacking tool, a new variant of "WannaCry" ransomware, is believed to have been developed by the US National Security Agency.
Late on Friday, Microsoft also released patches for a range of long discontinued software, including Windows XP and Windows Server 2003.
"This event should serve as a global wake-up call the means of delivery and the delivered effect is unprecedented", Rich Barger, the director of threat research at security firm Splunk, said in a separate statement.
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Arsenal manager Arsene Wenger: "Traditionally there is a fierce rivalry and they had always a very direct game against us". It's hard to accept. "That's the most important". "It was another game against a top-six side without reward".
The head of the National Cyber Security Centre, Ciaran Martin, said the organisation is "working round the clock with United Kingdom and worldwide partners and with private sector experts" to fix the damage. The attack froze computers at hospitals across the country, with some canceling all routine procedures.
She added that lessons may need to be learned in the wake of the breach, which has affected NHS services across England and Scotland.
Doctors reported seeing computers go down "one by one" as the "ransomware" took hold on Friday, locking machines and demanding money to release the data. "We are continuing to monitor the situation".
A spokesman for the Russian Health Ministry, Nikita Odintsov, said on Twitter that the cyberattacks on his ministry were "effectively repelled".
IT experts are rushing to fix the computer systems of around 40 NHS trusts and several GP practices in England and Scotland that were hit by a cyber attack yesterday.
Ireland not affected in 'biggest ever' cyber attack
The hunt was on for the culprits behind the assault, which was being described as the biggest cyber ransom attack ever. Many canceled all routine procedures and asked patients not to come to the hospital unless it was an emergency.
The central bank's IT attack monitoring centre "detected mass distribution of harmful software" but no "instances of compromise", it said.
He declined to confirm media reports that production at the plant, which employs 7,000, had been halted. Radio Slovenia said Saturday the Revoz factory in the southeastern town of Novo Mesto stopped working Friday evening to stop the malware from spreading _ and was working with the central office in France to resolve the problem.
Dr Krishna Chinthapalli, a neurology registrar at the National Hospital for Neurology and Neurosurgery in London, had warned that an increasing number of hospitals could be shut down by ransomeware attacks in an article on the vulnerability of the NHS network in the "British Medical Journal" on Wednesday, two days before the major cyber-hack.
Security experts said the attack appeared to be caused by a self-replicating piece of software that enters companies when employees click on email attachments, then spreads quickly internally from computer to computer when employees share documents.
The Shadow Brokers released Eternal Blue as part of a trove of hacking tools that they said belonged to the USA spy agency.
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But it will be a forum where countries like Pakistan will raise questions about India's human rights actions in Kashmir . He said, "Whether this Act should be repealed or not is a matter of on-going vibrant political debate in my country".
The attacks, which experts said affected dozens of countries, used a technique known as ransomware that locks users' files unless they pay the attackers a designated sum in the virtual Bitcoin currency. Elsewhere in Europe, the attack hit companies including Spain's Telefonica, a global broadband and telecommunications company.
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