In Asia, where Friday's attack occurred after business hours, thousands of new cases were reported on Monday as people came back to work.
This one worked because of a "perfect storm" of conditions, including a known and highly unsafe security hole in Microsoft Windows, tardy users who did not apply Microsoft's March software fix, and malware created to spread quickly once inside university, business or government networks.
Security experts have strongly recommended all Windows users fully update their system with the latest available patches.
Labour's shadow health secretary Jonathan Ashworth, in a letter to Mr Hunt, said concerns were repeatedly flagged about outdated computer systems.
Mr MacGibbon declined to comment on the identity or type of the business impacted by the unprecedented cyber attack but said it was a small company, which did not provide critical infrastructure.
The Justice Secretary 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". Experts did not divulge names of the organisations that have been hit.
But Prime Minister Theresa May has rejected claims the government ignored warnings the NHS was vulnerable to a possible attack.
These include the National Informatics Centre (NIC) for all central and state government systems; Reserve Bank of India, National Payments Corporation of India and Unique Identification Authority of India for protection of the digital payments ecosystem; the Department of Telecommunications to alert Internet service providers for security of the telecommunications network; and Data Security Council of India and Centre for Development of Advanced Computing to circulate advisories to their constituencies so as to cover the industry and users in India, primarily in private sector.
South Korea, US agree to hold summit in late June
Moon took office after his predecessor, Park Geun Hye, was removed from power due to a corruption and abuse-of-power scandal. However, Washington remains Seoul's closest ally and military protector.
"This vulnerability still exits; other people are bound to exploit it", he said.
The US and Russian Federation were among scores of countries affected by the virus, which also hit a Nissan plant in the UK.
He added: "The real problem is that there's the human factor". "Phishing is at the heart of this ransomware attack".
Britain's National Cyber Security Center said on Sunday that it had seen "no sustained new attacks" but warned that compromised computers might not have been detected yet and that the malware could further spread within networks.
Government ministers were due to hold an emergency response meeting later on Monday to deal with the crisis. Details will be announced on MyGov and Social Media.
An worldwide effort is under way to track down the criminals behind an unprecedented global cyber attack that wreaked havoc across the NHS.
Cyber security experts said the spread of the worm dubbed WannaCry - "ransomware" that locked up more than 200,000 computers in more than 150 countries - had slowed but that the respite might only be brief amid fears it could cause new havoc on Monday when employees return to work.
"At the moment, we're in the face of an escalating threat, the numbers are going up", Europol director Rob Wainwright told ITV's Peston on the Sunday program. "The numbers are going up; I am anxious about how the numbers will continue to grow when people go to work and turn (on) their machines on Monday morning".
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