The "ransomware" cyber attack hit Chinese traffic police and schools on Monday as it rolled into Asia for the new work week, while authorities in Europe said they were trying to prevent hackers from spreading new versions of the virus.
Britain first raised global alarm when it caused hospitals to divert ambulances on Friday.
For the most part, however, banks remained insulated from the cyber attack.
The ransomware program demanded a payment worth £230 to unlock the affected computers. And hackers would still find holes to exploit, because such holes are inevitable.
French carmaker Renault said its plant in the northern town of Douai would not reopen on Monday as it dealt with the cyber-attack.
Mikko Hypponen, chief research officer at the Helsinki-based cyber security company F-Secure, told AFP that the attack was "the biggest ransomware outbreak in history", saying that 130,000 systems in more than 100 countries had been affected.
Ransomware is a kind of malicious software that, as its name implies, takes a computer hostage and holds it for ransom.
Europol provides free decryption downloads for most ransomware already detected, though not yet for this particular attack.
China appeared over the weekend to have been particularly vulnerable, raising worries about how well the world's second largest economy would cope when it opened for business on Monday.
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The ransomware that hit the NHS in England and Scotland, known as Wanna Decryptor or WannaCry, infected hundreds of thousands of machines.
His law firm sued LinkedIn after a 2012 data breach, alleging individuals paid for premium accounts because the company falsely stated it had top-quality cyber security measures.
Affected bodies included a social security department in the city of Changsha, the exit-entry bureau in Dalian, a housing fund in Zhuhai and an industry watchdog in Xuzhou. Anyone who regularly deals with public services in person will probably have seen government employees struggling with outdated computer systems.
"It is important to note that the vast majority of NHS organisations report that they are running contemporary IT systems, which are commissioned depending on local need", the NHS said in a statement.
They are now being forced to pay $300 (£230) to continue working on end-of-year projects due to be handed in soon, our correspondent says. Some have also been machines involved in manufacturing or hospital functions, hard to patch without disrupting operations.
The malware attack, which began on Friday and has been linked by some researchers to previous hits by a North Korean-run hacking operation, leveraged a tool built by the NSA that leaked online in April, Microsoft says.
Krishna Chinthapalli, a doctor at Britain's National Hospital for Neurology & Neurosurgery who wrote a paper on cybersecurity for the British Medical Journal, said many British hospitals still use Windows XP software, introduced in 2001.
Shares in firms that provide cyber security services jumped on the prospect of companies and governments spending more money on defences, led by Israel's Cyren Ltd and United States firm FireEye Inc. There were no reported cases in New Zealand.
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