He said Friday's cyberextortion attack, the biggest in history, was going to be dwarfed by the next big ransomware attack. John Bambanek, threat research manager at the Fidelis Cybersecurity firm, said that "the fact that a vulnerability developed by the NSA was used in this attack shows the dangers that can happen when this knowledge gets out into the wild even after a patch has been developed".
Europol said its cybercrime specialists will support affected countries as a "complex worldwide investigation" to identify the culprits begins.
Those affected see a message on their computer screens demanding payment in the digital currency bitcoin to restore access.
Experts and government officials urged users not to give in to the hackers' demands.
Wainwright said Europol was working with the Federal Bureau of Investigation in the United States to track down those responsible, saying that more than one person was likely behind it.
"It only guarantees that the malicious actors receive the victim's money, and in some cases, their banking information".
In an unusual step, Microsoft provided direct support to unsupported systems that were impacted by ransomware attack across the globe.
The global police agency boss warned that "all sectors are vulnerable" and should all take "absolutely seriously" the need to run updated systems. "We haven't seen anything like this since Conficker in 2008", Amit Nath, Head of Asia Pacific-Corporate Business at cyber security firm F-Secure Corporation, told IANS. "We will continue to work with affected (organizations) to confirm this", the agency said.
The attacks hit organisations in 100 countries, but have had a particularly severe impact on the NHS.
Telecommunications company Telefonica was among the targets in Spain.
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La campagne pour le second tour de l'élection présidentielle 2017 prend officiellement fin ce vendredi à minuit. Elles donnent une indication des rapports de force et des dynamiques au jour de la réalisation du sondage.
The malware, also known as WannaCry, hit systems in other countries as well, including the United States and Russian Federation.
Hospitals across England reported the cyber attack was causing huge problems to their services and the public in areas affected were being advised to only seek medical care for emergencies.
Germany's rail operator Deutsche Bahn said its station display panels were affected.
Questions have begun to focus on why parts of the NHS proved so vulnerable to an attack that exploited a known Windows vulnerability, patches for which had been available since March.
Shanghai's Fudan University received reports that a large number of school computers were infected with the virus.
"You're only safe if you patch ASAP".
In a post on its website, Britain's National Cyber Security Centre said by registering a domain name that unexpectedly stopped the spread of the malware, the anonymous Britain-based cyber specialist had prevented further infections.
Meanwhile G7 finance ministers meeting in Italy vowed to unite against cyber crime, as it represented a growing threat to their economies and should be tackled as a priority. The danger will be discussed at the G7 leaders' summit next month.
An Indian-origin doctor based in London had warned against the cyber-hack of the UK's state-run National Health Service (NHS) just days before it crippled the country's network.
A Jakarta hospital said on Sunday that the cyber virus had infected 400 computers, disrupting the registration of patients and finding records.
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