The police have also asked people not to "pay a ransomware ransom" as doing so will fuel the ransomware economy.
The WannaCry ransomware is nasty and once it gets hold of your files, there's no way to decrypt them - at least not for now.
Payment in crypto-currency bitcoin helps hackers cover their tracks.
NHS, however, abandoned the custom support for unknown reasons in 2015 which exposed it to last week's ransomeware attack. Indian computers have badly been affected but most of the computers belong to private organizations.
Microsoft had released a patch in March to counter WannaCrypt ransomware, the company also issued a prompt update on Friday to Windows Defender to detect the WannaCrypt attack.
Since the beginning of the attack, WannaCry has already caused massive disruption around the globe.
And who better to talk about it than former director of the NSA and ex-chief of the Central Security Service, general Keith Alexander?
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"This attack provides yet another example of why the stockpiling of vulnerabilities by governments is such a problem", Microsoft President and Chief Legal Officer Brad Smith said in a blog post on Sunday, comparing the recent leaks of NSA and Central Intelligence Agency hacking tools to, in the real world, the theft of cruise missiles. It exploits a flaw in Microsoft's Remote Desktop Protocol in Windows XP and Windows 2003 operating systems.
Similarly, two big telecom companies, Telefónica (TEF) of Spain and Megafon of Russian Federation, were also hit, as was Japanese carmaker Nissan (NSANF) in the United Kingdom.
However, the most surprising info bundle up for the offer, as mentioned in the message, will have to be the compromised network data from Russian, Chinese, Iranian, or North Korean nukes and missile programs. Most similar viruses rely on humans to spread by tricking them into clicking on an attachment harbouring the attack code.
If your system is on the recent version of Windows and hasn't been attacked by WannaCry yet, then we urge you to update your system with the available security patch immediately.
Europol said it does not know the motive behind it. "The attack is not focused on any particular industry but is widely spread, especially across those organisations, which are online and connected", Quick Heal Technologies' managing director Sanjay Katkar said.
It is also fortunate that smartphones, despite their global popularity, have not yet been targeted in a large-scale malware attack like this.