Reports suggest that over two lakh systems globally could have been infected by the malicious software that blocks access to data unless a ransom is paid. The ransomware locks up the computer with the group which carried out the attack asking for $300 payment in bitcoins to send an unlock key. There are some that create pop-ups that are hard or impossible to close, rendering the machine hard or impossible to use. Sunnyvale-based security firm ProofPoint says one of its employees in France first noticed WannaCry's digital "signature" matched up with the purported NSA code leaked by the Shadow Brokers.
President Vladimir Putin said there was no significant damage to Russian institutions such as banks and hospitals, but asserted the incident was worrisome and warranted immediate talks on a serious political level.
What is so special about Wannacry?
But, as the world grapples to overcome the effect of "WannaCry", and even though it has even managed to halt its spread, the ransomware has evolved into numerous new variants over the weekend.
This means that it gets into your computer and looks for other computers to try and spread itself as far and wide as possible.
According to Microsoft's blog, older versions of Windows that are no longer supported by Microsoft were vulnerable, which includes Windows 8 and Windows XP, which the majority of NHS Trusts were running. Many security firms are already aware of WannaCry in past forms and most are looking at this one right now to see how it might be stopped.
Microsoft says government hoarding of hacking tools is partly to blame for the cyberattacks that crippled computer systems around the world on Friday.
Bkav recommends that all computer users immediately install updates and security patches and hotfixes via Windows Update.
The so-called WannaCry cyberattack has affected hundreds of thousands of computers by exploiting vulnerabilities in Microsoft's Windows XP software, creating havoc around the world.
On top of that, the NSA would likely be able to claim that it is shielded from liability under the doctrine of sovereign immunity, which says that the government can not be sued over carrying out its official duties.
A Microsoft spokesman reached Sunday said the company had no comment.