Operations and appointments cancelled at some Yorkshire hospitals — NHS cyber attacks

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.

Thousand more infections were reported on Monday, mostly in Asia, which had been closed for business when the malware first hit, reports the Associated Press. Make sure your computer is running the latest version of its operating system.

In England, 47 NHS trusts reported problems at hospitals and 13 NHS organisations in Scotland were affected by the virus, which led to some hospitals cancelling treatments and appointments and diverting ambulances to other sites.

"They have been working I know through the night nearly to make sure patches are in place to make sure that hopefully the NHS services can get back to normal", he told BBC radio.

Around 6500 NHS Scotland computers still use an outdated operating system, the health minister has confirmed following last week's cyber attack.

The attack hit one in five of the nation's 248 National Health Service (NHS) groups.

However, speaking ahead of an emergency ministerial meeting, Health Secretary Jeremy Hunt told local media an anticipated second waves of attacks had so far failed to materialize.

On May 12, 2014, the "WannaCry" ransomware attack compromised over 70,000 organizations in almost 100 countries. The software took control of the people's computer and files and demanded users to pay $300 (Rs 19,000 approx) in virtual currency Bitcoin to unlock the files and regaining access to their systems.

Oxford University Hospitals NHS Foundation Trust said it has not been affected by the attack but Oxford University Hospitals NHS Foundation Trust communications manager Roy Probert said the trust is still remaining vigilant.

Europe and Russian Federation were hit the hardest.

Urging businesses and computer users to keep their systems current and updated, Smith says the WannaCry attack shows the importance of collective action to fight cyber crime. Hackers made use of a vulnerability that existed in Microsoft Windows. -National Security Agency for its own intelligence-gathering purposes and later leaked online.

As early as March, Microsoft had issued a "critical" free software update that would fix the vulnerability.

Will we see further reflection in the stock market if the ransomware attacks continue?

RBI has asked banks to follow the instructions of government organisation CERT-In to prevent the attack by ransomware, "WannaCry", which has impacted various IT networks in over 150 countries. "It would not be very hard at all to re-release this ransomware attack without a kill switch or without an approved kill switch that only they can activate". Additionally, experts warn that copycats could also try another attack.