Any PC user can be a target, whether it is a home computer, endpoints in an enterprise network, or servers used by a government agency or healthcare provider.
Russian Federation said its banking system was among the victims of the attacks, along with the railway system, although it added that no problems were detected.
But as Asia woke up to the working week on Monday, leading Chinese security-software provider Qihoo 360 said "hundreds of thousands" of computers in the country were hit at almost 30,000 institutions including government agencies. Microsoft says payment does not guarantee unlocking. Initial infections from WannaCry may have spread through email.
The primary steps you can take to avoid the ransomware affecting your own personal devices are to be on guard for suspicious emails and don't click on any links or download any suspicious attachments.
"If you look at who's been impacted by this virus, it's a huge variety across different industries and across worldwide governments", she said.
A ransomware called WannaCry began hitting computers and wreaking havoc across the world on Saturday.
They should immediately update their Windows operating system and back up their data.
Firstly, you're only likely to be affected if you use a Windows operating system.
The cyberattacks started Friday and spread rapidly around the globe using a security flaw in Microsoft's Windows XP operating system, an older version that is no longer given mainstream tech support by the United States giant.
Smith said Microsoft has the "first responsibility" to address the problem.
"In this instance, this included the development and release of the patch in March, a prompt update on Friday to Windows Defender to detect the WannaCrypt attack".
"We've never seen anything like this", he said.
"These days, we put so much of our personal information online and we should all take extra care to help protect our data and ourselves on the Internet".
Microsoft said the situation was "painful" and that it was taking "all possible actions to protect our customers".
What should I do if my computer has been infected?
Computers and networks that hadn't recently updated their systems are still at risk because the ransomware is lurking.
Enable pop-up blocker on web browser. If the ransomware has locked your entire PC, as WannaCry has done, combating it is more hard.
Sri Lanka Computer Emergency Readiness Team however informed the public to be on high level alert for this malicious software.
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