The cyber-attack that has hit 150 countries since Friday should be treated by governments around the world as a "wake-up call", Microsoft says.
WannaCry is a form of "ransomware" that locks up the files on your computer and encrypts them in a way that you can not access them anymore.
Thousands of computer systems could be at risk from Friday's global cyber attack as workers return to work after the weekend, the head of Europol warned, announcing an worldwide manhunt is underway to track down the people responsible. Questions have been raised over Trident's vulnerability to potential cyber attacks, as the system is believed to use ageing Window's XP software - the same operating system targeted by the global ransomware attack.
The attack held users hostage by freezing their computers, popping up a red screen with the words, "Oops, your files have been encrypted!" and demanding money through online bitcoin payment - $300 at first, rising to $600 before it destroys files hours later. "The malware software encrypted files on a victim's computer. but also went on to look for other computers on the same network that could be infected and subsequently used to encrypt files on them".
Businesses in Russian Federation, the United Kingdom and other countries had borne the brunt of the attack, which exploited a Windows vulnerability that hit the mainstream with Shadow Brokers' recent publication of a password that let anybody access NSA-authored exploits.
Matthew Hickey, cofounder of security firm My Hacker House, created a virtual inoculation for companies to use to prevent ransomware while they work on patching. Millions of devices could still potentially be vulnerable if they had failed to apply the required security patches. FTNT, +0.23% and Proofpoint Inc. "Those who do not will see their systems affected at an increasing rate by different variants of this malware". Network security companies Fortinet Inc.
Kurtis Baron, a security specialist with consultants Fidus Information Security who has worked with Hutchins in the past, told NBC News on Sunday that he "doesn't doubt for a moment that Marcus, and people like him, will be getting ready to deal with a second attack" on Monday. And it's expected to cause more problems on Monday.
European governments and companies appeared early Monday to have avoided further fallout from a crippling global cyberattack, the police agency Europol said. Companies including Hitachi and Nissan Motor Co. reported problems but said they said had not seriously affected their business operations.
As well as drawing criticism from Microsoft over governmental stockpiling of vulnerabilities, the widespread success of the ransomware has turned WannaCry into a live demonstration of just how risky poor patching and backup practices can be.
He said: "This is an emerging pattern in 2017".
"More action is needed, and it's needed now", he said. Do not click on links or download software you don't know anything about.
"In the meantime, we wish to reassure patients that your GP will be there for you as usual if you are taken ill and that you will receive the best possible care from the NHS, despite the current difficulties".
"You are dealing with a criminal", he said.
WannaCry takes advantage of a vulnerability in Microsoft Windows.