Beware, for WannaCry has just begun and already, the virus - a malware or more precisely a ransomware - has taken down as many as 200,000 computers in more than 150 countries around the world. It needs to make it easier to keep those systems updated and secure.
Dubbed WannaCry or WannaCrypt, the monstrous ransomware hack hit hospitals, schools, government agencies, and other organizations around the globe, Friday, May 12 - locking them out of their own systems and demanding ransom to be paid in Bitcoin.
A security update - or patch - was released by Microsoft in March to protect against the virus, but it appears many NHS organisations had not applied it or were using an older version of the operating system no longer supported - namely Windows XP.
That means an untold number of other infected systems could still be waiting to be discovered when people return to work on Monday and fire up their computers.
Carmaker Renault said one of its French plants, which employs 3,500 people, wasn't reopening Monday as a "preventative step" while technicians deal with the aftermath of the attack.
There are several factors in play.
Though a British security researcher "MalwareTech" managed to stop the spread of the virus, hackers have issued new versions that cybersecurity organisations are trying to counter.
Europol said that the malware attack was of an unprecedented level , and that the numbers were still increasing.
Security experts advised victims not to cough up the ransom, and Mr Op Gen Oorth said that, so far, relatively few had.
Remove the Network connection from your Computer.
No one knows who is behind the attacks.
Though Australian businesses were blessed in the sense the attack was launched after-business hours and on the weekend our time, Hunt believes there's no reason why Australian businesses wouldn't be affected by the still-spreading virus and says updating your system is absolutely critical. "Even if a machine were to get affected it can be reformatted and put to use immediately", Manohar Bhoi, president (technology) at Electronic Payments and Services - a management services firm that handles ATMs for public sector banks - told ToI.
"At this stage we haven't seen the impact that they have seen in the United Kingdom, for example", Prime Minister Malcolm Turnbull said. "You're only safe if you patch ASAP", he tweeted.
Hong Kong-based Ivezic said that the ransomware was forcing some more "mature" clients affected by the worm to abandon their usual cautious testing of patches "to do unscheduled downtime and urgent patching, which is causing some inconvenience".
The apparently random attack, called "WannaCry," hit on Friday and spread like wildfire before a malware researcher identified as Marcus Hutchins was able to halt it temporarily a day later, when workers in many companies weren't in their offices.
Chinese state media reported Monday that more than 29,000 institutions across the country - including universities, railway stations, hospitals and gas stations - had been infected.
Electronic boards at stations announcing arrivals and departures were affected, but train services were not disrupted, Deutsche Bahn said.
Hitachi: The Japanese electronics firm said Monday that its computer systems have been experiencing problems since the weekend, including not being able to send and receive emails or open attached files.
"Obviously, they want those tools in order to spy on people of interest, on other countries, to conduct surveillance", Cluley said.
A spokesman for the Hong Kong Exchanges and Clearing, one of the region's biggest bourses, said all systems were so far working normally.