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The Latest: Chinese universities hit by extortion attack

People walk past a Megafon mobile phones shop in Moscow, Russia, Saturday, May 13, 2017. A top Russian mobile operator said Friday it had come under cyberattacks that appeared similar to those that have crippled some U.K. hospitals. Pyotr Lidov, a spokesman for Megafon, said Friday's attacks froze computers in company's offices across Russia. (AP Photo/Ivan Sekretarev)
People walk past a Megafon mobile phones shop in Moscow, Russia, Saturday, May 13, 2017. A top Russian mobile operator said Friday it had come under cyberattacks that appeared similar to those that have crippled some U.K. hospitals. Pyotr Lidov, a spokesman for Megafon, said Friday's attacks froze computers in company's offices across Russia. (AP Photo/Ivan Sekretarev) People walk past a Megafon mobile phones shop in Moscow, Russia, Saturday, May 13, 2017. A top Russian mobile operator said Friday it had come under cyberattacks that appeared similar to those that have crippled some U.K. hospitals. Pyotr Lidov, a spokesman for Megafon, said Friday's attacks froze computers in company's offices across Russia. (AP Photo/Ivan Sekretarev)

LONDON (AP) – The Latest on the global extortion cyberattack that hit dozens of countries on Friday (all times local):

10:40 a.m.

Chinese media are reporting that the global “ransomware” virus attacked many university networks in China.

The Beijing News said Sunday that students at several universities around the country reported being hit by the virus, which blocked access to their thesis papers and dissertation presentations.

In each case, a pop-up window demanded payments of $300, or about 2,000 yuan, in order to free the files.

The attack that began Friday is believed to be the biggest online extortion attack ever recorded, disrupting computers that run factories, banks, government agencies and transport systems. It crippled the British health care system for a day, infecting nearly 20 percent of its health care groups, forcing medical treatments to be canceled or postponed for thousands of people.

A young British cybersecurity researcher discovered a so-called “kill switch” for the attack, limiting the damage.

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6 a.m.

As terrifying as the unprecedented global “ransomware” attack was, cybersecurity experts say it’s nothing compared to what might be coming – especially if companies and governments don’t make major fixes.

Had it not been for a young cybersecurity researcher’s accidental discovery of a so-called “kill switch,” the malicious software likely would have spread much farther and faster that it did Friday.

This is already believed to be the biggest online extortion attack ever recorded, disrupting computers that run factories, banks, government agencies and transport systems in nations as diverse as Russia, Ukraine, Brazil, Spain, India and the U.S.

Security experts tempered the alarm bells by saying that widespread attacks are tough to pull off. This one worked because of a “perfect storm” of conditions, including a known and highly dangerous security hole in Microsoft Windows, tardy users who didn’t apply Microsoft’s March software fix, and malware designed to spread quickly once inside university, business or government networks.