A global cyberattack leveraging hacking tools believed to have been developed by the NSA has infected tens of thousands of computers in nearly 100 countries, disrupting Britain’s health system and global shipper FedEx.

Cyber extortionists tricked victims into opening malicious malware attachments to spam emails that appeared to contain invoices, job offers, security warnings and other legitimate files.

The ransomware encrypted data on the computers, demanding payments of $300 to $600 to restore access. Security researchers said they observed some victims paying via the digital currency bitcoin, though they did not know what percent had given in to the extortionists.

Researchers with security software maker Avast said they had observed 57,000 infections in 99 countries, with Russia, Ukraine and Taiwan the top targets.

Some experts said the threat had receded for now, in part because a British-based researcher, who declined to give his name, registered a domain that he noticed the malware was trying to connect to, limiting the worm’s spread.

“We are on a downward slope, the infections are extremely few, because the malware is not able to connect to the registered domain,” said Vikram Thakur, principal research manager at Symantec.

“The numbers are extremely low and coming down fast.”

But the attackers may yet tweak the code and restart the cycle. The British-based researcher who may have foiled the ransomware’s spread told Reuters he had not seen any such tweaks yet, “but they will.”

Finance chiefs from G7 countries will commit on Saturday to join forces to fight the growing threat of international cyberattacks, according to a draft statement of a meeting they are holding in Italy.

“Appropriate economy-wide policy responses are needed,” the ministers said in their draft statement, seen by Reuters.       

45 U.K. health organizations hit 

The most disruptive attacks were reported in Britain, where hospitals and clinics were forced to turn away patients after losing access to computers on Friday.

British Home Secretary Amber Rudd said Saturday that 45 public health organizations were hit, but she stressed that no patient data had been stolen.

International shipper FedEx Corp said some of its Windows computers were also infected. “We are implementing remediation steps as quickly as possible,” it said in a statement.

Telecommunications company Telefonica was among many targets in Spain. Portugal Telecom and Telefonica Argentina both said they were also targeted.

In Asia, some hospitals, schools, universities and other institutions were affected, although the full extent of the damage is not yet known because it is the weekend.

“I believe many companies have not yet noticed,” said William Saito, a cybersecurity adviser to Japan’s government.

“Things could likely emerge on Monday.”

China’s official Xinhua news agency said some secondary schools and universities had been affected, without specifying how many or identifying them.

Only a small number of U.S.-headquartered organizations were hit because the hackers appear to have begun the campaign by targeting organizations in Europe, said Thakur.

By the time they turned their attention to the United States, spam filters had identified the new threat and flagged the ransomware-laden emails as malicious, Thakur added.

Bug in Microsoft Windows

The U.S. Department of Homeland Security said it was sharing information with domestic and foreign partners and was ready to lend technical support.

Private security firms identified the ransomware as a new variant of “WannaCry” that had the ability to automatically spread across large networks by exploiting a known bug in Microsoft’s Windows operating system.

The hackers, who have not come forward to claim responsibility or otherwise been identified, likely made it a “worm”, or self-spreading malware, by exploiting a piece of NSA code known as “Eternal Blue” that was released last month by a group known as the Shadow Brokers, researchers with several private cyber security firms said.

“This is one of the largest global ransomware attacks the cyber community has ever seen,” said Rich Barger, director of threat research with Splunk, one of the firms that linked WannaCry to the NSA.

The Shadow Brokers released Eternal Blue as part of a trove of hacking tools that they said belonged to the U.S. spy agency.

Microsoft said it was pushing out automatic Windows updates to defend clients from WannaCry. It issued a patch on March 14 to protect them from Eternal Blue. 

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