Cybersecurity firm Avast said it has tracked more than 75,000 attacks in 99 countries. It said the majority of the attacks targeted Russia, Ukraine and Taiwan.

Worldwide cyber attack ransomware attack including 99 countries
The ransomware, called “WannaCry,” is spread by taking advantage of a Windows vulnerability that Microsoft released a security patch for in March. But computers and networks that haven’t updated their systems are at risk. The exploit was leaked last month as part of a trove of NSA spy tools.

“Affected machines have six hours to pay up and every few hours the ransom goes up,” said Kurt Baumgartner, the principal security researcher at security firm Kaspersky Lab. “Most folks that have paid up appear to have paid the initial $300 in the first few hours.

” Sixteen National Health Service (NHS) organizations in the UK have been hit, and some of those hospitals have canceled outpatient appointments and told people to avoid emergency departments if possible. Spanish telecom company Telefónica was also hit with the ransomware.

Spanish authorities confirmed the ransomware is spreading through the vulnerability, called “EternalBlue,” and advised people to patch.

“It is going to spread far and wide within the internal systems of organizations — this is turning into the biggest cybersecurity incident I’ve ever seen,” UK-based security architect Kevin Beaumont said.

Russia’s Interior Ministry released a statement acknowledging a ransomware attack on its computers, adding that less than 1% of computers were affected, and that the virus is now “localized.” The statement said antivirus systems are working to destroy it.

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