Hackers Hit Dozens of Countries With a Stolen N.S.A. Tool
LONDON — Hackers using a tool stolen from the United States government conducted extensive cyberattacks on Friday that hit dozens of countries around the world, severely disrupting Britain’s public health system and wreaking havoc on computers elsewhere, including Russia.
Hospitals in Britain appeared to be the most severely affected by the attacks, which aimed to blackmail computer users by seizing their data. The attacks blocked doctors’ access to patient files and forced emergency rooms to divert people seeking urgent care.
Kaspersky Lab, a Russian cybersecurity firm, said it had recorded at least 45,000 attacks in as many as 74 countries.
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