The “accidental hero” who halted the global spread of an unprecedented ransomware attack by registering a garbled domain name hidden in the malware has warned the attack could be rebooted.

The ransomware used in Friday’s attack wreaked havoc on organizations including FedEx and Telefónica, as well as the UK’s National Health Service, where operations were canceled, X-rays, test results, and patient records became unavailable, and phones did not work.

But the spread of the attack was brought to a sudden halt when one UK cybersecurity researcher tweeting as @malwaretechblog, with the help of Darien Huss from the security firm Proofpoint, found and inadvertently activated a “kill switch” in the malicious software.


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