Expert who stopped spread of attack by activating software’s ‘kill switch’ says criminals will ‘change the code and start again’

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 organisations including FedEx and Telefónica, as well as the UK’s National Health Service (NHS), where operations were cancelled, 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 security firm Proofpoint, found and inadvertently activated a “kill switch” in the malicious software.

The researcher, who identified himself only as MalwareTech, is a 22-year-old from south-west England who works for Kryptos logic, an LA-based threat intelligence company.

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