Security researchers have been unable to find a "kill switch" for the latest cyberattack hitting systems around the world—but they have developed a vaccine.
Researchers say that the Petya ransomware will not encrypt files on computers that have the read-only file "C:\Windows\perfc.dat," the BBC reports.
A guide on how to set that up can be found here, though security experts say people running up-to-date versions of Windows will already be protected. And the fix isn't perfect: Researchers warn that although the "vaccination" will make individual computers immune to the attack, the computers could still become "carriers" capable of spreading the malware to others.
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