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Microsoft suspended several accounts on its hardware developer program that signed malicious drivers used by a ransomware group called Cuba to disable endpoint security tools. The driver certificates have been revoked and the drivers will be added to a blocklist that Windows users can optionally deploy.

“In most ransomware incidents, attackers kill the target’s security software in an essential precursor step before deploying the ransomware itself,” researchers from security firm Sophos said in a new report about the incident. “In recent attacks, some threat actors have turned to the use of Windows drivers to disable security products.”

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