Microsoft has successfully disrupted a major cyberattack campaign orchestrated by the Vanilla Tempest threat group in early October 2025. The tech giant revoked over 200 fraudulent certificates that the cybercriminals had used to sign fake Microsoft Teams installation files, which were designed to deliver the Oyster backdoor and deploy Rhysida ransomware on victim systems. Discovery […] The post Microsoft Halts Vanilla Tempest Cyberattack by Revoking Malicious Teams Installer Certificates appeared first on GBHackers Security | #1 Globally Trusted Cyber Security News Platform.
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