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Microsoft Disrupts Malware-Signing Service Used in Ransomware Attacks
Security Incidents

Microsoft Disrupts Malware-Signing Service Used in Ransomware Attacks

May 21, 2026
Fox Tempest threat actor exploited Microsoft's Artifact Signing system to deliver signed malware to thousands…
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Microsoft disrupts illegal code-signing operation targeting thousands of US victims
Security Incidents

Microsoft disrupts illegal code-signing operation targeting thousands of US victims

May 20, 2026
Tech giant shuts down malware signing service used by ransomware groups to bypass security controls.
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