Fox Tempest Malware-Signing Service Abused Microsoft Artifact Signing to Certify Malware

A financially motivated threat actor known as Fox Tempest has been operating a sophisticated malware-signing-as-a-service (MSaaS) platform that abused Microsoft’s Artifact Signing infrastructure to generate trusted digital signatures for malicious code. This activity enabled cybercriminals to bypass security controls and distribute malware that appeared to be legitimately signed. In May 2026, Microsoft’s Digital Crimes Unit […] The post Fox Tempest Malware-Signing Service Abused Microsoft Artifact Signing to Certify Malware appeared first on Cyber Security News.