Microsoft says it has disrupted a malware-signing-as-a-service (MSaaS) operation that abused the company's Artifact Signing service to generate fraudulent code-signing certificates used by ransomware gangs and other cybercriminals. [...]

https://www.bleepingcomputer.com/news/security/cybercrime-service-disrupted-for-abusing-microsoft-platform-to-sign-malware/