Decoding Microsoft 365 Audit Logs Using Bitfield Mapping: An Investigation Report

Understanding exactly how users authenticate to cloud services is crucial for effective security monitoring. A recently refined bitfield mapping technique decodes the opaque UserAuthenticationMethod values in Microsoft 365 audit logs, transforming numeric codes into actionable, human-readable descriptions. This breakthrough empowers incident responders to identify primary authentication methods even when only Microsoft 365 audit logs are […]

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