Decoding Microsoft 365 Audit Log Events Using Bitfield Mapping Technique – Investigation Report

When users authenticate to Microsoft cloud services, their activities generate authentication events recorded across multiple logging systems. Microsoft Entra sign-in logs and Microsoft 365 audit logs capture identical authentication events but represent this critical security data using different formats. Security analysts investigating incidents frequently encounter the UserAuthenticationMethod field in Microsoft 365 sign-in events, which displays […]

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