The "O365 Advanced Audit Disabled" detection rule identifies instances when the advanced audit logging feature is disabled for a user in the Office 365 environment. It utilizes audit logs generated by Office 365, specifically monitoring events associated with changes to user licenses in Azure Active Directory workloads. The disabling of advanced auditing poses a significant security risk as it may conceal malicious activities conducted by threat actors who can exploit decreased visibility. If confirmed, attackers could access user mailboxes and accounts undetected, leading to potential data breaches or account compromises. The rule employs a specific search query to monitor for the event signifying this change, triggering alerts when the advanced auditing feature is switched off.