MailItemsAccessed Throttling [Nobelium]

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The MailItemsAccessed action is part of the new Advanced Audit functionality of Microsoft Defender XDR. It's part of Exchange mailbox auditing and is enabled by default for users that have an Office 365 or Microsoft 365 E5 license, or for organizations with a Microsoft 365 E5 Compliance add-on subscription. If more than 1,000 MailItemsAccessed audit records are generated in less than 24 hours, Exchange Online will stop generating auditing records for MailItemsAccessed activity. When a mailbox is

Attribute Value
Type Hunting Query
Solution GitHub Only
ID 67c763f7-c4fd-4b0f-9d4b-19246d1ec6d7
Tactics Exfiltration
Required Connectors MicrosoftThreatProtection
Source View on GitHub

Tables Used

This content item queries data from the following tables:

Table Selection Criteria Transformations Ingestion API Lake-Only
CloudAppEvents ActionType == "MailItemsAccessed" ?

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