First-Contact External Email Senders

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This query lists external email senders seen for the first time in the period (most recent first), surfacing new first-contact relationships, using the EmailEvents table.

Attribute Value
Type Hunting Query
Solution GitHub Only
ID a7373b95-2471-4169-9bca-412d6c41334d
Tactics InitialAccess
Techniques T1566
Required Connectors MicrosoftThreatProtection
Source [View on GitHub](https://github.com/Azure/Azure-Sentinel/blob/master/Hunting Queries/Microsoft%20365%20Defender/Email%20and%20Collaboration%20Queries/Mailflow/First-Contact%20External%20Email%20Senders.yaml)

Tables Used

This content item queries data from the following tables:

Table Selection Criteria Transformations Ingestion API Lake-Only
EmailEvents EmailDirection == "Inbound" ✓ ✗ ✓

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