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	Microsoft Defender XDR
ID	6ad2dbb3-40de-4e39-a3b0-5c8be4e37b7b
Tactics	InitialAccess
Techniques	T1566
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
EmailEvents	EmailDirection == "Inbound"	✓	✗	✓

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