Top 10 External Senders (Spam)

id: 6f606826-b995-4a8d-8c2c-ee08e3d1194a
name: Top 10 External Senders (Spam)
description: |
  Identifies the top 10 external sender addresses delivering inbound emails classified as spam.
  To exclude your own organization's domains (including subdomains), add a filter after the spam filter, e.g.:
    | where SenderFromAddress !contains ".yourdomain.com"
  (Replace "yourdomain.com" with your actual domain.)
  Based on Defender for Office 365 workbook: https://techcommunity.microsoft.com/blog/microsoftdefenderforoffice365blog/part-2-build-custom-email-security-reports-and-dashboards-with-workbooks-in-micr/4411303
requiredDataConnectors:
  - connectorId: MicrosoftThreatProtection
    dataTypes:
      - EmailEvents
tactics:
  - InitialAccess
relevantTechniques:
  - T1566
query: |
  EmailEvents
  | where EmailDirection == "Inbound"
  | where ThreatTypes has "Spam"
  //| where SenderFromAddress !contains ".yourdomain.com"
  | summarize count() by SenderFromAddress
  | sort by count_ desc
  | top 10 by count_
  | render piechart
version: 1.0.0