Suspicious Inbox Forwarding Identity Protection

calendar Aug 14, 2025 · attack.t1114.003 attack.collection  ·
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Indicates suspicious rules such as an inbox rule that forwards a copy of all emails to an external address

Sigma rule (View on GitHub)

 1title: Suspicious Inbox Forwarding Identity Protection
 2id: 27e4f1d6-ae72-4ea0-8a67-77a73a289c3d
 3status: test
 4description: Indicates suspicious rules such as an inbox rule that forwards a copy of all emails to an external address
 5references:
 6    - https://learn.microsoft.com/en-us/entra/id-protection/concept-identity-protection-risks#suspicious-inbox-forwarding
 7    - https://learn.microsoft.com/en-us/entra/architecture/security-operations-user-accounts#unusual-sign-ins
 8author: Mark Morowczynski '@markmorow', Gloria Lee, '@gleeiamglo'
 9date: 2023-09-03
10tags:
11    - attack.t1114.003
12    - attack.collection
13logsource:
14    product: azure
15    service: riskdetection
16detection:
17    selection:
18        riskEventType: 'suspiciousInboxForwarding'
19    condition: selection
20falsepositives:
21    - A legitimate forwarding rule.
22level: high

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