Suspicious Inbox Manipulation Rules

calendar Sep 6, 2023 · attack.t1140 attack.defense_evasion  ·
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Detects suspicious rules that delete or move messages or folders are set on a user's inbox.

Sigma rule (View on GitHub)

 1title: Suspicious Inbox Manipulation Rules
 2id: ceb55fd0-726e-4656-bf4e-b585b7f7d572
 3status: experimental
 4description: Detects suspicious rules that delete or move messages or folders are set on a user's inbox.
 5references:
 6    - https://learn.microsoft.com/en-us/azure/active-directory/identity-protection/concept-identity-protection-risks#suspicious-inbox-manipulation-rules
 7    - https://learn.microsoft.com/en-us/azure/active-directory/architecture/security-operations-user-accounts#unusual-sign-ins
 8author: Mark Morowczynski '@markmorow', Gloria Lee, '@gleeiamglo'
 9date: 2023/09/03
10tags:
11    - attack.t1140
12    - attack.defense_evasion
13logsource:
14    product: azure
15    service: riskdetection
16detection:
17    selection:
18        riskEventType: 'mcasSuspiciousInboxManipulationRules'
19    condition: selection
20falsepositives:
21    - Actual mailbox rules that are moving items based on their workflow.
22level: high

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