Unfamiliar Sign-In Properties

Detects sign-in with properties that are unfamiliar to the user. The detection considers past sign-in history to look for anomalous sign-ins.

Sigma rule (View on GitHub)

 1title: Unfamiliar Sign-In Properties
 2id: 128faeef-79dd-44ca-b43c-a9e236a60f49
 3status: test
 4description: Detects sign-in with properties that are unfamiliar to the user. The detection considers past sign-in history to look for anomalous sign-ins.
 5references:
 6    - https://learn.microsoft.com/en-us/entra/id-protection/concept-identity-protection-risks#unfamiliar-sign-in-properties
 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.t1078
12    - attack.persistence
13    - attack.defense_evasion
14    - attack.privilege_escalation
15    - attack.initial_access
16logsource:
17    product: azure
18    service: riskdetection
19detection:
20    selection:
21        riskEventType: 'unfamiliarFeatures'
22    condition: selection
23falsepositives:
24    - User changing to a new device, location, browser, etc.
25level: high

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