Suspicious Browser Activity

Indicates anomalous behavior based on suspicious sign-in activity across multiple tenants from different countries in the same browser

Sigma rule (View on GitHub)

 1title: Suspicious Browser Activity
 2id: 944f6adb-7a99-4c69-80c1-b712579e93e6
 3status: test
 4description: Indicates anomalous behavior based on suspicious sign-in activity across multiple tenants from different countries in the same browser
 5references:
 6    - https://learn.microsoft.com/en-us/entra/id-protection/concept-identity-protection-risks#suspicious-browser
 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: 'suspiciousBrowser'
22    condition: selection
23falsepositives:
24    - We recommend investigating the sessions flagged by this detection in the context of other sign-ins from the user.
25level: high

References

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