Malicious IP Address Sign-In Failure Rate

calendar Aug 12, 2024 · attack.t1090 attack.command-and-control  ·
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Indicates sign-in from a malicious IP address based on high failure rates.

Sigma rule (View on GitHub)

 1title: Malicious IP Address Sign-In Failure Rate
 2id: a3f55ebd-0c01-4ed6-adc0-8fb76d8cd3cd
 3status: test
 4description: Indicates sign-in from a malicious IP address based on high failure rates.
 5references:
 6    - https://learn.microsoft.com/en-us/entra/id-protection/concept-identity-protection-risks#malicious-ip-address
 7    - https://learn.microsoft.com/en-us/entra/architecture/security-operations-user-accounts#unusual-sign-ins
 8author: Mark Morowczynski '@markmorow', Gloria Lee, '@gleeiamglo'
 9date: 2023-09-07
10tags:
11    - attack.t1090
12    - attack.command-and-control
13logsource:
14    product: azure
15    service: riskdetection
16detection:
17    selection:
18        riskEventType: 'maliciousIPAddress'
19    condition: selection
20falsepositives:
21    - We recommend investigating the sessions flagged by this detection in the context of other sign-ins from the user.
22level: high

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