Sign-In From Malware Infected IP

Indicates sign-ins from IP addresses infected with malware that is known to actively communicate with a bot server.

Sigma rule (View on GitHub)

 1title: Sign-In From Malware Infected IP
 2id: 821b4dc3-1295-41e7-b157-39ab212dd6bd
 3status: test
 4description: Indicates sign-ins from IP addresses infected with malware that is known to actively communicate with a bot server.
 5references:
 6    - https://learn.microsoft.com/en-us/entra/id-protection/concept-identity-protection-risks#malware-linked-ip-address-deprecated
 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.t1090
12    - attack.command_and_control
13logsource:
14    product: azure
15    service: riskdetection
16detection:
17    selection:
18        riskEventType: 'malwareInfectedIPAddress'
19    condition: selection
20falsepositives:
21    - Using an IP address that is shared by many users
22level: high

References

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