Activity From Anonymous IP Address

calendar Sep 6, 2023 · attack.t1078 attack.persistence attack.defense_evasion attack.privilege_escalation attack.initial_access  ·
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Identifies that users were active from an IP address that has been identified as an anonymous proxy IP address.

Sigma rule (View on GitHub)

 1title: Activity From Anonymous IP Address
 2id: be4d9c86-d702-4030-b52e-c7859110e5e8
 3status: experimental
 4description: Identifies that users were active from an IP address that has been identified as an anonymous proxy IP address.
 5references:
 6    - https://learn.microsoft.com/en-us/azure/active-directory/identity-protection/concept-identity-protection-risks#activity-from-anonymous-ip-address
 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.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: 'riskyIPAddress'
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

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