Anomalous Token

Indicates that there are abnormal characteristics in the token such as an unusual token lifetime or a token that is played from an unfamiliar location.

Sigma rule (View on GitHub)

 1title: Anomalous Token
 2id: 6555754e-5e7f-4a67-ad1c-4041c413a007
 3status: test
 4description: Indicates that there are abnormal characteristics in the token such as an unusual token lifetime or a token that is played from an unfamiliar location.
 5references:
 6    - https://learn.microsoft.com/en-us/entra/id-protection/concept-identity-protection-risks#anomalous-token
 7    - https://learn.microsoft.com/en-us/entra/architecture/security-operations-user-accounts#unusual-sign-ins
 8author: Mark Morowczynski '@markmorow'
 9date: 2023/08/07
10tags:
11    - attack.t1528
12    - attack.credential_access
13logsource:
14    product: azure
15    service: riskdetection
16detection:
17    selection:
18        riskEventType: 'anomalousToken'
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

References

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