Azure Unusual Authentication Interruption

Detects when there is a interruption in the authentication process.

Sigma rule (View on GitHub)

 1title: Azure Unusual Authentication Interruption
 2id: 8366030e-7216-476b-9927-271d79f13cf3
 3status: test
 4description: Detects when there is a interruption in the authentication process.
 5references:
 6    - https://learn.microsoft.com/en-us/entra/architecture/security-operations-privileged-accounts
 7author: Austin Songer @austinsonger
 8date: 2021/11/26
 9modified: 2022/12/18
10tags:
11    - attack.initial_access
12    - attack.t1078
13logsource:
14    product: azure
15    service: signinlogs
16detection:
17    selection_50097:
18        ResultType: 50097
19        ResultDescription: 'Device authentication is required'
20    selection_50155:
21        ResultType: 50155
22        ResultDescription: 'DeviceAuthenticationFailed'
23    selection_50158:
24        ResultType: 50158
25        ResultDescription: 'ExternalSecurityChallenge - External security challenge was not satisfied'
26    condition: 1 of selection_*
27falsepositives:
28    - Unknown
29level: medium

References

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