Measurable Increase Of Successful Authentications

Detects when successful sign-ins increased by 10% or greater.

Sigma rule (View on GitHub)

 1title: Measurable Increase Of Successful Authentications
 2id: 67d5f8fc-8325-44e4-8f5f-7c0ac07cb5ae
 3status: test
 4description: Detects when successful sign-ins increased by 10% or greater.
 5references:
 6    - https://learn.microsoft.com/en-us/entra/architecture/security-operations-user-accounts#monitoring-for-successful-unusual-sign-ins
 7author: Mark Morowczynski '@markmorow', MikeDuddington, '@dudders1', Tim Shelton
 8date: 2022/08/11
 9modified: 2022/08/18
10tags:
11    - attack.defense_evasion
12    - attack.t1078
13logsource:
14    product: azure
15    service: signinlogs
16detection:
17    selection:
18        Status: Success
19        Count: "<10%"
20    condition: selection
21falsepositives:
22    - Increase of users in the environment
23level: low

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