Measurable Increase Of Successful Authentications

calendar Oct 23, 2025 · attack.privilege-escalation attack.persistence attack.initial-access attack.defense-evasion attack.t1078  ·
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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.privilege-escalation
12    - attack.persistence
13    - attack.initial-access
14    - attack.defense-evasion
15    - attack.t1078
16logsource:
17    product: azure
18    service: signinlogs
19detection:
20    selection:
21        Status: Success
22        Count: "<10%"
23    condition: selection
24falsepositives:
25    - Increase of users in the environment
26level: low

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