Increased Failed Authentications Of Any Type

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

Sigma rule (View on GitHub)

 1title: Increased Failed Authentications Of Any Type
 2id: e1d02b53-c03c-4948-b11d-4d00cca49d03
 3status: test
 4description: Detects when sign-ins increased by 10% or greater.
 5references:
 6    - https://learn.microsoft.com/en-us/entra/architecture/security-operations-user-accounts#monitoring-for-failed-unusual-sign-ins
 7author: Mark Morowczynski '@markmorow', MikeDuddington, '@dudders1'
 8date: 2022/08/11
 9tags:
10    - attack.defense_evasion
11    - attack.t1078
12logsource:
13    product: azure
14    service: signinlogs
15detection:
16    selection:
17        Status: failure
18        Count: "<10%"
19    condition: selection
20falsepositives:
21    - Unlikely
22level: medium

References

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