Increased Failed Authentications Of Any Type

calendar Oct 23, 2025 · attack.privilege-escalation attack.persistence attack.initial-access attack.defense-evasion attack.t1078  ·
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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.privilege-escalation
11    - attack.persistence
12    - attack.initial-access
13    - attack.defense-evasion
14    - attack.t1078
15logsource:
16    product: azure
17    service: signinlogs
18detection:
19    selection:
20        Status: failure
21        Count: "<10%"
22    condition: selection
23falsepositives:
24    - Unlikely
25level: medium

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