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Elastic Docs ›Elastic Security Solution [7.14] ›Detections and alerts ›Prebuilt rule reference

Spike in Failed Logon Events

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Spike in Failed Logon Events

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A machine learning job found an unusually large spike in authentication failure events. This can be due to password spraying, user enumeration or brute force activity and may be a precursor to account takeover or credentialed access.

Rule type: machine_learning

Machine learning job: auth_high_count_logon_fails

Machine learning anomaly threshold: 75

Severity: low

Risk score: 21

Runs every: 15 minutes

Searches indices from: now-30m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Elastic
  • Authentication
  • Threat Detection
  • ML

Version: 1

Added (Elastic Stack release): 7.14.0

Rule authors: Elastic

Rule license: Elastic License v2

Potential false positives

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A misconfigured service account can trigger this alert. A password change on ana account used by an email client can trigger this alert. Security test cycles that include brute force or password spraying activities may trigger this alert.

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