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Elastic Docs ›Elastic Security Solution [8.0] ›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: 2 (version history)

Added (Elastic Stack release): 7.14.0

Last modified (Elastic Stack release): 7.15.0

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 an 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.

Rule version history

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Version 2 (7.15.0 release)
  • Formatting only
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