Spike in Logon Eventsedit

A machine learning job found an unusually large spike in successful authentication events. This can be due to password spraying, user enumeration or brute force activity.

Rule type: machine_learning

Machine learning job: auth_high_count_logon_events

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



  • Elastic
  • Authentication
  • Threat Detection
  • ML
  • Credential Access

Version: 2 (version history)

Added (Elastic Stack release): 7.14.0

Last modified (Elastic Stack release): 8.4.0

Rule authors: Elastic

Rule license: Elastic License v2

Potential false positivesedit

Build servers and CI systems can sometimes trigger this alert. Security test cycles that include brute force or password spraying activities may trigger this alert. ==== Threat mapping


Rule version historyedit

Version 2 (8.4.0 release)
  • Formatting only