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Elastic Docs ›Elastic Security Solution [7.9] ›Detections and Alerts (beta) ›Prebuilt rule reference

Unusual Linux Network Port Activity

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Unusual Linux Network Port Activity

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Identifies unusual destination port activity that can indicate command-and- control, persistence mechanism, or data exfiltration activity. Rarely used destination port activity is generally unusual in Linux fleets, and can indicate unauthorized access or threat actor activity.

Rule type: machine_learning

Machine learning job: linux_anomalous_network_port_activity_ecs

Machine learning anomaly threshold: 50

Severity: low

Risk score: 21

Runs every: 15 minutes

Searches indices from: now-45m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Elastic
  • Linux
  • ML

Version: 2 (version history)

Added (Elastic Stack release): 7.7.0

Last modified (Elastic Stack release): 7.9.0

Rule authors: Elastic

Rule license: Elastic License

Potential false positives

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A newly installed program or one that rarely uses the network could trigger this alert.

Rule version history

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Version 2 (7.9.0 release)
  • Formatting only
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