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Elastic Docs ›Elastic Security Solution [8.3] ›Detections and alerts ›Prebuilt rule reference

Suspicious Powershell Script

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Suspicious Powershell Script

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A machine learning job detected a PowerShell script with unusual data characteristics, such as obfuscation, that may be a characteristic of malicious PowerShell script text blocks.

Rule type: machine_learning

Machine learning job: v3_windows_anomalous_script

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
  • Host
  • Windows
  • Threat Detection
  • ML

Version: 5 (version history)

Added (Elastic Stack release): 7.7.0

Last modified (Elastic Stack release): 8.3.0

Rule authors: Elastic

Rule license: Elastic License v2

Potential false positives

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Certain kinds of security testing may trigger this alert. PowerShell scripts that use high levels of obfuscation or have unusual script block payloads may trigger this alert.

Rule version history

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Version 5 (8.3.0 release)
  • Formatting only
Version 4 (7.12.0 release)
  • Formatting only
Version 3 (7.10.0 release)
  • Formatting only
Version 2 (7.9.0 release)
  • Formatting only
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