Suspicious Powershell Scriptedit

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: 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



  • Elastic
  • Host
  • Windows
  • Threat Detection
  • ML

Version: 4 (version history)

Added (Elastic Stack release): 7.7.0

Last modified (Elastic Stack release): 7.12.0

Rule authors: Elastic

Rule license: Elastic License v2

Potential false positivesedit

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 historyedit

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