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: 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
- Execution
Version: 100 (version history)
Added (Elastic Stack release): 7.7.0
Last modified (Elastic Stack release): 8.5.0
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. ==== Threat mapping
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Execution
- ID: TA0002
- Reference URL: https://attack.mitre.org/tactics/TA0002/
-
Technique:
- Name: Command and Scripting Interpreter
- ID: T1059
- Reference URL: https://attack.mitre.org/techniques/T1059/
Rule version historyedit
- Version 100 (8.5.0 release)
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- Formatting only
- Version 6 (8.4.0 release)
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- Formatting only
- 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