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detection_rule.yml

DETECTION AREAS

title: Suspicious PowerShell Execution
description: Detects PowerShell execution with encoded commands
status: experimental
detection:
  selection:
    EventID: 4688
    ProcessName: '*\powershell.exe'
    CommandLine: '*-enc*'
  condition: selection

THREAT DETECTION ADVISOR

Command Line Coverage

Consider also checking for "-encodedcommand" and "-e" variations to catch evasion attempts

Event ID Selection

Good choice using 4688 for process creation monitoring

Enhanced Detection

Try adding parent process checks to reduce false positives from legitimate PowerShell usage

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