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Suspicious PowerShell Download - Powershell Script

Detects suspicious PowerShell download command

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Detection Logic

{
  "webclient": {
    "ScriptBlockText
| contains": "System.Net.WebClient"
  },
  "download": {
    "ScriptBlockText
| contains": [
      ".DownloadFile(",
      ".DownloadFileAsync(",
      ".DownloadString(",
      ".DownloadStringAsync("
    ]
  },
  "condition": "webclient and download"
}

False Positives

  • ⚠ PowerShell scripts that download content from the Internet

Field Validations

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