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Windows Firewall Disabled via PowerShell

Identifies when the Windows Firewall is disabled using PowerShell cmdlets, which can help attackers evade network constraints, like internet and network lateral communication restrictions.

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Detection Logic

process where host.os.type == "windows" and event.type == "start" and
  (
    process.name : ("powershell.exe", "pwsh.exe", "powershell_ise.exe") or
    ?process.pe.original_file_name in ("PowerShell.EXE", "pwsh.dll", "powershell_ise.EXE")
  ) and
  process.args : "*Set-NetFirewallProfile*" and
  process.args : "*-Enabled*" and process.args : "*False*" and
  process.args : ("*-All*", "*Public*", "*Domain*", "*Private*")

False Positives

  • Windows Firewall can be disabled by a system administrator. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment. Windows Profile being disabled by unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule.

Field Validations

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