process where host.os.type == "windows" and event.type == "start" and
(
  (process.pe.original_file_name == "MsMpEng.exe" and not process.name : "MsMpEng.exe") or
  (
    process.name : "MsMpEng.exe" and
    not process.executable : (
            "?:\\ProgramData\\Microsoft\\Windows Defender\\*.exe",
            "?:\\Program Files\\Windows Defender\\*.exe",
            "?:\\Program Files (x86)\\Windows Defender\\*.exe",
            "?:\\Program Files\\Microsoft Security Client\\*.exe",
            "?:\\Program Files (x86)\\Microsoft Security Client\\*.exe",

            /* Crowdstrike specific exclusion as it uses NT Object paths */
            "\\Device\\HarddiskVolume*\\ProgramData\\Microsoft\\Windows Defender\\*.exe",
            "\\Device\\HarddiskVolume*\\Program Files\\Windows Defender\\*.exe",
            "\\Device\\HarddiskVolume*\\Program Files (x86)\\Windows Defender\\*.exe",
            "\\Device\\HarddiskVolume*\\Program Files\\Microsoft Security Client\\*.exe",
            "\\Device\\HarddiskVolume*\\Program Files (x86)\\Microsoft Security Client\\*.exe"
    )
  )
)