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PowerShell PSReflect Script

Detects PowerShell script block content containing PSReflect-style helper indicators, such as Add-Win32Type, New-InMemoryModule, or DllImport patterns, that may support dynamic Win32 API invocation from PowerShell.

View Source

Detection Logic

event.category:process and host.os.type:windows and
  powershell.file.script_block_text:(
    "New-InMemoryModule" or
    "Add-Win32Type" or
    psenum or
    DefineDynamicAssembly or
    DefineDynamicModule or
    "Reflection.TypeAttributes" or
    "Reflection.Emit.OpCodes" or
    "Reflection.Emit.CustomAttributeBuilder" or
    "Runtime.InteropServices.DllImportAttribute"
  ) and
  not user.id : "S-1-5-18"

False Positives

⚠ Legitimate PSReflect use when reconstructed content, imported API set, script origin, launcher, user/host scope, and same-host effects align with an approved workflow

Field Validations

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