Get-DelegateType.ps1

#Function written by Matt Graeber, Twitter: @mattifestation, Blog: http://www.exploit-monday.com/
function Get-DelegateType
{
    param
    (
        [OutputType([Type])]

        [Parameter( Position = 0)]
        [Type[]]
        $Parameters = (New-Object Type[](0)),

        [Parameter( Position = 1 )]
        [Type]
        $ReturnType = [Void]
    )

    $Domain = [AppDomain]::CurrentDomain
    $DynAssembly = New-Object System.Reflection.AssemblyName('ReflectedDelegate')
    $AssemblyBuilder = $Domain.DefineDynamicAssembly($DynAssembly, [System.Reflection.Emit.AssemblyBuilderAccess]::Run)
    $ModuleBuilder = $AssemblyBuilder.DefineDynamicModule('InMemoryModule', $false)
    $TypeBuilder = $ModuleBuilder.DefineType('MyDelegateType', 'Class, Public, Sealed, AnsiClass, AutoClass', [System.MulticastDelegate])
    $ConstructorBuilder = $TypeBuilder.DefineConstructor('RTSpecialName, HideBySig, Public', [System.Reflection.CallingConventions]::Standard, $Parameters)
    $ConstructorBuilder.SetImplementationFlags('Runtime, Managed')
    $MethodBuilder = $TypeBuilder.DefineMethod('Invoke', 'Public, HideBySig, NewSlot, Virtual', $ReturnType, $Parameters)
    $MethodBuilder.SetImplementationFlags('Runtime, Managed')

    Write-Output $TypeBuilder.CreateType()
}