Get-NtSecurityDescriptor.ps1

function Get-NtSecurityDescriptor { 
    param
    (
        [string]$SecurityDescriptor
    )
    $ntsecdesc = New-Object Byte[] ($SecurityDescriptor.Length)

    for ($i = 0; $i -lt $SecurityDescriptor.Length ; $i += 2) {
        $ntsecdesc.Set(($i/2),([Byte]::Parse($SecurityDescriptor.Substring($i, 2), [System.Globalization.NumberStyles]::HexNumber)))
    }

    [System.Security.AccessControl.RawSecurityDescriptor]::new($ntsecdesc,0)
}