packer / winrm / powershell elevated command

gistfile1.txt

{
  "builders": [{
    "type": "virtualbox-windows-ovf",
    "source_path": "ovf/windows_2008_r2.bare.ova",
    "headless": false,
    "boot_wait": "1m",
    "winrm_username": "packer",
    "winrm_password": "packer",
    "winrm_wait_timeout": "10m",
    "guest_additions_mode": "disable",
    "shutdown_timeout": "2h",
    "shutdown_command": "shutdown /s /t 7200 /f /d p:4:1 /c \"Packer Shutdown\"",
    "vboxmanage": [
      ["modifyvm", "{{.Name}}", "--memory", "2048"],
      ["modifyvm", "{{.Name}}", "--cpus", "1"]
    ]
  }],
  "provisioners": [{
    "type": "powershell",
    "scripts": ["scripts/chocolatey.ps1"]
  }, {
    "type": "powershell",
    "elevated_user": "packer",
    "elevated_password": "packer",
    "inline": [
        "choco install netfx-4.5.2-devpack"
    ]}
  ],
  "post-processors": [{
    "type": "vagrant",
    "keep_input_artifact": false,
    "output": "windows_2008_r2_{{.Provider}}.box",
    "vagrantfile_template": "windows_2008_r2/Vagrantfile.template"
  }]
}