Due to our requirement to build numerous sandbox devices quickly and effectively, I developed a small powershell script to assist and thought that I’d share it in case it was of use to anybody else:

<# .DESCRIPTION This script is used to quickly and easily configure sandbox devices in our corporate environment. Note that some options may need enabling or disabling depending on requirements, please review carefully. .VERSION Version 1.0 - Initial build/release There is a LOT that needs to be amended / added / hardened on this, so please bare this in mind. .USAGE This script is intended for use on Windows 11 builds, and should be ran after the initial OFF DOMAIN local Admin has been created, and Windows booted. .SCRIPT TASKS — Create User account — Defender onboarding — Disable NIC — Disable RDP — Set Background, Lock Screen and User Profile Picture for ALL USERS — Windows 11 hardening — Enable Windows Sandbox — Check for updates — Winget Upgrade All — Restart device #> ## Check that we are running as admin Write-Host "Checking for elevated permissions..." if (-NOT ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole(` [Security.Principal.WindowsBuiltInRole] "Administrator")) { # User is not an administrator Write-Warning "Insufficient permissions to run this script. We will attempt to elevate permissions." # Attempt elevated script run Start-Process .\Sandbox-build.ps1 -Verb RunAs Break } else { Write-Host "Code is running as administrator — go on executing the script..." -ForegroundColor Green } #### Define Variables $LockScreenLocation $WallpaperLocation = "C:\users\public\Public Pictures\background.png" $UserProfilePic $UserName = "IT_User" $UserDescription = "This is the local standard user account used for Sandbox testing" $NICName = "Ethernet" ##### #### Create our Local User Account New-LocalUser -Name $UserName -Description $UserDescription -NoPassword # We use no password to allow immediate login, as off network deemed minimal risk. #### #### MS Defender # cmd /c .\DefenderOnBoarding.cmd #### Disable Ethernet Network Adapter - We will use Wireless instead so that we can force Guest access. Disable-NetAdapter -Name $NICName -Confirm:$false #### #### Disable RDP Set-ItemProperty -Path "HKLM:\System\CurrentControlSet\Control\Terminal Server" -Name "fDenyTSConnections" -Type DWord -Value 1 Set-ItemProperty -Path "HKLM:\System\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" -Name "UserAuthentication" -Type DWord -Value 1 #### #### Now lets update all the things! ## Winget Upgrade and accept terms winget upgrade --all -h --accept-source-agreements --accept-package-agreements #### ## Windows Updates // Likely that this can be improved # Install required modules Install-PackageProvider -Name NuGet -MinimumVersion 2.8.5.201 -Force Install-Module pswindowsupdate -force Import-Module PSWindowsUpdate -force # End installing required modules #Get list of windows updates to install Get-WindowsUpdate #Install the updates Install-WindowsUpdate -AcceptAll -install -AutoReboot #### <# NEEDS WORK #### Set Background, Lock Screen and Profile Picture for all users. # Background Image Set-ItemProperty -path 'HKCU:\Control Panel\Desktop\' -name Wallpaper -value $WallpaperLocation Set-ItemProperty -path 'HKCU:\Control Panel\Desktop\' -name TileWallpaper -value "0" Set-ItemProperty -path 'HKCU:\Control Panel\Desktop\' -name WallpaperStyle -value "10" -Force # LockScreen Image #### #> #### WINDOWS HARDENING ## Credits to @JKerai1 :: https://github.com/jkerai1/WindowsHardeningScripts # Disable Autoplay reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows\Explorer" /v NoAutoplayfornonVolume /t REG_DWORD /d 1 /f reg add "HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer" /v NoDriveTypeAutoRun /t REG_DWORD /d 0xff /f reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer" /v NoDriveTypeAutoRun /t REG_DWORD /d 0xff /f reg add "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer" /v NoAutorun /t REG_DWORD /d 1 /f reg add "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer" /v NoRecentDocsHistory /t REG_DWORD /d 1 /f reg add "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer" /v NoRecentDocsMenu /t REG_DWORD /d 1 /f reg add "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer" /v ClearRecentDocsOnExit /t REG_DWORD /d 1 /f reg add "HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\AutoplayHandlers" /v DisableAutoplay /t REG_DWORD /d 1 /f # Disable AutoRun $regPath= "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer" $key0 = "NoAutorun" Set-ItemProperty -Path $regKey -Name $key0 -Value 1 -Type DWORD -Force Write-Host "The value of '$key0' has been set to 1." # Disable ClickOnceTrust reg add "HKLM\SOFTWARE\MICROSOFT\.NETFramework\Security\TrustManager\PromptingLevel" /v MyComputer /t REG_SZ /d "Disabled" /f reg add "HKLM\SOFTWARE\MICROSOFT\.NETFramework\Security\TrustManager\PromptingLevel" /v LocalIntranet /t REG_SZ /d "Disabled" /f reg add "HKLM\SOFTWARE\MICROSOFT\.NETFramework\Security\TrustManager\PromptingLevel" /v Internet /t REG_SZ /d "Disabled" /f reg add "HKLM\SOFTWARE\MICROSOFT\.NETFramework\Security\TrustManager\PromptingLevel" /v TrustedSites /t REG_SZ /d "Disabled" /f reg add "HKLM\SOFTWARE\MICROSOFT\.NETFramework\Security\TrustManager\PromptingLevel" /v UntrustedSites /t REG_SZ /d "Disabled" /f # Disable WifiSense If (!(Test-Path "HKLM:\Software\Microsoft\PolicyManager\default\WiFi\AllowWiFiHotSpotReporting")) { New-Item -Path "HKLM:\Software\Microsoft\PolicyManager\default\WiFi\AllowWiFiHotSpotReporting" -Force | Out-Null } Set-ItemProperty -Path "HKLM:\Software\Microsoft\PolicyManager\default\WiFi\AllowWiFiHotSpotReporting" -Name "Value" -Type DWord -Value 0 Set-ItemProperty -Path "HKLM:\Software\Microsoft\PolicyManager\default\WiFi\AllowAutoConnectToWiFiSenseHotspots" -Name "Value" -Type DWord -Value 0 # LSA Protection $regKey = "HKLM:\SYSTEM\CurrentControlSet\Control\Lsa" $key1 = "RunAsPPL" $key2 = "RunAsPPLBoot" # Check if the value exists and is already set to 1 if ((Test-Path $regKey) -and (Get-ItemProperty $regKey -Name $key1 -ErrorAction SilentlyContinue).$key1 -eq 1) { Write-Host "The value of '$key1' under $regKey is already set to 1." } else { try { # Set the value to 1 Set-ItemProperty -Path $regKey -Name $key1 -Value 1 -Type DWORD -Force Write-Host "The value of '$key1' under $regKey has been set to 1." } catch { Exit 1 } } if ((Test-Path $regKey) -and (Get-ItemProperty $regKey -Name $key2 -ErrorAction SilentlyContinue).$key1 -eq 1) { Write-Host "The value of '$key2' under $regKey is already set to 1." } else { try { # Set the value to 1 Set-ItemProperty -Path $regKey -Name $key2 -Value 1 -Type DWORD -Force Write-Host "The value of '$key2' under $regKey has been set to 1." } catch { Exit 1 } } # LSASS Hardening reg add "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\LSASS.exe" /v AuditLevel /t REG_DWORD /d 00000008 /f reg add "HKLM\SYSTEM\CurrentControlSet\Control\Lsa" /v RunAsPPL /t REG_DWORD /d 00000001 /f reg add "HKLM\SYSTEM\CurrentControlSet\Control\Lsa" /v DisableRestrictedAdmin /t REG_DWORD /d 00000000 /f reg add "HKLM\SYSTEM\CurrentControlSet\Control\Lsa" /v DisableRestrictedAdminOutboundCreds /t REG_DWORD /d 00000001 /f reg add "HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\WDigest" /v UseLogonCredential /t REG_DWORD /d 0 /f reg add "HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\WDigest" /v Negotiate /t REG_DWORD /d 0 /f reg add "HKLM\SOFTWARE\Policies\Microsoft\Windows\CredentialsDelegation" /v AllowProtectedCreds /t REG_DWORD /d 1 /f #### #### Reboot the device. cmd /c shutdown.exe /r /t 30 /c "Device prepped, Restarting to apply all changes."

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