WDACConfig

0.3.3

Preloader.ps1

                                if (!$IsWindows) {

    Throw [System.PlatformNotSupportedException] 'The WDACConfig module only runs on Windows operation systems.'

}

# Specifies that the WDACConfig module requires Administrator privileges

#Requires -RunAsAdministrator

# Create tamper resistant global variables (if they don't already exist) - They are automatically imported in the caller's environment

try {

    if ((Test-Path -Path 'Variable:\MSFTRecommendedBlockRulesURL') -eq $false) { New-Variable -Name 'MSFTRecommendedBlockRulesURL' -Value 'https://raw.githubusercontent.com/MicrosoftDocs/windows-itpro-docs/public/windows/security/application-security/application-control/windows-defender-application-control/design/applications-that-can-bypass-wdac.md' -Option 'Constant' -Scope 'Global' -Description 'User Mode block rules' -Force }

    if ((Test-Path -Path 'Variable:\MSFTRecommendedDriverBlockRulesURL') -eq $false) { New-Variable -Name 'MSFTRecommendedDriverBlockRulesURL' -Value 'https://raw.githubusercontent.com/MicrosoftDocs/windows-itpro-docs/public/windows/security/application-security/application-control/windows-defender-application-control/design/microsoft-recommended-driver-block-rules.md' -Option 'Constant' -Scope 'Global' -Description 'Kernel Mode block rules' -Force }

    if ((Test-Path -Path 'Variable:\UserTempDirectoryPath') -eq $false) { New-Variable -Name 'UserTempDirectoryPath' -Value ([System.IO.Path]::GetTempPath()) -Option 'Constant' -Scope 'Global' -Description 'Properly and securely retrieved Temp Directory' -Force }

    if ((Test-Path -Path 'Variable:\UserAccountDirectoryPath') -eq $false) { New-Variable -Name 'UserAccountDirectoryPath' -Value ((Get-CimInstance Win32_UserProfile -Filter "SID = '$([System.Security.Principal.WindowsIdentity]::GetCurrent().User.Value)'").LocalPath) -Option 'Constant' -Scope 'Global' -Description 'Securely retrieved User profile directory' -Force }

    if ((Test-Path -Path 'Variable:\Requiredbuild') -eq $false) { New-Variable -Name 'Requiredbuild' -Value '22621.2428' -Option 'Constant' -Scope 'Script' -Description 'Minimum required OS build number' -Force }

    if ((Test-Path -Path 'Variable:\OSBuild') -eq $false) { New-Variable -Name 'OSBuild' -Value ([System.Environment]::OSVersion.Version.Build) -Option 'Constant' -Scope 'Script' -Description 'Current OS build version' -Force }

    if ((Test-Path -Path 'Variable:\UBR') -eq $false) { New-Variable -Name 'UBR' -Value (Get-ItemPropertyValue -Path 'HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion' -Name 'UBR') -Option 'Constant' -Scope 'Script' -Description 'Update Build Revision (UBR) number' -Force }

    if ((Test-Path -Path 'Variable:\FullOSBuild') -eq $false) { New-Variable -Name 'FullOSBuild' -Value "$OSBuild.$UBR" -Option 'Constant' -Scope 'Script' -Description 'Create full OS build number as seen in Windows Settings' -Force }

    if ((Test-Path -Path 'Variable:\ModuleRootPath') -eq $false) { New-Variable -Name 'ModuleRootPath' -Value ($PSScriptRoot) -Option 'Constant' -Scope 'Global' -Description 'Storing the value of $PSScriptRoot in a global constant variable to allow the internal functions to use it when navigating the module structure' -Force }

    if ((Test-Path -Path 'Variable:\CISchemaPath') -eq $false) { New-Variable -Name 'CISchemaPath' -Value "$Env:SystemDrive\Windows\schemas\CodeIntegrity\cipolicy.xsd" -Option 'Constant' -Scope 'Global' -Description 'Storing the path to the WDAC Code Integrity Schema XSD file' -Force }

}

catch {

    Throw [System.InvalidOperationException] 'Could not set the required global variables.'

}

# Make sure the current OS build is equal or greater than the required build number

if (-NOT ([System.Decimal]$FullOSBuild -ge [System.Decimal]$Requiredbuild)) {

    Throw [System.PlatformNotSupportedException] "You are not using the latest build of the Windows OS. A minimum build of $Requiredbuild is required but your OS build is $FullOSBuild`nPlease go to Windows Update to install the updates and then try again."

}

# Loop through all the relevant files in the module

foreach ($File in (Get-ChildItem -Recurse -File -Path $ModuleRootPath -Include '*.ps1', '*.psm1')) {

    # Get the signature of the current file

    [System.Management.Automation.Signature]$Signature = Get-AuthenticodeSignature -FilePath $File

    # Ensure that they are code signed properly and have not been tampered with.

    if (($Signature.SignerCertificate.Thumbprint -eq '1c1c9082551b43eec17c0301bfb2f27031a4d8c8') -and ($Signature.Status -in 'Valid', 'UnknownError')) {

        # If the file is signed properly, then continue to the next file

    }

    else {

        Throw [System.Security.SecurityException] "The module has been tampered with, signature status of the file $($File.FullName) is $($Signature.Status)"

    }

}

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