Remove-WDACConfig.psm1
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#Requires -RunAsAdministrator function Remove-WDACConfig { [CmdletBinding( DefaultParameterSetName = "Remove Signed Policies", SupportsShouldProcess = $true, PositionalBinding = $false, ConfirmImpact = 'High' )] Param( [Parameter(Mandatory = $false, ParameterSetName = "Remove Signed Policies")][Switch]$RemoveSignedPolicies, [Parameter(Mandatory = $false, ParameterSetName = "Remove Policies")][Switch]$RemovePolicies, [ValidatePattern('\.xml$')] [ValidateScript({ Test-Path $_ -PathType 'Leaf' }, ErrorMessage = "The path you selected is not a file path.")] [parameter(Mandatory = $true, ParameterSetName = "Remove Signed Policies", ValueFromPipelineByPropertyName = $true)][System.String[]]$PolicyPaths, [ValidateScript({ try { # TryCatch to show a custom error message instead of saying input is null when personal store is empty ((Get-ChildItem -ErrorAction Stop -Path 'Cert:\CurrentUser\My').Subject.Substring(3)) -contains $_ } catch { Write-Error -Message "A certificate with the provided common name doesn't exist in the personal store of the user certificates." } # this error msg is shown when cert CN is not available in the personal store of the user certs }, ErrorMessage = "A certificate with the provided common name doesn't exist in the personal store of the user certificates." )] [parameter(Mandatory = $true, ParameterSetName = "Remove Signed Policies", ValueFromPipelineByPropertyName = $true)] [System.String]$CertCN, # https://stackoverflow.com/questions/76143006/how-to-prevent-powershell-validateset-argument-completer-from-suggesting-the-sam/76143269 [ArgumentCompleter({ param($commandName, $parameterName, $wordToComplete, $commandAst, $fakeBoundParameters) $candidates = [PolicyIDz]::new().GetValidValues() $existing = $commandAst.FindAll({ $args[0] -is [System.Management.Automation.Language.StringConstantExpressionAst] }, $false ).Value Compare-Object -PassThru $candidates $existing | Where-Object SideIndicator -eq '<=' })] [ValidateScript({ if ($_ -notin [PolicyIDz]::new().GetValidValues()) { throw "Invalid policy ID: $_" } $true })] [Parameter(Mandatory = $false, ParameterSetName = "Remove Policies")][System.String[]]$PolicyIDs, # https://stackoverflow.com/questions/76143006/how-to-prevent-powershell-validateset-argument-completer-from-suggesting-the-sam/76143269 [ArgumentCompleter({ param($commandName, $parameterName, $wordToComplete, $commandAst, $fakeBoundParameters) $candidates = [PolicyNamez]::new().GetValidValues() $existing = $commandAst.FindAll({ $args[0] -is [System.Management.Automation.Language.StringConstantExpressionAst] }, $false ).Value (Compare-Object -PassThru $candidates $existing | Where-Object SideIndicator -eq '<='). ForEach({ if ($_ -match ' ') { "'{0}'" -f $_ } else { $_ } }) })] [ValidateScript({ if ($_ -notin [PolicyNamez]::new().GetValidValues()) { throw "Invalid policy name: $_" } $true })] [Parameter(Mandatory = $false, ParameterSetName = "Remove Policies")][System.String[]]$PolicyNames, [ValidatePattern('\.exe$')] [ValidateScript({ # Setting the minimum version of SignTool that is allowed to be executed as well as other checks [System.Version]$WindowsSdkVersion = '10.0.22621.755' (((get-item -Path $_).VersionInfo).ProductVersionRaw -ge $WindowsSdkVersion) (((get-item -Path $_).VersionInfo).FileVersionRaw -ge $WindowsSdkVersion) ((get-item -Path $_).VersionInfo).CompanyName -eq 'Microsoft Corporation' ((Get-AuthenticodeSignature -FilePath $_).Status -eq 'Valid') ((Get-AuthenticodeSignature -FilePath $_).StatusMessage -eq 'Signature verified.') }, ErrorMessage = "The SignTool executable was found but couldn't be verified. Please download the latest Windows SDK to get the newest SignTool executable. Official download link: http://aka.ms/WinSDK")] [parameter(ValueFromPipelineByPropertyName = $true)] [System.String]$SignToolPath, [Parameter(Mandatory = $false)][Switch]$SkipVersionCheck ) begin { # Importing resources such as functions by dot-sourcing so that they will run in the same scope and their variables will be usable . "$psscriptroot\Resources.ps1" # Stop operation as soon as there is an error, anywhere, unless explicitly specified otherwise $ErrorActionPreference = 'Stop' if (-NOT $SkipVersionCheck) { . Update-self } # argument tab auto-completion and ValidateSet for Policy names Class PolicyNamez : System.Management.Automation.IValidateSetValuesGenerator { [System.String[]] GetValidValues() { $PolicyNamez = ((CiTool -lp -json | ConvertFrom-Json).Policies | Where-Object { $_.IsSystemPolicy -ne "True" }).Friendlyname return [System.String[]]$PolicyNamez } } # argument tab auto-completion and ValidateSet for Policy IDs Class PolicyIDz : System.Management.Automation.IValidateSetValuesGenerator { [System.String[]] GetValidValues() { $PolicyIDz = ((CiTool -lp -json | ConvertFrom-Json).Policies | Where-Object { $_.IsSystemPolicy -ne "True" }).policyID return [System.String[]]$PolicyIDz } } } process { if ($RemoveSignedPolicies) { foreach ($PolicyPath in $PolicyPaths) { ######################## Sanitize the policy file by removing SupplementalPolicySigners ######################## $xml = [xml](Get-Content $PolicyPath) $SuppSingerIDs = $xml.SiPolicy.SupplementalPolicySigners.SupplementalPolicySigner.SignerId $PolicyName = ($xml.SiPolicy.Settings.Setting | Where-Object { $_.provider -eq "PolicyInfo" -and $_.valuename -eq "Name" -and $_.key -eq "Information" }).value.string if ($SuppSingerIDs) { Write-host "`n$($SuppSingerIDs.count) SupplementalPolicySigners have been found in $PolicyName policy, removing them now..." -ForegroundColor Yellow $SuppSingerIDs | ForEach-Object { $PolContent = Get-Content -Raw -Path $PolicyPath $PolContent -match "<Signer ID=`"$_`"[\S\s]*</Signer>" | Out-Null $PolContent = $PolContent -replace $Matches[0], "" Set-Content -Value $PolContent -Path $PolicyPath } $PolContent -match "<SupplementalPolicySigners>[\S\s]*</SupplementalPolicySigners>" | Out-Null $PolContent = $PolContent -replace $Matches[0], "" Set-Content -Value $PolContent -Path $PolicyPath # remove empty lines from the entire policy file (Get-Content -Path $PolicyPath) | Where-Object { $_.trim() -ne "" } | set-content -Path $PolicyPath -Force Write-host "Policy successfully sanitized and all SupplementalPolicySigners have been removed." -ForegroundColor Green } else { Write-host "`nNo sanitization required because no SupplementalPolicySigners have been found in $PolicyName policy." -ForegroundColor Green } Set-RuleOption -FilePath $PolicyPath -Option 6 $PolicyID = $xml.SiPolicy.PolicyID ConvertFrom-CIPolicy $PolicyPath "$PolicyID.cip" | Out-Null # Configure the parameter splat $ProcessParams = @{ 'ArgumentList' = 'sign', '/v' , '/n', "`"$CertCN`"", '/p7', '.', '/p7co', '1.3.6.1.4.1.311.79.1', '/fd', 'certHash', ".\$PolicyID.cip" 'FilePath' = ($SignToolPath ? (Get-SignTool -SignToolExePath $SignToolPath) : (Get-SignTool)) 'NoNewWindow' = $true 'Wait' = $true } # Sign the files with the specified cert Start-Process @ProcessParams Remove-Item ".\$PolicyID.cip" -Force Rename-Item "$PolicyID.cip.p7" -NewName "$PolicyID.cip" -Force CiTool --update-policy ".\$PolicyID.cip" -json Write-host "`n`nPolicy with the following details has been Re-signed and Re-deployed in Unsigned mode:" -ForegroundColor Green Write-Output "PolicyName = $PolicyName" Write-Output "PolicyGUID = $PolicyID`n" } } if ($RemovePolicies) { # If IDs were supplied by user foreach ($ID in $PolicyIDs ) { citool --remove-policy "{$ID}" -json } # If names were supplied by user foreach ($PolicyName in $PolicyNames) { $NameID = ((CiTool -lp -json | ConvertFrom-Json).Policies | Where-Object { $_.FriendlyName -eq $PolicyName }).PolicyID citool --remove-policy "{$NameID}" -json } } } <# .SYNOPSIS Removes Signed and unsigned deployed WDAC policies (Windows Defender Application Control) .LINK https://github.com/HotCakeX/Harden-Windows-Security/wiki/WDACConfig .DESCRIPTION Using official Microsoft methods, Removes Signed and unsigned deployed WDAC policies (Windows Defender Application Control) .COMPONENT Windows Defender Application Control .FUNCTIONALITY Using official Microsoft methods, Removes Signed and unsigned deployed WDAC policies (Windows Defender Application Control) .PARAMETER RemoveSignedPolicies Remove Signed WDAC Policies .PARAMETER RemovePolicies Removes Unsigned deployed WDAC policies as well as Signed deployed Supplemental WDAC policies .PARAMETER SkipVersionCheck Can be used with any parameter to bypass the online version check - only to be used in rare cases #> } # Set PSReadline tab completion to complete menu for easier access to available parameters - Only for the current session Set-PSReadlineKeyHandler -Key Tab -Function MenuComplete # argument tab auto-completion for Certificate common name $ArgumentCompleterCertificateCN = { $CNs = (Get-ChildItem -Path 'Cert:\CurrentUser\My').Subject.Substring(3) | Where-Object { $_ -NotLike "*, DC=*" } | ForEach-Object { if ($_ -like "*CN=*") { $_ -match "CN=(?<cn>[^,]+)" | Out-Null return $Matches['cn'] } else { return $_ } } $CNs | foreach-object { return "`"$_`"" } } Register-ArgumentCompleter -CommandName "Remove-WDACConfig" -ParameterName "CertCN" -ScriptBlock $ArgumentCompleterCertificateCN # argument tab auto-completion for Policy Paths to show only .xml files and only suggest files that haven't been already selected by user # https://stackoverflow.com/questions/76141864/how-to-make-a-powershell-argument-completer-that-only-suggests-files-not-already/76142865 Register-ArgumentCompleter ` -CommandName Remove-WDACConfig ` -ParameterName PolicyPaths ` -ScriptBlock { # Get the current command and the already bound parameters param($commandName, $parameterName, $wordToComplete, $commandAst, $fakeBoundParameters) # Find all string constants in the AST that end in ".xml" $existing = $commandAst.FindAll({ $args[0] -is [System.Management.Automation.Language.StringConstantExpressionAst] -and $args[0].Value -like '*.xml' }, $false ).Value # Get the xml files in the current directory Get-ChildItem -Filter *.xml | ForEach-Object { # Check if the file is already selected if ($_.FullName -notin $existing) { # Return the file name with quotes "`"$_`"" } } } # argument tab auto-completion for Certificate Path to show only .cer files $ArgumentCompleterCertPath = { Get-ChildItem | where-object { $_.extension -like '*.cer' } | foreach-object { return "`"$_`"" } } Register-ArgumentCompleter -CommandName "Remove-WDACConfig" -ParameterName "CertPath" -ScriptBlock $ArgumentCompleterCertPath # argument tab auto-completion for Certificate Path to show only .cer files $ArgumentCompleterSignToolPath = { Get-ChildItem | where-object { $_.extension -like '*.exe' } | foreach-object { return "`"$_`"" } } Register-ArgumentCompleter -CommandName "Remove-WDACConfig" -ParameterName "SignToolPath" -ScriptBlock $ArgumentCompleterSignToolPath |