Remove-EMET52.ps1

#Requires -Version 4.0
#Requires -RunAsAdministrator

configuration RemoveEMET52 {
    param
    (
        [string[]]$NodeName = 'localhost'
    )
    Node $NodeName
    {

        Script DownloadEMET52 {
            GetScript = {
                @{
                    GetScript = $GetScript
                    SetScript = $SetScript
                    TestScript = $TestScript
                    Result  = $(Test-Path (Join-Path -Path ([System.IO.Path]::GetTempPath()) -ChildPath  'EMET 5.2 Setup.msi'));
                }
            }
            SetScript = {
                try {
                    $tmpfile = [System.IO.Path]::GetTempFileName()
                    $null = Invoke-WebRequest -Uri 'http://download.microsoft.com/download/7/0/A/70AF5150-10DD-4838-ACFC-C4390B05620A/EMET%205.2%20Setup.msi' `
                                        -OutFile $tmpfile -ErrorAction Stop
                    Write-Verbose -Message 'Sucessfully downloaded EMET 5.2 MSI Package'
                    Unblock-File -Path $tmpfile -ErrorAction Stop
                    $package = Join-Path -Path (Split-Path -Path $tmpfile -Parent) -ChildPath 'EMET 5.2 Setup.msi' -ErrorAction SilentlyContinue
                    if (Test-Path $package) {
                        Remove-Item -Path $package -Force -ErrorAction Stop
                    }
                    $tmpfile | Rename-Item -NewName 'EMET 5.2 Setup.msi' -Force -ErrorAction Stop
                } catch {
                    Write-Verbose -Message "Something went wrong $($_.Exception.Message)"
                }
            }
            TestScript = { 
                $MSI = Join-Path -Path ([System.IO.Path]::GetTempPath()) -ChildPath 'EMET 5.2 Setup.msi' -ErrorAction SilentlyContinue
                if (-not(Test-Path -Path $MSI -PathType Leaf)) {
                    return $false
                }
                if(
                    (Get-FileHash -Path $MSI -Algorithm SHA256).Hash -eq '7125CA4ACC33BDDF46657039277D8FDE752618A00B51604D2890E9E429EA4DD3' -and
                    (Get-AuthenticodeSignature -FilePath $MSI).Status.value__ -eq 0 # Valid
                ) {
                    Write-Verbose -Message 'Successfully found a valid signed EMET 5.2 package'
                    return $true
                } else {
                    Write-Verbose -Message 'A valid signed package of EMET 5.2 was not found'
                    return $false
                }
            }
        }
        Package UninstallEMET52msi {
            Name = 'EMET 5.2';
            Path = 'C:\Windows\Temp\EMET 5.2 Setup.msi';
            ProductId = '{F4DCB44D-F072-43A1-B4A5-57619C7B22D2}';
            Arguments = '/norestart' ;
            Ensure = 'Absent';
            DependsOn = "[Script]DownloadEMET52"
        }
    }
}

if (-not(test-path -Path C:\DSC -PathType Container)){
    mkdir C:\DSC
}
# Compile the configuration file to a MOF format
RemoveEMET52 -OutputPath C:\DSC

# Run the configuration on localhost
Start-DscConfiguration -Path C:\DSC -ComputerName localhost -Verbose -Force -Wait