Network-25537: Threat intelligence is Enabled in Deny Mode on Azure Firewall

src/powershell/tests/Test-Assessment.25537.md

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+Azure Firewall Threat intelligence-based filtering alerts and denies traffic from/to known malicious IP addresses, FQDNs, and URLs. The IP addresses, domains, and URLs are sourced from the Microsoft Threat Intelligence feed, which includes multiple sources including the Microsoft Cyber Security team. When threat intelligence-based filtering is enabled, Azure Firewall evaluates traffic against the threat intelligence rules before applying NAT, network, or application rules. This check verifies that Threat Intelligence feature is enabled in “Alert and Deny” mode in the Azure Firewall policy configuration. The check will fail if Threat Intelligence is either “Disabled” or if it is not configured in “Alert and Deny” mode, in the firewall policy attached to the firewall. 
+
+**Remediation action**
+
+- [Please check this article for guidance on how to enable Threat Intelligence in “Alert and Deny” mode in the Azure Firewall Policy.](https://learn.microsoft.com/en-us/azure/firewall-manager/threat-intelligence-settings)
+<!--- Results --->
+%TestResult%

src/powershell/tests/Test-Assessment.25537.ps1

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+<#
+.SYNOPSIS
+    Validates Threat intelligence is Enabled in Deny Mode on Azure Firewall.
+.DESCRIPTION
+    This test validates that Azure Firewall Policies have Threat Intelligence enabled in Deny mode.
+    Checks all firewall policies in the subscription and reports their threat intelligence status.
+.NOTES
+    Test ID: 25537
+    Category: Internet Access Control
+    Required API: Azure Firewall Policies
+#>
+
+function Test-Assessment-25537 {
+    [ZtTest(
+        Category = 'Internet Access Control',
+        ImplementationCost = 'Low',
+        MinimumLicense = ('Azure_Firewall_Standard','Azure_Firewall_Premium'),
+        Pillar = 'Network',
+        RiskLevel = 'High',
+        SfiPillar = 'Protect networks',
+        TenantType = ('Workforce'),
+        TestId = 25537,
+        Title = 'Threat intelligence is Enabled in Deny Mode on Azure Firewall',
+        UserImpact = 'Low'
+    )]
+    [CmdletBinding()]
+    param()
+
+    Write-PSFMessage '🟦 Start' -Tag Test -Level VeryVerbose
+
+    #region Authentication Check
+    try {
+        $accessToken = Get-AzAccessToken -AsSecureString -ErrorAction SilentlyContinue -WarningAction SilentlyContinue
+    }
+    catch {
+        Write-PSFMessage $_.Exception.Message -Tag Test -Level Error
+    }
+
+    if (!$accessToken) {
+        Write-PSFMessage "Azure authentication token not found." -Level Warning
+        Add-ZtTestResultDetail -SkippedBecause NotConnectedAzure
+        return
+    }
+    #endregion Authentication Check
+
+    #region Data Collection
+    Write-ZtProgress `
+        -Activity 'Azure Firewall Threat Intelligence' `
+        -Status 'Enumerating Firewall Policies'
+
+    try {
+        $policies = Get-AzResource -ResourceType "Microsoft.Network/firewallPolicies" -ErrorAction Stop
+    }
+    catch {
+        Write-PSFMessage $_.Exception.Message -Tag Test -Level Error
+        Add-ZtTestResultDetail -SkippedBecause NoAzureAccess
+        return
+    }
+    #endregion Data Collection
+
+    #region Assessment Logic
+    $passed = $false
+    $testResultMarkdown = ""
+    $results = @()
+
+    if (-not $policies) {
+        $testResultMarkdown = "No Azure Firewall Policies were found in this subscription."
+        Add-ZtTestResultDetail `
+            -TestId '25537' `
+            -Title 'Threat intelligence is Enabled in Deny Mode on Azure Firewall' `
+            -Status $false `
+            -Result $testResultMarkdown
+        return
+    }
+
+    $results = @()
+
+    foreach ($policyResource in $policies) {
+        $policy = Get-AzFirewallPolicy `
+            -Name $policyResource.Name `
+            -ResourceGroupName $policyResource.ResourceGroupName `
+            -ErrorAction SilentlyContinue
+
+        $mode = $policy.ThreatIntelMode
+
+        $result = switch ($mode) {
+            'Deny'  { '✅ Enabled (Alert and Deny)' }
+            'Alert' { '❌ Alert only' }
+            'Off'   { '❌ Disabled' }
+            default { '❌ Not configured' }
+        }
+
+        $results += [PSCustomObject]@{
+            PolicyName      = $policy.Name
+            ResourceGroup   = $policy.ResourceGroupName
+            ThreatIntelMode = $mode
+            Result          = $result
+        }
+    }
+    #endregion Data Collection
+
+    #region Assessment Logic Evaluation
+    $failedPolicies = $results | Where-Object { $_.ThreatIntelMode -ne 'Deny' }
+    $passed = ($failedPolicies.Count -eq 0)
+
+    if ($passed) {
+        $testResultMarkdown = "Threat Intelligence is enabled in **Alert and Deny** mode for all Azure Firewall Policies.`n`n%TestResult%"
+    } else {
+        $testResultMarkdown = "One or more Azure Firewall Policies do **not** have Threat Intelligence enabled in **Alert and Deny** mode.`n`n%TestResult%"
+    }
+    #endregion Assessment Logic Evaluation
+
+    #region Report Generation
+    $mdInfo  = "## Azure Firewall Threat Intelligence Status`n`n"
+    $mdInfo += "Policy Name | Resource Group | Threat Intel Mode | Result |`n"
+    $mdInfo += "| :--- | :--- | :--- | :---: |`n"
+
+    foreach ($item in $results | Sort-Object PolicyName) {
+        $mdInfo += "| $($item.PolicyName) | $($item.ResourceGroup) | $($item.ThreatIntelMode) | $($item.Result) |`n"
+    }
+
+    $testResultMarkdown = $testResultMarkdown -replace "%TestResult%", $mdInfo
+
+    # --- Final result (NO AppliesTo) ---
+    Add-ZtTestResultDetail `
+        -TestId '25537' `
+        -Title 'Azure Firewall Threat Intelligence is enabled in Alert and Deny mode' `
+        -Status $passed `
+        -Result $testResultMarkdown
+}