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Introduction:
Microsoft Defender for Identity (MDI) has launched a public preview for Automatic Windows Auditing Configuration, a transformative feature for identity threat detection and response (ITDR). This capability allows the MDI v3 sensor to autonomously apply and manage the precise Windows Advanced Audit Policy settings required for optimal security monitoring, eliminating a historically complex and error-prone manual process. By automating this foundational layer of identity security, organizations can immediately achieve full coverage and detect sophisticated attacks like credential theft and lateral movement without operational delay.
Learning Objectives:
- Understand the critical role of Windows Advanced Audit Policies in detecting identity-based attacks.
- Learn how to deploy and validate the MDI v3 sensor with Automatic Auditing Configuration.
- Gain actionable steps to verify audit policy settings and integrate logs with your SIEM.
- Explore advanced configurations and hardening techniques beyond the automated baseline.
- Develop a roadmap for transitioning from manual audit policy management to full automation.
You Should Know:
- Why Windows Auditing Was Your Identity Security’s Weakest Link
The cornerstone of detecting malicious activity in an Active Directory or hybrid environment is having the correct Windows security events logged. Attacks like Pass-the-Hash, Golden Ticket, and Kerberoasting leave traces in specific event IDs (e.g., 4624, 4768, 4769, 4672). Historically, configuring the necessary Advanced Audit Policy via Group Policy Objects (GPOs) or local policies was manual, inconsistent, and often incomplete due to domain complexity or fear of log volume. A single misconfiguration could create blind spots.
Step‑by‑step guide:
Manual Verification (Pre-Automation): To see your current, potentially flawed, audit policy, open an administrative Command Prompt on a domain controller or critical server.
auditpol /get /category:
Focus on categories like Logon/Logoff, Account Logon, Detailed Tracking, and Policy Change. Inconsistent settings across servers are a major red flag.
The Core Issue: Manually deploying the correct GPO requires linking it to the correct Organizational Units (OUs), managing security filtering, and ensuring precedence. The required settings are documented by Microsoft but are often not fully applied.
- Deploying the MDI v3 Sensor: The Gateway to Automation
The magic is enabled by the updated MDI sensor (version 3.x). This sensor must be installed on your Active Directory Domain Controllers, AD FS servers, and other identity components. The sensor already captures network traffic and analyzes events; now it can also configure the source.
Step‑by‑step guide:
- Navigate to the Microsoft Defender XDR portal > Settings > Identities.
- Under Sensors, download the latest v3 sensor setup package.
- On a Domain Controller, run the installer with administrative privileges. The installer will automatically register the sensor with your MDI instance using the provided access key.
- The sensor service (
Azure Advanced Threat Protection Sensor) will start. Within hours, if the sensor has the necessary permissions (local administrator), it will begin evaluating and applying the required audit policies.
3. Verifying the Automated Configuration
Trust but verify. After deployment, you must confirm the settings are applied correctly and that events are flowing.
Step‑by‑step guide:
Check Audit Policy via Sensor: The primary verification is within the MDI portal. Go to Configuration > Directory Services > select a sensor. The status of “Windows Event Logging” should show as Configured.
Local Command Verification: Re-run the auditpol command to see the applied changes. Key categories should show `Success and Failure` auditing enabled.
auditpol /get /category:"Logon/Logoff" /subcategory:"Filtering Platform Connection"
This subcategory, crucial for network sign-in events, should now be set.
Event Log Check: Open Event Viewer and navigate to Security logs. Look for a surge in specific, detailed events shortly after configuration. Use a PowerShell command to count critical event IDs:
Get-WinEvent -LogName Security -MaxEvents 100 | Group-Object Id -NoElement | Sort-Object Count -Descending
4. Integrating with Your SIEM and Log Analytics
Automated configuration is pointless if logs aren’t collected. MDI analyzes events locally, but for full visibility and correlation, forward these enriched security logs.
Step‑by‑step guide for Azure Sentinel/Log Analytics:
- Enable Azure Arc on your Domain Controllers if not already managed.
- Deploy the Azure Monitor Agent via Arc or directly.
- Create a Data Collection Rule (DCR) in Azure Monitor that targets your Domain Controllers.
- In the DCR, add a data source for Windows Security Events and select All Events or a custom set (e.g., Common event IDs 1-1102).
- The logs will flow to your designated Log Analytics Workspace. Run a test query:
SecurityEvent | where Computer contains "<DC_Name>" | where EventID in (4624, 4625, 4768, 4769, 4672) | top 100 by TimeGenerated
5. Advanced Hardening: Going Beyond the Automated Baseline
While MDI’s automation covers its needs, a defense-in-depth strategy requires additional logging. The automated policy is a baseline, not the ceiling.
Step‑by‑step guide for Additional GPOs:
- Create a new, separate GPO named “Z-Audit Advanced Hardening” and link it to Domain Controllers OU. Its settings will combine with MDI’s.
- Using the Group Policy Management Editor, navigate to:
Computer Configuration > Policies > Windows Settings > Security Settings > Advanced Audit Policy Configuration.
3. Consider enabling additional subcategories:
DS Access: `Audit Directory Service Changes` (Event 5136 for object modifications).
Privilege Use: `Audit Sensitive Privilege Use` (Event 4673).
Policy Change: `Audit Audit Policy Change` (Event 4715).
4. Critical PowerShell Command for Log Size Management: To prevent log loss, increase the Security log size via GPO or script:
wevtutil sl Security /ms:268435456 /ret:true
This sets the log to 256MB and enables overwrite as needed.
6. Troubleshooting and Rollback Procedures
What if the automation fails or causes issues? You need a controlled rollback plan.
Step‑by‑step guide:
Sensor Status: Check the sensor health in the MDI portal. Errors will be reported under sensor diagnostics.
Permission Issues: The sensor account needs local admin rights on the DC. Verify this.
Manual Rollback: To revert to a known state, you can manually apply a GPO with your desired audit settings. A GPO will take precedence. Alternatively, use `auditpol` in a script to set specific categories to No Auditing.
auditpol /set /subcategory:"Filtering Platform Connection" /success:disable /failure:disable
Disable the Feature: In the MDI portal under sensor settings, you can potentially turn off the automatic configuration capability for a specific sensor.
- The Future Roadmap: From Reactive to Proactive ITDR
With this foundational data automated, security teams can shift focus from configuration management to threat hunting and automation playbooks.
Step‑by‑step guide for Building a Detection:
- In Azure Sentinel or your SIEM, create a new analytics rule.
- Write a KQL query to detect a specific technique, like Kerberoasting (abuse of Kerberos service tickets):
SecurityEvent | where EventID == 4769 | where TicketEncryptionType == "0x17" // RC4 encryption, often weak | summarize Attempts = count(), TargetSPNs = make_set(ServiceName) by Account | where Attempts > 5
- Set a reasonable threshold and create an alert that triggers an automated response, such as disabling the user account or creating a ticket in ITSM.
What Undercode Say:
- Key Takeaway 1: This move by Microsoft signifies a strategic shift towards “self-healing” security infrastructure, where the monitoring tool autonomously ensures its own prerequisites are met. This drastically reduces the “time-to-value” and closes the window of exposure caused by misconfiguration.
- Key Takeaway 2: It fundamentally changes the role of the infrastructure/AD admin. The tedious, repetitive task of audit policy management is abstracted away, freeing them for more strategic security tasks. However, this also requires a deeper trust in the cloud agent and a thorough understanding of what it configures.
Analysis: The introduction of Automatic Windows Auditing Configuration is a subtle yet profound evolution in the ITDR market. It attacks the “silent failure” problem in security—where a tool is deployed but ineffective due to missing logs. By owning this layer, Microsoft not only improves MDI’s efficacy but also deepens its architectural moat within hybrid environments. Organizations should welcome this automation but must pair it with rigorous verification and enhanced log management strategies. The risk, though minimal, lies in over-reliance without understanding the underlying principles; security teams must maintain the knowledge to manually configure and audit these settings should the need arise.
Prediction:
Within the next 18-24 months, this automation model will become the standard expectation for all enterprise security monitoring tools that require specific host configurations. Competitors in the Endpoint Detection and Response (EDR) and Extended Detection and Response (XDR) space will follow suit with similar “auto-remediation” features for their own prerequisites, such as kernel driver permissions or script execution policies. This will accelerate the convergence of IT operations and security (ITSecOps), forcing a redefinition of traditional admin roles and leading to more integrated, autonomous security platforms that require less manual tuning but greater strategic oversight. The focus will shift entirely to interpreting alerts and building intelligent response playbooks, as the data collection foundation becomes a commoditized, automated utility.
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IT/Security Reporter URL:
Reported By: Gersonlevitz Microsoftsecurity – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
