Deploying Attack Surface Reduction (ASR) Rules with ASR Rule Inspector

You Should Know:

Deploying Attack Surface Reduction (ASR) rules is a critical step in enhancing your organization’s security posture. The ASR Rule Inspector, created by Roy Klooster, is a powerful tool that helps verify the configuration and deployment of ASR rules, as well as the proper setup of Controlled Folder Access (CFA).

Steps to Use ASR Rule Inspector:

1. Download the Tool:

• Visit the GitHub repository: ASR Rule Inspector
• Download the script to your local machine.

2. Run the Script:

• Open PowerShell with administrative privileges.
• Navigate to the directory where the script is located.
• Execute the script using the following command:

  .\ASR_Rule_Inspector.ps1
  

3. Verify ASR Rules:

• The script will output the current status of ASR rules on the device.
• Ensure that the rules are configured as per your organization’s security policy.

4. Check Controlled Folder Access (CFA):

• The script also verifies the configuration of CFA.
• Make sure that the necessary folders are protected and exclusions are properly set.

5. Review and Act:

• Review the output for any discrepancies.
• Adjust the ASR rules and CFA settings as needed.

Example Commands:

• To check the current ASR rules status:

  Get-MpPreference | Select-Object -ExpandProperty AttackSurfaceReductionRules_Ids
  

• To enable a specific ASR rule:

  Set-MpPreference -AttackSurfaceReductionRules_Ids <RuleID> -AttackSurfaceReductionRules_Actions Enabled
  

• To configure Controlled Folder Access:

  Set-MpPreference -EnableControlledFolderAccess Enabled
  

What Undercode Say:

Deploying and verifying ASR rules is essential for mitigating various attack vectors. The ASR Rule Inspector simplifies this process by providing a clear overview of your current configuration. Regularly reviewing and updating your ASR rules and CFA settings ensures that your defenses remain robust against evolving threats.

For more detailed guidance, refer to the official Microsoft documentation on ASR rules and Controlled Folder Access.

References:

Reported By: Beingageek Attacksurfacereduction – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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