Configuring Attack Surface Reduction Rules in Microsoft Defender for Endpoint Without Breaking Apps

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Understanding Attack Surface Reduction Rules in MDE

Attack Surface Reduction (ASR) rules help prevent malware attacks by blocking potential exploits at the endpoint level. However, common app break scenarios can occur due to these protective measures.

Running ASR Rules in Audit Mode

Before enforcing ASR rules, run them in Audit mode for two weeks to collect event data and identify potential application conflicts.

Reviewing ASR Audit Events

Access the Defender portal to review the audit events generated during this period. Identify any legitimate app blocks that need exclusions.

Adding Exclusions for Legitimate Apps

Create targeted exclusions for apps that are falsely blocked by ASR rules to maintain application compatibility while still protecting your environment.

Recommended ASR Rule Baseline for Enterprise Environments

Follow best practices and recommendations for an effective ASR rule baseline in enterprise environments. This will ensure optimal protection with minimal app conflicts.

Conclusion

Protect your environment with Microsoft Defender for Endpoint’s Attack Surface Reduction (ASR) rules while ensuring application compatibility. Follow these steps to configure ASR rules effectively.

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Written by Mohammed Akhter

Founder of ITP Training. 50,000+ students trained across 30+ countries in Microsoft endpoint and cloud security. Learn more →