New CISA Guidance Helps Critical Infrastructure Detect, Observe and Impede Malicious Cyber Activity

What happened

On 16 September 2026 the Cybersecurity and Infrastructure Security Agency (CISA) published "Using Cyber Decoys to Strengthen Detection and Response," the agency’s first guidance on deploying realistic decoy systems within critical infrastructure networks. The guide explains how decoys complement Zero Trust architectures and leverages the MITRE ATT&CK and MITRE Engage frameworks. It aims to improve detection of adversaries who use legitimate tools and credentials. No regulatory changes or penalties accompany the guidance.

Why it matters

Operators of critical infrastructure should assess their current detection gaps and consider adding decoy assets as a practical layer of defense, especially in high‑value network zones.

Business impact

Implementing decoy systems may require additional hardware, software licensing, and staff training, but can reduce dwell time of attackers and lower incident response costs.

Checklist

• Review the CISA cyber decoy guideHigh priority

  Download and read the "Using Cyber Decoys to Strengthen Detection and Response" document to understand recommended practices.

• Map decoy placement to high‑value assetsMedium priority

  Identify critical systems and network segments where decoys can be most effective.

• Integrate decoys with existing Zero Trust controlsMedium priority

  Ensure decoy traffic is monitored and alerts are routed to existing security operations workflows.

• Train staff on MITRE ATT&CK and Engage frameworksLow priority

  Provide basic training so defenders can interpret decoy alerts within the ATT&CK matrix.

Who reported it

Discussion