(TLP:CLEAR) CISA Guidance Explains How Cyber Decoys Strengthen Detection and Response

Summary: CISA has published Using Cyber Decoys to Strengthen Detection and Response, guidance to help defensive teams at varying maturity levels plan and implement decoy strategies. Cyber decoys are assets that appear to be legitimate systems, accounts, or data but are designed to distract adversaries, detect their presence, or facilitate collection of cyber threat intelligence. The guidance addresses a common gap: detecting adversaries who use legitimate credentials, native tools, and living-off-the-land (LOTL) techniques to move through an environment undetected. It introduces decoy concepts including tripwires, breadcrumbs, and honeytokens, and draws on the MITRE Engage and MITRE ATT&CK frameworks to offer practical, low-complexity steps for planning, deploying, and refining decoy operations.

Analyst Note: Decoys are well suited to water and wastewater environments, where defenders often lack the staffing to sift high volumes of alerts. Because a well-placed decoy has no legitimate reason to be touched, any interaction with it produces a high-fidelity alert with very few false positives, which helps reduce alert fatigue and surface post-compromise activity that credential-based intrusions and LOTL techniques would otherwise hide. CISA frames decoys as a complement to Zero Trust: assume an actor may gain some level of access, then plan to detect them once inside.

This guidance maps most directly to Fundamental 4: Implement System Monitoring for Threat Detection and Alerting, from WaterISAC’s 12 Cybersecurity Fundamentals for Water and Wastewater Utilities, since decoys are fundamentally a detection and alerting capability aimed at catching intruders already operating in the environment.

Original Source: https://www.cisa.gov/resources-tools/resources/using-cyber-decoys-strengthen-detection-and-response

Additional Reading:

• WaterISAC’s 12 Fundamentals for Water and Wastewater Utilities
• Adapting Zero Trust Principles to Operational Technology
• Identifying and Mitigating Living Off the Land Techniques
• Principles of Operational Technology Cyber Security

Related WaterISAC PIRs: 6 – 12