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The US Cybersecurity and Infrastructure Security Agency (CISA) has released new guidance encouraging organizations, particularly critical infrastructure operators, to deploy cyber decoys as an additional layer of defense against attackers who manage to enter corporate networks.

Cyber decoys are fake systems, accounts, credentials, files, or other resources designed to appear legitimate to an attacker. Unlike traditional security controls focused primarily on preventing unauthorized access, decoys assume that an adversary may already be inside the environment.

This makes them particularly useful alongside Zero Trust architectures. Zero Trust continuously verifies access to resources, while decoys help reveal attackers who have already obtained legitimate credentials or established a foothold.

One of the main advantages of decoys is their ability to generate high-confidence security alerts.

Organizations can place fake resources in locations where legitimate users would have little or no reason to interact with them. If someone attempts to access one of those resources, the activity immediately becomes suspicious.

CISA recommends several types of deception technologies, including honeypots, honeytokens, tripwires, decoy artifacts, and lures. These can range from fake credentials and documents to entire systems designed to imitate production infrastructure.

For example, defenders could place credentials that appear to provide access to an important server but are never used by legitimate applications or employees. If those credentials are suddenly used, security teams have a strong indication that an attacker may have discovered and attempted to exploit them.

Decoys can also deliberately mislead reconnaissance. An attacker mapping a compromised network might encounter fake servers, databases, accounts, or datasets and incorrectly conclude that they represent valuable targets.

Cyber deception can provide more than detection.

Organizations can redirect attackers toward controlled environments where defenders can observe their behavior without exposing real production systems.

Security teams may then collect information about commands, tools, lateral movement techniques, credential abuse, and data-access attempts. This information can become valuable cyber threat intelligence and help defenders understand how an intrusion is progressing.

Decoy datasets can even be designed to encourage attackers to spend time downloading large quantities of meaningless or non-sensitive information, increasing the attacker’s workload while giving defenders additional time to detect the intrusion.

CISA recommends treating cyber deception as an operational process rather than simply deploying a honeypot and waiting for attackers.

The agency divides the process into preparation, execution, and understanding.

During preparation, organizations should evaluate their threat landscape, determine what they want attackers to perceive, establish deployment methods, and define measurable objectives.

The execution phase involves deploying the selected decoys and monitoring how adversaries interact with them.

Finally, organizations should analyze the resulting telemetry and threat intelligence, determine what worked, identify weaknesses in the deception strategy, and use those lessons to improve future deployments.

CISA highlights cyber deception as particularly valuable against attackers using legitimate credentials and living-off-the-land (LOTL) techniques.

These attacks can be difficult for conventional security tools to detect because attackers may use legitimate administrative utilities rather than introducing obvious malware.

An attacker authenticated with stolen credentials and using standard operating-system tools may appear similar to a legitimate administrator.

Interacting with a resource that no legitimate employee or application should ever access creates a much stronger detection signal.

This is where cyber decoys can provide significant value: rather than attempting to determine whether every legitimate-looking action is malicious, defenders create resources where virtually any interaction is suspicious.

CISA describes these techniques as incremental, scalable, and potentially cost-effective because organizations can introduce them without redesigning their entire security architecture.

As attackers increasingly rely on stolen identities, legitimate tools, and stealthier lateral movement, deception technologies provide defenders with another way to identify intrusions that traditional perimeter defenses may have already missed.