CISA Releases Guidance on Cyber Decoy Systems

As a complement to Zero Trust, CISA recommends targeted cyber decoys: Decoy systems are designed to distract and expose attackers within the network and provide valuable threat intelligence.

Complement to Zero Trust Architectures

The US Cybersecurity and Infrastructure Security Agency (CISA) has released new guidance on implementing cyber decoy systems, primarily aimed at operators of critical infrastructure. While Zero Trust models continuously verify all access, decoy approaches begin at the point where an adversary has already gained an initial level of access to the enterprise network. Cyber decoys are seemingly legitimate systems, user accounts, or datasets designed to distract threat actors, detect their presence early, and gather valuable Cyber Threat Intelligence (CTI). Because regular users do not interact with these prepared resources, access attempts generate particularly precise high-fidelity alerts with a low rate of false positives.

Defending Against Living-off-the-Land Attacks

According to CISA, decoy techniques can be introduced incrementally, cost-effectively, and scalably without requiring major architectural changes to existing systems. Through strategically placed decoys, attackers are redirected to fake data, misled during network reconnaissance, or enticed to download non-critical data. In controlled environments, security teams can observe attacker methods under realistic conditions. CISA emphasizes that many organizations face significant challenges identifying attackers when they use stolen, valid credentials or native operating system tools (Living off the Land, LOTL) to move laterally within the network.

Three Phases for Successful Deployment

The guidance breaks down the operational deployment of lures, tripwires, honeytokens, and honeypots into a three-stage process consisting of preparation, execution, and evaluation:

• Preparation: Analysis of the threat landscape, definition of operational goals, planning of the desired perception on the attacker side, and definition of success metrics and deployment channels.
• Execution: Technical implementation and monitoring of decoy elements within the network.
• Evaluation: Conversion of gathered raw data into actionable intelligence and continuous adjustment of defenses based on the analysis of successes and failures.

(Editorial Team)