SC-26: Decoys

Quick-reference card

What this control requires

SC-26 requires you to deploy decoy components within your systems that are specifically designed to attract, detect, and deflect adversary activity away from production assets. These components include honeypots, honeynets, and deception nets that mimic real system resources while serving no legitimate business function.

In practice, this means standing up isolated infrastructure that looks valuable to an attacker but exists solely to generate early-warning signals. Because decoys have no authorized users, any interaction with them is inherently suspicious and warrants investigation. The goal isn’t just detection; it’s gathering intelligence about attacker tactics, techniques, and targets while redirecting malicious activity away from the systems that support your mission.

Implementing SC-26 also requires supporting isolation measures. Decoy environments must be architected so that any malicious code introduced through attacker interaction can’t propagate to operational systems. Depending on how you deploy decoys, your legal team may need to review the approach before it goes live, particularly around data collection and monitoring implications.

Why it matters

Most organizations treat intrusion detection as a passive exercise, relying on signature-based tools and log analysis to catch threats after they’ve already interacted with production systems. SC-26 flips that model by placing purpose-built traps in the path of adversaries, creating a detection layer that doesn’t depend on known attack signatures.

The result is a proactive detection posture that fills a gap traditional monitoring often misses. Attackers conducting reconnaissance or lateral movement inside your network will eventually probe assets that appear valuable. Decoy components catch that behavior precisely because they have no legitimate traffic, so any interaction is a high-fidelity indicator of compromise.

Where this control becomes a governance concern is in audit readiness. SC-26 isn’t assigned to any NIST SP 800-53 baseline, which means many organizations overlook it entirely. But if your risk assessment identifies advanced persistent threats or insider threat vectors as relevant, auditors may ask whether you’ve evaluated deception-based controls and documented a rationale for inclusion or exclusion.

Specifically, organizations operating in sectors with elevated threat profiles, such as defense, critical infrastructure, or financial services, face scrutiny about whether their detection capabilities go beyond conventional perimeter defenses. Documenting your position on SC-26, even if you choose not to implement it, demonstrates that your security program accounts for deception as a detection strategy.

What attackers exploit

• Flat network architectures that allow undetected lateral movement between segments, giving adversaries time to reach high-value targets without triggering alerts
• Sole reliance on signature-based detection that misses novel attack vectors and zero-day exploits
• Absence of internal tripwires that would reveal reconnaissance activity happening inside the network perimeter
• Limited visibility into east-west traffic where attackers move between internal systems after initial compromise
• Lack of deception infrastructure that would force adversaries to interact with monitored assets, revealing their presence early

How to implement

The primary challenge with SC-26 isn’t the technology; it’s making decoys realistic enough to attract adversaries while keeping them fully isolated from production systems. A poorly designed decoy is worse than none at all because it wastes resources without generating useful intelligence.

For your organization

Start by identifying the assets and network segments where decoy components would provide the greatest detection value. Map your critical systems and place honeypots in adjacent network segments where an attacker conducting lateral movement would naturally encounter them.

But detection value depends entirely on realism, so design your decoy environment to mirror the characteristics of your production infrastructure. Honeypots should run services and present banners consistent with your actual technology stack. A decoy that looks transparently fake, such as an out-of-date operating system in an otherwise modern environment, won’t attract sophisticated adversaries and produces no useful intelligence.

The most critical requirement is strict network isolation between decoy components and production systems. Use dedicated VLANs, firewall rules, and network segmentation to ensure that any malicious code introduced through decoy interaction can’t reach operational assets. The UpGuard Breach Risk platform can help you monitor your external attack surface to verify that decoy infrastructure doesn’t inadvertently expose production assets.

Maintaining visibility over your full attack surface is critical when introducing decoy infrastructure, because misconfigured honeypots can inadvertently widen your exposure.

In parallel, configure comprehensive logging and alerting for all decoy interactions. Because decoys serve no legitimate business function, every connection attempt, authentication request, and data access event is anomalous and should trigger an alert. Feed these alerts into your security information and event management (SIEM) system for correlation with other detection sources.

Finally, document your decoy deployment architecture, including placement rationale, isolation controls, monitoring procedures, and incident response workflows specific to decoy-triggered alerts. Consult your legal counsel before deployment to address any data collection, privacy, or entrapment concerns.

Common mistakes to avoid:

• Deploying honeypots without adequate isolation, creating a pivot point for attackers into production networks
• Using generic, default honeypot configurations that sophisticated adversaries recognize and avoid
• Failing to monitor decoy alerts, negating the entire detection value
• Neglecting to update decoy configurations as the production environment evolves

For your vendors

When assessing whether vendors have implemented deception-based detection capabilities, focus on their architecture decisions and operational maturity rather than checking a box.

Key questionnaire questions:

• Do you deploy any deception-based detection components (honeypots, honeynets, or deception nets) within your network?
• How are decoy components isolated from production systems?
• What monitoring and alerting processes are in place for decoy interactions?
• Have you consulted legal counsel regarding your deception technology deployment?

Evidence to request:

• Network architecture diagrams showing decoy placement and isolation controls
• Monitoring and alerting configurations for decoy components
• Incident response procedures specific to decoy-triggered alerts
• Legal review documentation for deception technology deployment

Red flags during assessment:

• Vendor claims to use honeypots but can’t describe isolation architecture
• No documented monitoring or alerting workflow for decoy interactions
• Decoy infrastructure shares network segments with production systems
• No legal review conducted before deployment

The UpGuard Vendor Risk platform can streamline the assessment process by centralizing vendor questionnaire responses and tracking evidence collection for controls like SC-26 across your vendor ecosystem.

Verification approach:

Review the vendor’s network architecture documentation for evidence of decoy deployment and isolation. Request sample alert logs from decoy interactions to confirm active monitoring. Verify that incident response procedures include specific workflows for deception-triggered events.

Evidence examples

Cross-framework mapping

No cross-framework mappings are currently documented for SC-26.

Related controls

• RA-05 — Vulnerability Monitoring and Scanning: vulnerability scanning identifies weaknesses that decoy components can be positioned to protect, and scanning results inform decoy placement strategy
• SC-07 — Boundary Protection: boundary controls provide the network segmentation foundation that isolates decoy components from production systems
• SC-30 — Concealment and Misdirection: SC-30 extends the deception strategy beyond static decoys to include dynamic concealment and misdirection techniques across the environment
• SC-35 — External Malicious Code Identification: decoys can serve as collection points for malicious code samples, supporting the identification and analysis objectives of SC-35
• SC-44 — Detonation Chambers: detonation chambers provide controlled environments for analyzing malicious code captured by decoy components
• SI-03 — Malicious Code Protection: decoy-captured malware feeds into malicious code protection mechanisms, improving detection signatures and behavioral analysis
• SI-04 — System Monitoring: decoy alerts integrate with broader system monitoring to provide a comprehensive detection picture that includes deception-based indicators

Frequently asked questions

What is NIST SP 800-53 SC-26

SC-26 is the NIST SP 800-53 control that requires organizations to deploy decoy components, such as honeypots, honeynets, and deception nets, within their systems to detect, deflect, and analyze adversary activity. These decoy components serve no legitimate business function and are designed to attract malicious actors away from production assets. Any interaction with a decoy is treated as a high-fidelity indicator of compromise because authorized users have no reason to access these resources.

What happens if SC-26 is not implemented

Without decoy components, your organization loses a detection layer that catches adversary activity traditional monitoring often misses, particularly during lateral movement and internal reconnaissance phases. Auditors assessing environments with elevated threat profiles may flag the absence of deception-based detection as a gap in your defense-in-depth strategy. Failing to document a rationale for excluding SC-26, even when it’s not required by your selected baseline, can raise questions about the thoroughness of your risk assessment process.

How do you audit SC-26

Auditing SC-26 starts with verifying that honeypots, honeynets, or deception nets are deployed in network locations where they can attract and detect adversary activity. Review system design documentation and network architecture diagrams to confirm decoy placement and isolation from production systems. Examine SIEM alert configurations and sample interaction logs to validate that decoy-triggered events are monitored, analyzed, and fed into incident response workflows.

What is the difference between a honeypot and a honeynet

A honeypot is a single decoy system designed to mimic a specific resource, such as a server, database, or application, to attract and monitor attacker interactions. A honeynet extends this concept to an entire network of interconnected honeypots that simulate a realistic environment with multiple services, hosts, and network segments. Honeynets provide deeper intelligence about attacker behavior and lateral movement patterns than individual honeypots because adversaries interact with the environment as they would a real network.