Setting Up a Red/Blue Team Exercise to Test NDR Capabilities

In today’s fast-evolving threat landscape, organizations cannot afford to rely on passive defenses or outdated testing methods. Network Detection and Response (NDR) solutions provide continuous, real-time monitoring of network traffic to detect and respond to threats. But how do you know if your NDR is truly effective? One of the most powerful ways to evaluate and enhance NDR performance is through Red/Blue team exercises.

These simulated attack-defense scenarios not only put your security tools to the test but also help improve coordination across teams and highlight gaps in visibility and response capabilities. In this blog post, we’ll walk you through how to set up a Red/Blue team exercise focused on evaluating your NDR platform.

Why Test NDR with Red/Blue Team Exercises?

Unlike traditional security assessments, Red/Blue team simulations mimic real-world attack and defense dynamics. This provides valuable insights into:

• The effectiveness of your NDR in detecting various attack stages.

• How well the SOC team responds to alerts and anomalies.

• Visibility gaps in network telemetry.

• The NDR platform’s behavioral analytics and anomaly detection performance.

• Integration effectiveness with other security tools like SIEM or SOAR.

Step 1: Define Objectives and Scope

Start by identifying the primary goals of the exercise:

• Is the goal to test the detection of lateral movement?

• Evaluate response times to command-and-control (C2) communication?

• Measure visibility into encrypted traffic?

Clearly defining scope and objectives helps avoid confusion and ensures actionable outcomes. Also, determine:

• Network segments to include (e.g., production, staging).

• Systems to exclude (e.g., critical or high-risk environments).

• Whether deception technology (e.g., honeypots or decoy credentials) will be used.

Step 2: Assemble the Red and Blue Teams

A typical setup involves:

• Red Team: Offensive experts who emulate adversaries. They should have knowledge of advanced TTPs (Tactics, Techniques, and Procedures) aligned with frameworks like MITRE ATT&CK.

• Blue Team: Defensive team (often your internal SOC or MDR provider) tasked with detection, investigation, and response.

You may also include a White Team as observers or referees to maintain rules of engagement, collect data, and ensure that the test remains controlled.

Step 3: Establish the Rules of Engagement (RoE)

Documented Rules of Engagement (RoE) are critical for setting expectations and boundaries:

• What types of attacks are permitted? (Phishing, malware deployment, privilege escalation, etc.)

• Timeframe for the exercise.

• Communication channels between teams.

• Safety protocols to avoid disruption of business-critical systems.

• Logging and reporting requirements.

Ensure that all stakeholders, including IT and legal teams, sign off on the RoE.

Step 4: Design Realistic Attack Scenarios

The Red Team should design multi-stage attacks that reflect real adversarial behavior:

• Initial Access: Spear phishing, exploiting internet-facing applications.

• Persistence: Deploying remote access tools, modifying registry keys.

• Lateral Movement: RDP hopping, pass-the-hash, SMB exploits.

• Exfiltration: Using DNS tunneling or encrypted C2 channels.

• Evasion: Obfuscating payloads, bypassing endpoint protection.

These attack chains should align with tactics that your NDR solution claims to detect.

Step 5: Monitor and Log with NDR

Now, the spotlight is on your NDR platform:

• Is it generating alerts at each attack phase?

• Can it correlate seemingly benign events into high-fidelity threat indicators?

• How does it handle encrypted traffic inspection?

• Is it leveraging behavioral baselines and anomaly detection to catch novel threats?

• Can it integrate with deception elements like decoy assets or credentials to divert attackers?

A well-tuned NDR should flag reconnaissance, lateral movement, suspicious beaconing, and data exfiltration with contextual insights and TTP mapping.

Step 6: Blue Team Response

While the Red Team launches attacks, the Blue Team should:

• Investigate NDR alerts in real-time.

• Correlate findings with logs, endpoint telemetry, or threat intelligence feeds.

• Use playbooks or automated workflows for response (e.g., isolate host, block IP).

• Deploy deception techniques like dynamic decoy creation to mislead attackers.

This is also a great time to evaluate the incident response workflow and communication efficiency between analysts and incident handlers.

Step 7: Post-Exercise Debrief and Analysis

Once the simulation concludes:

• Conduct a joint debrief involving Red, Blue, and White teams.

• Review which attack stages were detected by NDR and which were missed.

• Analyze response timelines—Mean Time to Detect (MTTD) and Mean Time to Respond (MTTR).

• Identify tuning opportunities for the NDR (e.g., better protocol parsing, improved ML baselines).

• Evaluate whether deception assets successfully engaged or delayed attackers.

This feedback loop is critical for maturing your NDR deployment and enhancing both detection rules and response protocols.

Step 8: Iterate and Improve

Security testing is not a one-off event. Use insights from the exercise to:

• Fine-tune NDR detection models and alert thresholds.

• Train analysts on new attacker techniques.

• Expand coverage across more network segments.

• Introduce purple team initiatives to blend offensive/defensive strategies.

• Schedule periodic Red/Blue team simulations as part of a proactive defense strategy.

Best Practices for Red/Blue Team NDR Testing

• Use threat emulation tools like Caldera, Atomic Red Team, or MITRE ATT&CK Evaluations.

• Include deception technologies (honeypots, decoy files, fake credentials) to test attacker behavior in controlled traps.

• Incorporate TLS decryption or metadata analysis to catch encrypted threats.

• Enable NDR logging integration with SIEM for end-to-end visibility.

• Use KPIs and metrics (e.g., detection rate, false positives, dwell time) to benchmark progress.

Conclusion

Testing your NDR platform in a Red/Blue team exercise is one of the most effective ways to validate its real-world efficacy. These simulations surface blind spots, validate detection logic, and enhance the collaboration between your threat detection and response teams. As attackers continue to evolve, so must your defenses—starting with dynamic, adversarial simulations that challenge and refine your NDR capabilities.

With a well-orchestrated Red/Blue team exercise, you not only test the technology but also the people and processes that support your organization’s cybersecurity posture.