Full Report
Adversary simulation ('red teaming') tests your ability to prevent, detect and respond to cyber attacks.
Analysis Summary
# Best Practices: Adversary Simulation (Red Teaming)
## Overview
Adversary simulation, or "red teaming," is a sophisticated security testing methodology designed to replicate the tactics, techniques, and procedures (TTPs) of real-world attackers. Unlike standard penetration testing, which seeks to identify as many technical vulnerabilities as possible, adversary simulation evaluates an organization’s holistic ability to **prevent, detect, and respond** to a targeted attack.
## Key Recommendations
### Immediate Actions
1. **Assess Maturity Level:** Verify that your organization has established network monitoring, detection systems, and a mature understanding of its cyber risks before commissioning a simulation.
2. **Define Critical Assets:** Identify "Crown Jewels" or business-critical functions that, if compromised, would cause significant operational impact.
3. **Engage Assured Providers:** If located in the UK or operating in critical sectors, prioritize providers assured under the NCSC’s **Cyber Adversary Simulation (CyAS)** scheme to ensure technical rigor and safety.
### Short-term Improvements (1-3 months)
1. **Select Methodology:** Determine if a **"Full Spectrum"** approach (testing all entry points) or an **"Assumed Breach"** approach (starting from inside the network to test internal lateral movement) is more appropriate for your current goals.
2. **Establish Safety Guardrails:** Define "stop-work" triggers and safety features to ensure the simulation does not accidentally disrupt live production systems or affect uninvolved third parties.
3. **Phase 1 Execution (Prerequisites):** Complete threat modeling and scoping to align the simulation with realistic attack scenarios specific to your industry.
### Long-term Strategy (3+ months)
1. **Iterative Testing (Phase 2 & 3):** Conduct the simulation and move into the reporting phase, focusing on how well the SOC (Security Operations Center) detected and triaged the activity.
2. **Remediation & Reskilling:** Use the reporting findings to update incident response playbooks and improve the configuration of detection tools (SIEM/EDR).
3. **Shift to Resilience:** Move beyond simple defense to "Cyber Resilience," ensuring the organization can maintain operations even during a successful breach.
## Implementation Guidance
### For Small Organizations
- Adversary simulation is often **not recommended** for small organizations with low security maturity.
- **Action:** Focus on **Cyber Essentials** and standard penetration testing to secure basic infrastructure first.
### For Medium Organizations
- Suitable if the organization has an internal or outsourced SOC and well-defined security policies.
- **Action:** Use adversary simulation to test the communication flow between the internal team and the third-party monitoring provider.
### For Large Enterprises / CNI
- Highly recommended, especially for Government and Critical National Infrastructure (CNI).
- **Action:** Conduct regular simulations to validate complex, multi-layered defenses and the effectiveness of high-level incident management and leadership decision-making during a crisis.
## Configuration Examples
While the article focuses on methodology, technical application includes:
- **Detection Logic:** Configure SIEM alerts to trigger on TTPs identified in the simulation (e.g., unusual PowerShell execution or lateral movement via SMB).
- **Tool Guardrails:** Ensure red team tools have built-in "kill switches" or time-limited access tokens to prevent persistent unauthorized access after the engagement ends.
## Compliance Alignment
- **NCSC CyAS Scheme:** Rigorous technical standards for simulation providers.
- **CHECK:** NCSC methodology for penetration testing in government and public sectors.
- **Cyber Assessment Framework (CAF):** Broad organizational security assessment.
## Common Pitfalls to Avoid
- **Testing Prematurely:** Running a red team exercise before having basic detection capabilities in place (leads to a "100% success" for the red team without providing learning value).
- **Treating it as a "Pass/Fail" Test:** The goal is to identify gaps and improve, not to simply "defeat" the security team.
- **Lack of Safety Controls:** Failing to define the scope strictly can lead to unintended downtime of critical business services.
## Resources
- **NCSC CyAS Scheme:** hxxps[:]//www[.]ncsc[.]gov[.]uk/schemes/cyber-adversary-simulation-cyas/introduction
- **CHECK Penetration Testing:** hxxps[:]//www[.]ncsc[.]gov[.]uk/schemes/check/introduction
- **Cyber Assessment Framework (CAF):** hxxps[:]//www[.]ncsc[.]gov[.]uk/section/advice-guidance/all-topics/cyber-assessment-framework
- **MITRE ATT&CK Framework:** (Standard industry reference for adversary TTPs)