Full Report
Red and blue teams often operate independently, but attackers don't. Picus Security shows how continuous purple teaming and BAS turn red-blue rivalry into real defense, validating controls and closing gaps in real time. [...]
Analysis Summary
# Best Practices: Continuous Purple Teaming and Automated Validation
## Overview
These practices focus on transforming traditional, siloed red team/blue team operations into a collaborative, **continuous Purple Teaming** process. The goal is to replace episodic testing with ongoing validation of security controls in real-time, leveraging Breach and Attack Simulation (BAS) technology to rapidly close security gaps identified during attack emulation.
## Key Recommendations
### Immediate Actions
1. **Cease Silo Operations:** Immediately mandate initial meetings between Red and Blue team leads to establish collaborative goals, rather than competitive metrics (e.g., Red team success rate vs. Blue team control coverage).
2. **Map to Real Threats:** Identify the top 3 realistic, high-impact attack paths that target your organization's "crown jewels" (e.g., a full kill chain from initial access to data exfiltration). **Do not** lead testing with generic compliance checklists.
3. **Establish the Core Loop:** Define the initial, non-negotiable operational cycle: **Attack $\rightarrow$ Observe $\rightarrow$ Fix $\rightarrow$ Validate $\rightarrow$ Repeat.**
### Short-term Improvements (1-3 months)
1. **Implement Continuous Validation Tools:** Adopt Breach and Attack Simulation (BAS) technology to automate the execution of known adversary Techniques, Tactics, and Procedures (TTPs) mapped to the MITRE ATT&CK framework.
2. **Focus Observability on Silence:** For initial automated runs, instruct the Blue Team to stop focusing solely on alerts and instead prioritize reporting on **which controls stayed silent** during the attack simulation—these represent immediate remediation priorities.
3. **Tune Signature-Based Alerts:** Aggressively review security tool alerts generated by automated simulations that rely only on **signatures** rather than behavioral TTPs. Tune or suppress these "noise" alerts to allow defenders to focus on meaningful threats.
4. **Measure Effectiveness Triad:** Begin systematically scoring security controls based on their effectiveness across the triad: **Prevention, Detection, and Response.**
### Long-term Strategy (3+ months)
1. **Integrate BAS into CI/SecOps:** Establish a rhythm where new defensive configurations (e.g., EDR policy changes, firewall rule updates) trigger automated reassessment via BAS before deployment to production, ensuring new changes do not introduce regressions.
2. **Formalize Remediation Prioritization:** Use continuous simulation results to drive the remediation backlog. Prioritize fixing control failures that occur earliest in the attack chain (e.g., initial access blockers or lateral movement detection).
3. **Redefine Team Success:** Shift success metrics away from "number of incidents found" (Red) or "uptime" (Blue) towards **"Rate of Control Coverage Improvement per Attack Scenario"** and **"Time to Remediate Silent Controls."**
4. **Automate Full Kill Chain Scenarios:** Move beyond testing individual controls and begin continuously validating end-to-end attack chains (e.g., Internal Recon $\rightarrow$ Privilege Escalation $\rightarrow$ Lateral Movement $\rightarrow$ Persistence).
## Implementation Guidance
### For Small Organizations
- **Focus on Baselines:** Use BAS simplicity to establish immediate baselines for key controls like email gateway protection and EDR/antivirus blocking critical endpoint execution attempts.
- **Leverage Shared Visibility:** If dedicated Red/Blue teams are impractical, assign an engineer to "drive" the BAS tool while a SOC analyst monitors the resulting logs, acting as a rapid, informal purple team iteration loop.
### For Medium Organizations
- **Standardize TTP Mapping:** Ensure all attack simulations executed by BAS are explicitly mapped to relevant MITRE ATT&CK entries to facilitate standardized reporting and gap analysis.
- **Scope Attack Chains Strategically:** Focus resources on validating controls protecting the most sensitive asset groups based on a rapid business impact assessment.
### For Large Enterprises
- **Scale Automation:** Utilize BAS to automate the validation of thousands of configuration elements across diverse environments (cloud, on-premise, hybrid) that are too complex for manual quarterly testing.
- **Integrate Feedback Loops:** Ensure that the output from the BAS platform (e.g., control failure data) is automatically ingested into ticketing/workflow management systems to trigger remedial actions across infrastructure silo teams.
## Configuration Examples
*While specific vendor commands are not provided, the configuration focus should be on:*
1. **BAS Simulation Profiles:** Configure automated BAS scenarios that explicitly test specific lateral movement vectors like WMI and PsExec, ensuring coverage for both prevention and detection rules designed to block them.
2. **Control Validation on Fixes:** After deploying a new rule (e.g., stricter registry modification monitoring), immediately configure a re-run of the specific technique used by the adversary to validate the fix before closing the ticket, ensuring **"Attack. Observe. Fix. Validate. Repeat."** is complete.
## Compliance Alignment
The continuous, evidence-based validation inherent in this approach strongly aligns with principles found in:
* **NIST Cybersecurity Framework (CSF):** Particularly the **Identify** (Asset Management, Risk Assessment) and **Protect** (Protective Technologies) functions, heavily supported by the **Detection** and **Respond** functions through continuous measurement.
* **ISO/IEC 27001/27002:** Focuses on the need for systematic review and assessment of control effectiveness, moving beyond periodic audits to continuous assurance.
* **CIS Critical Security Controls:** Provides a structured TTP list highly suitable for immediate mapping within BAS testing suites.
## Common Pitfalls to Avoid
1. **Treating Purple Teaming as a One-Time Event:** Reducing it to a "friendlier Red Team exercise" instead of a continuous, high-rhythm workflow.
2. **Focusing on Vanity Metrics:** Measuring success purely by the sheer volume of tests run, rather than the measurable reduction in control blind spots (silent controls).
3. **Ignoring Silent Controls:** Failing to prioritize remediation for security controls that did not fire or alert during a realistic attack simulation, as these represent immediate defense gaps.
4. **Manual Bottlenecks:** Allowing the process of setting up new attack campaigns to remain manual, which negates the speed advantage of continuous validation and allows attacker TTPs to evolve beyond your testing window.
## Resources
- **Framework Reference:** MITRE ATT&CK framework (used by BAS systems to map adversary TTPs).
- **Conceptual Guidance:** SANS material referencing the convergence of offensive and defensive security operations.
- **Platform Enablement:** Breach and Attack Simulation (BAS) platforms (General category reference).