Full Report
There is a certain kind of conversation that doesn’t get written up in a post-mortem, doesn’t generate a ticket, and never makes it into an end-of-quarter report. It happens on the margins—at a conference, in a hallway, or, in this case, at 30,000 feet above sea level. It’s the conversation where two people who are solving the same problem from opposite ends of the table finally sit down next to each other. The post Same Problem, Different Angles: When Red Team and Blue Team Actually Talk to Each Other appeared first on Black Hills Information Security, Inc..
Analysis Summary
# Best Practices: Purple Teaming and Cross-Functional Collaboration
## Overview
These practices address the traditional "silo" effect between offensive (Red Team) and defensive (Blue Team) security operations. By bridging the gap between those who simulate attacks and those who monitor for them, organizations can accelerate detection engineering, improve response times, and shift from a competitive "us vs. them" mentality to a collaborative security posture.
## Key Recommendations
### Immediate Actions
1. **Initiate Informal "Shop Talk":** Break down social barriers by encouraging senior members of offensive and defensive teams to meet informally (e.g., coffee or "hallway tracks") to discuss current projects.
2. **Open Detection Requests:** Establish a simple process where SOC analysts can request demonstrations of specific red team techniques to verify if current logging/alerting catches them.
3. **Share "Pre-Submission" Research:** Red teams should share new techniques or bypasses they have discovered (or submitted to vendors like Microsoft) with the Blue Team before the information is public.
### Short-term Improvements (1-3 months)
1. **Implement Collaborative Detection Engineering:** When a red teamer develops a new exploit or technique, have a blue teamer sit in to write a corresponding detection rule in real-time.
2. **Cross-Team Tool Access:** Grant SOC analysts "read-only" or observer access to offensive tools or lab environments to understand the telemetry generated by attack frameworks.
3. **Joint Debriefs:** Move beyond static PDF reports. Hold live "replays" of recent penetration tests where the red team explains *how* they moved, and the blue team explains what they saw (or missed) in the SIEM.
### Long-term Strategy (3+ months)
1. **Formalize Purple Teaming:** Institutionalize regular Purple Team exercises where offense and defense work together in a transparent, "open-book" environment to test specific controls.
2. **Cultural Integration:** Build a hiring and performance model that rewards "cross-functional curiosity." Make collaboration a professional value rather than an optional distraction.
3. **Shared Threat Intelligence Pipeline:** Create a unified internal feed where offensive findings immediately inform defensive signatures, ensuring "the adversary is outside the building—not across the table."
## Implementation Guidance
### For Small Organizations
- Focus on transparency. Since teams are small, ensure the person handling security "hats" has time to switch between offensive research and defensive tuning without the pressure of rigid silos.
### For Medium Organizations
- Intentionally create "spaces between." Schedule monthly cross-training sessions where one team teaches the other a specific technical skill (e.g., "Intro to Cloud Pentesting" for SOC analysts).
### For Large Enterprises
- Fight the "process erosion" that comes with scale. Embed "Detection Liaisons" within the Red Team to ensure offensive innovation is constantly translated into defensive capabilities across global SOCs.
## Configuration Examples
While the article focuses on cultural shift, the technical workflow described is:
1. **Red Team:** Identifies a cloud-based bypass or new technique.
2. **Blue Team:** Identifies the log source (e.g., Sysmon, CloudTrail, or O365 Unified Audit Logs).
3. **Joint Action:**
- Execution of the technique in a sandbox.
- Identification of unique "indicators of behavior."
- Deployment of a specific detection logic (e.g., Sigma rule or KQL query) to the production SIEM.
## Compliance Alignment
- **NIST CSF (Identify/Protect/Detect):** Facilitates the continuous improvement of detection categories via red-team feedback.
- **MITRE ATT&CK Framework:** Provides the common language for both teams to map techniques and bridge the communication gap.
- **CIS Controls (Control 18):** Directly supports "Penetration Testing and Red Team Exercises" by ensuring results are used to improve defenses.
## Common Pitfalls to Avoid
- **Adversarial Gatekeeping:** Red teams "hiding" their best tricks to ensure they "win" the next engagement.
- **Defensive Defensiveness:** Blue teams becoming embarrassed or protective when a vulnerability is found, rather than using it as a learning opportunity.
- **The "PDF Trap":** Treating a security report as a finished product rather than the beginning of a collaborative conversation.
## Resources
- **MITRE ATT&CK:** [https://attack.mitre.org] - Framework for common language.
- **Sigma HQ:** [https://github.com/SigmaHQ/sigma] - Generic signature format for collaborative detection engineering.
- **BHIS PROMPT# Zine:** [https://www.blackhillsinfosec.com/prompt-zine/] - Community resources for cross-functional security training.