In today’s fast-paced cyber environment, relying solely on traditional cybersecurity measures is no longer enough. Modern threat actors constantly evolve, using advanced tactics, techniques, and procedures (TTPs) to breach systems and evade detection. As a result, organisations must adopt a more proactive, offensive approach to security that emulates real-world attack scenarios and thoroughly tests defences. This is where Red Teaming comes into play.
Red Teaming goes beyond traditional penetration testing by simulating an adversary’s full range of attack vectors, including technical, physical, and social engineering tactics. This article will explore running a successful red team engagement from planning to execution, drawing on real-world examples and lessons learned from the front lines.
PLANNING A RED TEAM ENGAGEMENT: THE STRATEGIC FOUNDATION
A successful red team engagement begins long before the first simulated attack. It requires careful planning, scoping, and stakeholder collaboration to ensure that the exercise accurately reflects the organisation’s real-world risk environment.
Define Objectives and Scope
Establishing clear objectives and scope is crucial before engaging in any red teaming activities. This means understanding what you’re trying to achieve and which areas of your organisation’s defences you want to test.
Common objectives include:
- Testing Incident Response Capabilities: Assessing how well the organisation detects and responds to a sophisticated, multi-vector attack.
- Evaluating Security Controls: This involves determining the effectiveness of technical defences such as firewalls, intrusion detection systems (IDS), and endpoint security solutions.
- Identifying Weak Points: Uncovering vulnerabilities in the organisation’s infrastructure, processes, or personnel that adversaries could exploit.
Gather Intelligence (Reconnaissance)
One of the first steps in any red team engagement is the intelligence-gathering phase. This involves collecting information about the target environment, systems, and personnel, much like an attacker would. The red team can develop a detailed understanding of the organisation’s infrastructure and identify potential entry points by performing reconnaissance. Tools such as OSINT (Open-Source Intelligence), social media mining, and network scanning can help gather critical data.
In one engagement for a financial services company, our red team used OSINT to discover an employee’s LinkedIn post about a recent software upgrade. This information enabled us to identify the version and vulnerabilities in the software, which we later exploited to gain access to the internal network.
Set Rules of Engagement (ROE)
The Rules of Engagement (ROE) ensure that the red team operates within predefined boundaries. It is essential to outline what is off-limits (e.g., production environments) and what actions the red team can take (e.g., social engineering, phishing). This agreement helps prevent unintended damage to systems or disruption of business operations.
EXECUTION: THE ART OF SIMULATED ATTACKS
With the planning phase complete, it’s time to execute the red team engagement. This is where offensive security tactics are deployed, controlled, and systematically tested to test the organisation’s resilience.
Initial Access: Breaking Through Defences
During the initial access phase, the red team aims to breach the organisation’s defences using various techniques, including exploiting technical vulnerabilities, conducting phishing attacks, or leveraging compromised credentials. The goal is to gain a foothold in the target network, often with the help of zero-day vulnerabilities or password-spraying techniques.
In a recent engagement, our red team used a phishing campaign that mimicked an internal IT department email requesting employees to reset passwords. This campaign resulted in a 35% click rate, providing the red team access to several user accounts. Once inside, lateral movement techniques were used to escalate privileges.
Privilege Escalation and Lateral Movement
Once inside the network, the red team will attempt to escalate privileges by exploiting misconfigurations, unpatched vulnerabilities, or weak credentials. Lateral movement refers to moving from one compromised system to another, expanding access to more critical assets.
One key challenge in this phase is evading detection by the organisation’s security team. Advanced techniques such as living off the land (using native system tools to avoid detection) and credential harvesting can help the red team move silently through the network.
Real World Example
After gaining initial access, our team exploited a misconfigured Active Directory setting in one engagement, allowing us to escalate to domain admin privileges without triggering any alarms. This highlights the importance of securing administrative accounts and monitoring privileged access activities.
Persistence and Exfiltration
Persistence refers to the red team’s ability to maintain access to the compromised environment over an extended period, even if parts of their infrastructure are discovered. Techniques such as implanting backdoors, modifying registry keys, or creating rogue user accounts allow the red team to return to the environment at will.
Once persistence is established, the team’s final objective is often data exfiltration—extracting sensitive information such as intellectual property, financial records, or customer data. During this phase, the red team simulates how attackers might steal valuable data and evade data loss prevention (DLP) systems.
In a healthcare organisation engagement, our red team used PowerShell scripts to maintain persistence and exfiltrated patient data over several days by disguising the data as legitimate encrypted traffic, evading detection from security monitoring tools.
POST-ENGAGEMENT: REPORTING AND REMEDIATION
After the red team engagement, the final phase involves compiling and presenting the findings to the organisation’s security leadership. A successful red team exercise exposes weaknesses and provides actionable insights that can strengthen the organisation’s defences.
Comprehensive Reporting
The red team’s report should detail every step of the engagement, from the reconnaissance phase to the exploitation and exfiltration.
This includes:
- Findings: A comprehensive list of vulnerabilities discovered and exploited, including those related to technology, processes, and personnel.
- Attack Paths: Diagrams and descriptions of the attack chains that penetrate the network and escalate privileges.
- Recommendations: The organisation can take specific remediation steps to close security gaps, improve incident detection, and enhance response capabilities.
Debriefing and Collaboration
Conducting a post-engagement debriefing session with the blue team (defenders) and other stakeholders is essential. This session helps bridge the gap between offence and defence, fostering collaboration and learning. During the debrief, red and blue teams can share insights into attack strategies, defence mechanisms, and areas for improvement.
Real-world lesson:
In one engagement with a global manufacturing company, the red and blue teams collaborated post-engagement to create a Purple Team exercise, where both teams worked together to improve detection and response capabilities. This collaboration led to the identification of multiple blind spots in the organisation’s monitoring system and the implementation of advanced detection rules.
Continuous Improvement
Red teaming should not be viewed as a one-time event but as part of a continuous improvement cycle. By regularly conducting red team exercises, organisations can keep up with the evolving threat landscape and ensure their defences remain robust.
Key Takeaways for a Successful Red Team Engagement
- Plan Thoroughly: Define clear objectives, scope, and rules of engagement to align the red team’s activities with your organisation’s goals.
- Simulate Real-World Threats: Use realistic attack vectors that emulate the tactics of advanced adversaries, including phishing, privilege escalation, and data exfiltration.
- Collaborate Post-Engagement: Work closely with your blue team and other stakeholders to foster learning and improve your defence strategies.
- Act on Findings: Prioritise remediation efforts based on the red team’s findings and consider regular red team engagements to stay ahead of evolving threats.
Red teaming is not just a test of technical defences but an exercise in organisational resilience. By embracing offensive security tactics, organisations can identify and address critical vulnerabilities before adversaries exploit them. Through meticulous planning, skilled execution, and thorough post-engagement debriefing, red team engagements offer invaluable insights into an organisation’s true defence posture.
Running a successful red team engagement takes expertise, precision, and collaboration—but when done right, it can be a game-changer in enhancing an organisation’s cybersecurity defences.
