Originally published at Cyberpath
What is Red Teaming?
Red teaming goes beyond traditional penetration testing by simulating real-world adversaries to test an organization's detection and response capabilities. Unlike pentesting, which focuses on finding vulnerabilities, red teaming evaluates the entire security program. A red team engagement assesses not just technical controls, but also people, processes, and the organization's ability to detect and respond to sophisticated attacks over an extended period.
Red Team Engagement Phases
WARNING
Legal Notice:
All techniques discussed in this article are for authorized security testing only. Unauthorized access to computer systems is illegal and punishable by law.
Phase 1: Reconnaissance
Reconnaissance is the foundation of any successful red team operation. Professional red teamers spend significant time gathering intelligence about their target before attempting any active engagement. This phase involves collecting information from publicly available sources, analyzing the target's digital footprint, and building a comprehensive understanding of the attack surface.
OSINT (Open Source Intelligence)
Open source intelligence gathering leverages publicly available information to build a profile of the target organization. Company websites often reveal technology stacks, employee names, and organizational structure. Job postings inadvertently disclose internal tools, technologies, and security practices. Social media profiles provide insights into employee relationships and potential social engineering vectors. DNS records and subdomain enumeration reveal the extent of the target's internet-facing infrastructure. Public code repositories sometimes contain sensitive information like API keys or architectural details. Data breach databases may contain previously compromised credentials that could provide initial access.
Phase 2: Initial Access
Once we've gathered intelligence, we need to gain initial access. The choice of attack vector depends on the target's security posture and the rules of engagement. Phishing campaigns remain highly effective, using crafted emails that trick users into providing credentials or executing malicious payloads. Web application exploitation targets vulnerabilities like SQL injection, cross-site scripting, or remote code execution in internet-facing services. Credential stuffing leverages leaked credentials from previous breaches to gain access to target systems. Social engineering manipulates individuals to divulge confidential information or perform actions that compromise security. Physical access attacks involve gaining unauthorized entry to facilities or direct access to devices. Supply chain compromises target third-party vendors or service providers to gain indirect access to the target organization.
Phishing: Crafted emails that trick users into providing credentials or executing malicious payloads through social manipulation.
Web Exploitation: Exploiting vulnerabilities in web applications like SQLi, XSS, or RCE to gain unauthorized access.
Credential Stuffing: Using leaked credentials from previous breaches to gain access to target systems and services.
Social Engineering: Manipulating individuals to divulge confidential information through psychological tactics.
Physical Access: Gaining unauthorized physical access to facilities or devices through tailgating or bypass techniques.
Supply Chain: Compromising third-party vendors or service providers to gain indirect access to the target.
Phase 3: Command and Control (C2)
After gaining initial access, we need to establish a command and control channel. Here's the typical C2 architecture:
C2 Evasion Techniques
Modern red team operations use sophisticated techniques to avoid detection by security monitoring systems. Domain fronting hides the true destination of traffic behind trusted CDN services, making it appear as legitimate traffic to major cloud providers. DNS tunneling exfiltrates data through DNS queries, bypassing traditional network monitoring that focuses on HTTP/HTTPS traffic. Protocol mimicry makes C2 traffic look like legitimate protocols such as HTTPS or DNS, blending in with normal network activity. Time-based execution ensures implants only communicate during business hours when network activity is highest, reducing the chance of detection through anomalous timing patterns. Jitter and randomized sleep intervals prevent security systems from identifying regular beacon patterns that indicate compromised hosts.
Phase 4: Privilege Escalation
After establishing access, we typically need elevated privileges. Common Windows privilege escalation techniques:
| Technique | Description | Difficulty |
|---|---|---|
| Token Impersonation | Steal access tokens from privileged processes | Medium |
| UAC Bypass | Circumvent User Account Control | Easy-Medium |
| Kernel Exploits | Exploit OS vulnerabilities | Hard |
| Service Misconfigurations | Abuse weak service permissions | Easy |
| DLL Hijacking | Place malicious DLL in search path | Medium |
| Scheduled Tasks | Exploit weak scheduled task permissions | Easy-Medium |
Phase 5: Lateral Movement
Once we have privileged access on one system, we move laterally across the network:
Red Team vs Blue Team
Understanding both sides makes you a better security professional. Red teams simulate real attackers to find vulnerabilities before malicious actors do, test detection and response capabilities, and challenge assumptions about security controls. They operate with an offensive mindset, constantly looking for weaknesses in technical controls, processes, and human factors. Blue teams monitor and defend systems, detect and respond to threats, implement security controls, and learn from red team findings. They maintain a defensive posture, continuously improving detection capabilities and response procedures based on both real incidents and red team exercises. The interaction between red and blue teams creates a feedback loop that strengthens overall security posture.
Essential Red Team Tools
Professional red teamers rely on a curated toolset covering every phase of an engagement. Reconnaissance tools like Nmap provide network scanning and service detection, while Masscan offers high-speed port scanning capabilities. Amass excels at subdomain enumeration, and theHarvester automates OSINT gathering from multiple sources. For initial access, Metasploit provides a comprehensive exploitation framework, and Cobalt Strike offers commercial C2 capabilities with advanced evasion features. Gophish enables realistic phishing campaign simulations, while SET (Social Engineering Toolkit) automates various social engineering attacks.
Post-exploitation tools become critical after gaining initial access. Mimikatz extracts credentials from Windows systems, BloodHound visualizes Active Directory attack paths, and PowerSploit provides PowerShell-based post-exploitation modules. Empire offers both PowerShell and Python post-exploitation capabilities with a user-friendly interface. For maintaining persistence, SharPersist provides a Windows persistence toolkit, Impacket implements network protocols for lateral movement, and Covenant offers a .NET-based C2 framework with strong operational security features.
Best Practices for Red Team Operations
Professional red team engagements require strict adherence to ethical and operational guidelines. Always obtain proper written authorization with signed agreements before beginning any testing activities. Define clear rules of engagement that specify what is in scope and out of scope, including systems, timeframes, and acceptable techniques. Maintain operational security throughout the engagement to protect client data and engagement details from disclosure. Document every action taken during the engagement with detailed logs for reporting and legal protection.
Communicate responsibly by reporting critical findings immediately rather than waiting for the final report, especially for actively exploited vulnerabilities. Clean up after yourself by removing persistence mechanisms, backdoors, and artifacts created during testing. Provide actionable remediation guidance that helps the client fix identified issues rather than just documenting problems. Remember that the goal is improving security, not just demonstrating technical skills.
Conclusion
Red team operations are complex, multifaceted engagements that require deep technical knowledge, creativity, and ethical responsibility. By simulating sophisticated adversaries, red teams help organizations understand their true security posture and improve their defensive capabilities.
Professional red teaming goes beyond finding vulnerabilities to testing an organization's entire security program, including people, processes, and technology. The insights gained from these engagements enable organizations to prioritize security investments, improve detection capabilities, and build more resilient systems. Red teaming is about improving security through adversarial simulation, helping organizations prepare for real threats they will inevitably face.
Further Reading
The MITRE ATT&CK Framework provides comprehensive documentation of adversary tactics and techniques observed in real-world attacks. Red Team Development and Operations offers practical guidance for conducting professional engagements. The Awesome Red Teaming repository curates tools, resources, and learning materials. The Red Teaming Handbook covers practical aspects of planning and executing engagements from initial scoping through final reporting.
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