Full Report
The merits of deploying offensive testing to strengthen an organization’s security posture are well-understood by today’s security leadership. Much to the relief of defenders, obtaining approval for an offensive security exercise has never been easier. However, the process of selecting the most appropriate offensive testing solution requires untangling overlapping definitions and vaguely defined terminology that leaves security teams more confused than when they started. How is an Adversary Emulation different from a Red Team? What about this new Breach and Attack Simulation (BAS) tool that has been receiving great publicity recently? Would it be simpler to just invest in a Penetration Test instead? To help break all this down, we will provide a framework to understand the value proposition of different offensive security services from a defender’s perspective, focusing on the core assumptions underlying each solution’s methodology. We will also identify important factors that help with narrowing down which form of offensive testing is best suited for your organization. The Ends and The Means To understand the differences between types of offensive testing, consider the following: Are defenses being tested against attacks in general, or specific adversaries? Are offensive techniques being emulated for maximum realism, or simulated for rapid validation? This framework allows us to classify offensive security services into four general categories. Attack Adversary Simulation Breach and Attack Simulation (BAS) TTP-Agnostic Red Teaming Emulation Penetration Testing TTP-Driven Red Teaming Although there is often methodological overlap between the four quadrants, this model can be used to make sense of industry terminology from a defender’s point of view by focusing on the how and the why of conducting offensive security testing. To use a domestic analogy, let’s assume you want to ensure your home is safe from being broken into. The type of test you choose will dictate what you learn about your security posture. Breach and Attack Simulation (BAS) focuses on the repeatable execution of individual attacks, usually in an automated fashion, targeting specific defensive capabilities, much like trying the door handle every few hours to make sure the lock is engaged. Crucially, the focus is on ensuring that the lock’s status is validated, and not on the specific mechanics of how the handle was engaged. Penetration Testing, on the other hand, is a time-bound, scoped assessment targeting a specific goal, usually with the full awareness of the internal security team. This is like hiring a professional burglar to attempt breaking in within a set duration, but with certain limits - lock picking is okay, but smashing the window is out of bounds! Red Teaming, whether TTP-driven or not, is a comprehensive exercise that targets an organization similar to how a real-life adversary would, often with no warning provided to defenders. Continuing our analogy, this is similar to tasking professionals with breaking into your house from start to finish, like a real burglar, with few restrictions. In this situation, you may want to smash the window to see if the home security service you paid for is worth the money. The Right Tool for the Job When selecting an offensive security service, organizations should first ensure that foundational defensive controls are in place. Engaging a Red Team without having validated basic controls will surface findings that would likely also have been discovered with Penetration Testing. First, leverage BAS to identify gaps and misconfigurations and validate the functionality of security tools. Subsequently, conducting Penetration Tests on internal networks and web applications can unearth additional vulnerabilities and attack paths in custom software and business logic. Finally, engaging in a Red Team will test defenders’ readiness to combat a targeted, real-world attack by a sophisticated adversary. The choice of whether a Red Team is TTP-agnostic or TTP-driven (Adversary Emulation vs Simulation) will depend on whether you are concerned about specific threat actors or groups and are interested in testing tailored defenses, such as detection rules for TTPs used to target your industry. While it is tempting to jump directly to the “most realistic” form of security testing, this misconception results in limited value being obtained from an offensive security exercise. Adversaries will take the path of least resistance into an organization - before smashing the window, a burglar will pick your lock, but before that, they will certainly just try the handle.
Analysis Summary
# Best Practices: Selecting and Implementing Offensive Security Testing
## Overview
These recommendations provide a framework for selecting the appropriate offensive security testing service based on organizational readiness and security objectives. The guidelines help differentiate between various testing methodologies (BAS, Penetration Testing, Red Teaming/Adversary Emulation) to maximize security posture improvement by aligning the 'Ends' (testing goals) with the 'Means' (methodology).
## Key Recommendations
### Immediate Actions
1. **Validate Foundational Controls:** Before investing in advanced testing (like Red Teaming), confirm that all basic, foundational defensive controls are in place and functional. (Analogy: Ensure the door handles are checked/locked before testing locks).
2. **Deploy Breach and Attack Simulation (BAS):** Immediately prioritize the implementation of BAS tools or processes to continuously and automatically validate the operational status of existing security controls against known attack techniques (TTPs).
### Short-term Improvements (1-3 months)
1. **Execute Scoped Penetration Tests:** Schedule time-bound, specifically scoped Penetration Tests targeting known high-risk areas, such as internal networks and critical web applications, to uncover vulnerabilities in custom software and business logic.
2. **Establish Testing Boundaries:** When procuring any offensive service (especially Penetration Testing), clearly define acceptable activities ("what is in bounds") and explicitly forbidden activities ("what is out of bounds") to manage organizational risk.
### Long-term Strategy (3+ months)
1. **Implement Targeted Red Teaming:** Once foundational defenses are validated (BAS) and specific application/network vulnerabilities are known (Pentests), schedule comprehensive Red Teaming exercises to test the readiness of defenders against sophisticated, real-world adversary behavior.
2. **Determine Adversary Focus (TTP-Driven vs. TTP-Agnostic):** If concerns exist about specific regional threat actors or industry-specific attacks, opt for **TTP-Driven Red Teaming (Adversary Emulation)** to test tailored detection rules. If a general but comprehensive adversarial assessment is needed, choose **TTP-Agnostic Red Teaming**.
## Implementation Guidance
The selection of the offensive testing method should follow a maturity-based approach:
| Step | Objective | Testing Service | Core Focus |
| :--- | :--- | :--- | :--- |
| **Foundation** | Validate tool efficacy and find easy gaps. | **Breach and Attack Simulation (BAS)** | Repeatable, automated validation of specific defensive capabilities. |
| **Deep Dive** | Uncover complex vulnerabilities in custom logic and paths. | **Penetration Testing** | Time-bound, scoped exploitation against specific targets (e.g., web apps). |
| **Readiness** | Test the entire defense and response team against a full scope attack. | **Red Teaming** | Comprehensive simulation of a real-world adversary with minimal warning. |
### For Small Organizations
- **Focus on BAS:** Start with BAS to quickly identify and remediate misconfigurations, ensuring high-priority security tools are actually working as intended without significant manual effort.
- **Utilize Scoped Pentests:** Conduct focused Penetration Tests on externally facing assets first, as resources are often limited for full-scope Red Team operations.
### For Medium Organizations
- **Integrate BAS and Pentesting:** Ensure BAS runs continuously, and schedule regular (e.g., annual) Penetration Tests for internal systems and applications.
- **Introduce Adversary Emulation Selectively:** If specific, relevant threat intelligence indicates a high risk from a particular threat actor group, invest in a **TTP-Driven Red Team** exercise to test detection for those specific tactics.
### For Large Enterprises
- **Tiered Approach:** Implement all three layers sequentially: continuous BAS, scheduled network/application Pentests, and intermittent, high-fidelity Red Team engagements.
- **Define Red Team Realism:** Clearly articulate whether the Red Team needs to emulate specific threat actor TTPs (Adversary Emulation) or focus solely on achieving a broad objective efficiently (TTP-Agnostic), based on the current threat landscape assessment.
## Configuration Examples
*No specific technical configuration examples were provided in the source text; however, the methodologies imply configuration requirements:*
| Testing Type | Implied Configuration Focus |
| :--- | :--- |
| **BAS** | Ensure simulation payloads are configured to reliably test controls without causing unintended service disruption (e.g., ensuring payload detection thresholds are set appropriately). |
| **Penetration Test** | Define explicit credential scope, IP range permissions, and authorization levels *before* the test begins. |
| **Red Team** | Establish clear Rules of Engagement (ROE) defining communication protocols for emergencies, but otherwise allowing the team to operate with maximum realism regarding C2 infrastructure and lateral movement paths to test defensive detection/response. |
## Compliance Alignment
This framework directly supports maturity models found in recognized security standards by providing a structured path to validating controls:
* **NIST Cybersecurity Framework (CSF):** Directly addresses the **Identify, Protect, and Respond** functions by systematically testing the effectiveness of implemented controls (BAS/Pentest) and the readiness of personnel (Red Team).
* **ISO/IEC 27001 (Annex A Controls):** Utilizing offensive testing serves as evidence that security controls mandated by the standard are functioning effectively in practice, moving beyond simple policy documentation.
## Common Pitfalls to Avoid
1. **Jumping Straight to Realism:** Avoid the misconception that the "most realistic" test (Red Teaming) provides the best initial value. Engaging a Red Team when basic controls fail leads to expensive findings that simpler, cheaper tests would have revealed.
2. **Confusing Terminology:** Do not use Penetration Testing when the true goal is to test the detection and response capabilities against a sophisticated, realistic adversary (which requires Red Teaming).
3. **Ignoring the Path of Least Resistance:** Adversaries will use the simplest available method. Testing complex scenarios before ensuring basic configuration hygiene (e.g., locked doors) will result in limited insight into true operational risk.
## Resources
This analysis relies on classifying offensive security services based on two axes: Adversary Focus (General vs. Specific) and Technique Realism (Simulation vs. Emulation).
*Note: The source text focuses on defining methodologies rather than listing specific commercial tools for validation, beyond the category names themselves.*