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Most enterprises already know where their vulnerabilities are. Scanners list them, penetration tests confirm them, and remediation tickets track them. What far fewer organizations know is how their defenses would hold up against a specific, capable attacker who is patient, quiet, and working toward a clear objective.
Adversary emulation answers that question. Instead of hunting for as many weaknesses as possible, an emulation engagement reproduces the tactics, techniques, and procedures of a real threat group that is likely to target the organization, and then measures how far that attacker gets before someone notices. The output is less a list of flaws and more an honest picture of whether people, processes, and technology work together under pressure.
Red Teaming, Adversary Emulation, and Penetration Testing Are Not the Same
The terms are often used interchangeably in sales conversations, but they describe different exercises with different goals.
- Penetration testing looks for as many exploitable weaknesses as possible within a defined scope, such as an application, network segment, or cloud environment. Testers are usually not trying to avoid detection, and the result is a prioritized list of vulnerabilities.
- Red teaming pursues a specific objective, such as reaching a payment system or exfiltrating sensitive data, using whatever path works across technology, people, and physical access. Stealth matters, because the exercise also tests whether defenders notice.
- Adversary emulation is a form of red teaming in which the attack path is modeled on a known threat actor. The team reproduces that group’s documented behaviors, often mapped to MITRE ATT&CK, so the organization learns how it would fare against the attackers most likely to target it.
- Many enterprises need all three at different times. When the question is whether the security program can withstand a realistic, targeted attack, emulation is the most direct way to find out.
8 Top Red Teaming Service Providers for Enterprise Adversary Emulation
1. DeepSeas
Most red team providers finish an engagement and hand over a report. DeepSeas is built to carry what the red team learns into the defense itself. As a cyber defense company that also runs managed detection and response and virtual CISO programs, it treats offensive testing as one part of an adversary-led approach to security, so the techniques its operators use can inform how detection and response are tuned afterward.
Its offensive security services cover an organization’s full attack surface: internal networks, external perimeters, web applications, cloud environments, and human factors. DeepSeas follows an “Inside Out, Outside In” assessment protocol, testing both from the perspective of an external attacker trying to break in and from that of an adversary who already has a foothold.
Its engagements range from penetration testing and vulnerability assessments to full adversary emulation, including scenarios modeled on advanced persistent threats and nation-state actors.
The human and physical layers are covered in depth. Through its DeepSeas RED social engineering services, operators test people, processes, and procedures using email phishing, telephone vishing, SMS smishing, and on-site physical attempts to gain access. For enterprises, that breadth matters, because real adversaries rarely limit themselves to one vector, and an exercise that tests only the network misses the paths attackers often find easiest.
DeepSeas’ offensive work is backed by experienced CISOs through its advisory practice, which helps translate findings into business decisions, budget priorities, and board-level reporting rather than leaving them as a technical backlog.
Emulation depth: full-spectrum engagements across digital, social, and physical vectors, including APT and nation-state scenarios.
What you walk away with: findings connected to detection, response, and security program priorities, not just a vulnerability list.
- Adversary emulation modeled on APT and nation-state tactics
- “Inside Out, Outside In” assessment protocol
- Coverage of networks, perimeters, applications, cloud, and people
- Social engineering through phishing, vishing, smishing, and physical attempts
- Offensive findings connected to MDR detection and response
- CISO-level advisory to prioritize remediation and brief leadership
2. Mandiant (Google Cloud)
Mandiant, now part of Google Cloud, brings one of the industry’s deepest incident response practices to red teaming. Its red team assessments draw on what its responders see in real breaches, which helps ground scenarios in the tactics threat actors are using right now.
Engagements are objective-based and designed to test prevention, detection, and response together. For enterprises that want scenarios informed by frontline breach investigations and large-scale threat intelligence, that connection is Mandiant’s main differentiator.
Emulation depth: objective-based red teaming informed by incident response and threat intelligence.
What you walk away with: findings framed around how real attackers operate in breaches Mandiant has investigated.
- Scenarios grounded in frontline incident response
- Threat intelligence on active threat groups
- Objective-based assessments of prevention, detection, and response
3. CrowdStrike
CrowdStrike offers adversary emulation exercises built on its threat intelligence, which tracks a large number of named adversary groups across nation-state, eCrime, and hacktivist categories. That intelligence lets engagements reproduce the specific behaviors of actors known to target a client’s industry.
Its services also include red team and blue team exercises, in which defenders are tested and coached in parallel. For organizations running CrowdStrike’s platform, results can be tied closely to the telemetry defenders already use.
Emulation depth: intelligence-led emulation of named adversary groups.
What you walk away with: insight into defenses against specific threat actors, plus defender coaching in blue team exercises.
- Emulation of named adversary groups
- Red team and blue team exercises
- Close alignment with CrowdStrike platform telemetry
4. IBM X-Force Red
IBM X-Force Red is IBM’s offensive security team, offering adversary simulation alongside penetration testing and vulnerability management services. It benefits from the broader IBM X-Force threat intelligence and incident response organization.
For large enterprises, X-Force Red’s global reach and the ability to combine red teaming with other IBM security services can simplify vendor management, especially in complex, multinational environments.
Emulation depth: adversary simulation supported by IBM X-Force threat intelligence.
What you walk away with: findings that can feed into a wider IBM security services relationship.
- Adversary simulation and red team engagements
- Backed by IBM X-Force intelligence and response
- Global delivery for multinational organizations
5. SpecterOps
SpecterOps is closely associated with identity-based attack paths. Its team created BloodHound, the widely used tool for mapping Active Directory and Entra ID attack paths, and its adversary simulation engagements reflect that depth in how attackers abuse identity to move toward critical systems.
Because so many enterprise breaches now run through identity, SpecterOps is a strong option for organizations that want to understand how an attacker could chain permissions, group memberships, and trust relationships into domain-level control.
Emulation depth: adversary simulation with particular strength in identity and directory attack paths.
What you walk away with: a clear view of identity attack paths and how to reduce them.
- Creators of BloodHound
- Deep expertise in Active Directory and Entra ID attacks
- Adversary simulation and training
6. TrustedSec
TrustedSec, founded by David Kennedy, is known for red teaming that blends technical attacks with social engineering and physical security testing. Kennedy created the Social-Engineer Toolkit, and the firm’s engagements reflect that experience in manipulating the human side of security.
For enterprises that want a single provider to test phishing resistance, physical access controls, and technical defenses as part of one objective-driven exercise, TrustedSec offers a well-established option.
Emulation depth: red teaming across technical, social, and physical vectors.
What you walk away with: a combined view of human, physical, and technical weaknesses.
- Social engineering and physical intrusion testing
- Objective-based red team engagements
- Long-standing offensive security research
7. Bishop Fox
Bishop Fox is an offensive security firm offering red teaming alongside application, cloud, and product security testing. It also runs Cosmos, a continuous attack surface management service that combines automation with human testers.
That combination suits enterprises that want point-in-time red team engagements plus ongoing testing of their external exposure between exercises.
Emulation depth: red team engagements complemented by continuous external testing.
What you walk away with: exercise findings plus ongoing visibility into exposed attack surface.
- Red team and adversary simulation
- Continuous attack surface testing through Cosmos
- Application and cloud security expertise
8. NCC Group
NCC Group is a global cybersecurity consultancy with a large offensive testing practice. It delivers red team engagements for enterprises and supports threat-led testing under regulator-driven frameworks used in financial services, such as CBEST in the United Kingdom and TIBER-EU in Europe.
For regulated organizations operating across several jurisdictions, experience with these frameworks can simplify planning and help satisfy supervisory expectations.
Emulation depth: threat-led red teaming, including regulator-driven frameworks.
What you walk away with: results structured for regulatory and supervisory reporting where required.
- Global offensive testing practice
- Support for CBEST and TIBER-EU style testing
- Red team engagements across industries
Anatomy of an Adversary Emulation Engagement
Engagements vary by provider, but most mature programs follow a similar sequence:
- Threat profile selection: the provider and client identify which threat actors are most relevant based on industry, geography, and critical assets, and document their known behaviors.
- Rules of engagement: objectives, boundaries, legal authorization, and a small “white cell” of stakeholders who know the exercise is running are agreed in advance.
- Initial access: the team gains a foothold the way the emulated actor would, through phishing, exposed services, stolen credentials, or physical entry.
- Persistence and movement: operators establish persistence, escalate privileges, and move laterally, often through identity systems, while trying to stay below detection thresholds.
- Objective pursuit: the team works toward the agreed goal, such as accessing a crown-jewel system or staging data for exfiltration.
- Debrief and detection mapping: findings are replayed with defenders, each technique is mapped to whether it was detected, and gaps are turned into detection and response improvements.
The last step is where much of the value lies. An engagement that ends with a report but no joint review with the security operations team leaves most of its lessons unused.
Choosing Which Adversary to Emulate
The value of an emulation engagement depends heavily on picking the right adversary. A realistic scenario starts with three questions:
- Who targets organizations like yours? Sector and geography narrow the field. A bank, a hospital, and a manufacturer face overlapping but different threat groups.
- What would they want? Payment systems, patient records, intellectual property, and operational technology each attract different actors with different techniques.
- How do they usually get in? Some groups rely on phishing, others on exposed edge devices, stolen credentials, or trusted third parties. The emulation should start where the real actor would.
Providers with strong threat intelligence can answer these questions with evidence rather than assumptions, and document the chosen actor’s behaviors so that every step of the engagement can be traced back to real-world activity.
Measuring Whether the Exercise Was Worth It
An adversary emulation engagement should leave behind measurable improvements, not just a report. Useful measures include:
- Time to detect: how long the emulated attacker operated before any alert fired or anyone noticed.
- Detection coverage: the share of emulated techniques that produced alerts, mapped against MITRE ATT&CK.
- Time to contain: how quickly defenders isolated compromised systems once activity was noticed.
- Escalation quality: whether the right people were informed at the right time, including leadership and legal teams.
- Remediation follow-through: how many detection gaps were closed before the next exercise.
Tracking these figures across successive engagements shows whether the security program is getting harder to breach, which is ultimately what an adversary emulation program is meant to prove.
FAQ
What is adversary emulation in red teaming?
Adversary emulation is a red team approach that reproduces the tactics, techniques, and procedures of a specific, known threat actor. Instead of testing every possible weakness, the team follows the path that the actor would likely take, allowing the organization to measure how well its defenses would hold up against the attackers most relevant to it.
How is adversary emulation different from penetration testing?
Penetration testing aims to find as many exploitable vulnerabilities as possible within a defined scope, usually without trying to avoid detection. Adversary emulation pursues a specific objective while imitating a real attacker’s behavior and stealth, testing detection and response as much as prevention. The two complement each other rather than replace one another.
How long does an enterprise adversary emulation engagement take?
Most enterprise engagements run from several weeks to a few months, depending on objectives, scope, and how much stealth is required. Planning, threat profiling, and rules of engagement add time before testing begins, and a thorough debrief with defenders follows the operational phase.
Should red team findings feed into managed detection and response?
Yes. The most valuable findings are the techniques defenders missed, and those should become new detections, improved playbooks, and better escalation procedures. Providers such as DeepSeas, which run offensive security and MDR together, can connect those lessons directly to how threats are detected and handled afterward.
Does adversary emulation include social engineering and physical testing?
It can, and for many threat actors it should. Real attackers often start with phishing, phone-based pretexting, or physical access. DeepSeas, for example, includes phishing, vishing, smishing, and on-site physical attempts in its offensive work, so the exercise reflects the full range of paths an adversary might take.
How often should enterprises run adversary emulation exercises?
Many enterprises run a full engagement annually, supplemented by smaller, focused exercises or purple team sessions between them. Organizations facing rapidly changing threats, major infrastructure changes, or regulatory testing requirements may run them more often. The key is to measure improvement from one exercise to the next.
(Photo by Niko Nieminen on Unsplash)
