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.
The terms are often used interchangeably in sales conversations, but they describe different exercises with different goals.
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.
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.
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.
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.
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.
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.
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.
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.
Engagements vary by provider, but most mature programs follow a similar sequence:
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.
The value of an emulation engagement depends heavily on picking the right adversary. A realistic scenario starts with three questions:
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.
An adversary emulation engagement should leave behind measurable improvements, not just a report. Useful measures include:
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.
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.
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.
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.
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.
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.
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.
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