Adversary Simulation Services

Generic red teams run a generic playbook. We start from the threat actors actually targeting your sector, emulate their tactics end to end, and show you exactly how far a realistic, funded adversary gets before your defences stop them.

Delivered by RedSecLabs: CREST member, PCI SSC QSA Company, ISO 27001 and 9001 certified (UKAS-accredited). Intelligence-led scenarios as a scoped deliverable, never a platform subscription, and your engagement data never leaves the engagement.

CREST Certified Pen Test Provider ISO Certified OSCP Certified Industry Certification

Get Your Fixed-Fee Quote

Tell us what needs testing. You’ll get a scoped, fixed-fee quote back the same business day, from a senior assessor, not a sales rep. No obligation, no spam.

✓ Same-day response✓ Fixed-fee, no surprises✓ Senior testers only✓ Retest included

We reply within one business day with next steps. Your details are used only to scope your enquiry, never shared or sold.

Adversary simulation, scoped to real threats

Generic red teams run a generic playbook. Adversary simulation starts from intelligence: which threat groups actually target your sector, what tactics, techniques and procedures they use, and how your specific environment would hold up against them. We build the scenario from that profile, then execute it end to end, initial access, persistence, privilege escalation, lateral movement, and objective, exactly as the modelled actor would.

Every action is mapped to MITRE ATT&CK and executed under strict rules of engagement with a standing abort line. The goal is not to “win”, it is to produce a truthful picture of how far a realistic, funded adversary gets before your people, process and technology stop them.

Emulate a named actor, or run continuously

For a point-in-time answer, we emulate a specific threat actor relevant to your sector, financial-crime groups for banks, ransomware affiliates for manufacturing and healthcare, and report how your defences performed against that profile. For teams that ship and change constantly, we run adversary simulation as a recurring programme, re-testing key attack paths each cycle so a new gap introduced by last month’s deployment does not sit open for a year.

Threat intelligence here is a deliverable, a targeting report built for your entity, not a platform you have to subscribe to. Regulated frameworks (TIBER-EU, CBEST, DORA TLPT, SAMA FEER) require exactly this intelligence-led approach, and we deliver it in a form your regulator accepts.

What you leave with

An ATT&CK-mapped attack narrative showing every step from initial access to objective, a defensive-gap analysis tied to the specific techniques that succeeded, a detection and response scorecard (what fired, what didn’t, how long it took), and a prioritised remediation roadmap. For programme clients, a trend line across cycles that proves the direction of travel to your board.

Three ways to run it

From a single named-actor test to a continuous programme.

Named-actor emulation
Emulate one threat actor relevant to your sector, end to end, point-in-time.
  • Intelligence-led scenario
  • Full kill-chain execution
  • ATT&CK-mapped report
Scope an emulation
MOST CHOSEN
Objective-based red team
A full engagement against defined objectives, with a purple-team replay to fix what it finds.
  • Objective-based scenario
  • Purple-team replay included
  • Detection backlog delivered
Scope the engagement
Continuous programme
Recurring simulation that re-tests critical attack paths each cycle.
  • Per-release or quarterly
  • Catches new gaps in weeks
  • Board-level trend line
Build the programme

How an adversary simulation runs

Intelligence first, then a controlled end-to-end emulation of a real threat actor.

1
Threat profiling
We build a targeting profile: which actors realistically threaten your sector, and the tactics they use, mapped to MITRE ATT&CK.
2
Controlled execution
Senior operators emulate that actor end to end under strict rules of engagement, with a standing abort line and same-day flags for critical exposures.
3
Debrief and harden
You get an ATT&CK-mapped attack narrative, a detection scorecard, and a prioritised roadmap, with a purple-team replay where chosen.

Frequently asked questions

A penetration test enumerates vulnerabilities in a defined scope. Adversary simulation emulates a specific real-world threat actor end to end, testing whether your people, process and detection stack stop them, not just whether a vulnerability exists. It answers “how would we fare against the groups actually targeting us?”

The intelligence is a scoped deliverable: a targeting report and scenario set built for your entity, mapped to MITRE ATT&CK. There is no platform subscription to buy, and your engagement data is never fed into a product or shared feed. Regulated frameworks treat TI exactly this way.

Intelligence-led adversary simulation is the method those frameworks mandate. For formal regulated engagements we deliver through our threat-led penetration testing practice with regulator-ready closure documentation; for everyone else, the same method without the regulatory overhead.

Both. A named-actor emulation gives a point-in-time answer; a continuous programme re-tests critical attack paths each cycle so newly introduced gaps are caught in weeks, not at next year’s audit. Fast-moving engineering teams usually prefer the programme.

Get My Fixed-Fee Quote

Book a free 30-minute scoping call. CREST-format proposal within 48 hours, engagement starts within 1-2 weeks.

Frequently Asked Questions

CREST audits member companies against a quality framework covering methodology documentation, tester competence (mandatory CREST-certified individuals), ethical conduct, ongoing professional development, complaint handling, and operational quality. Membership is reviewed periodically and can be withdrawn. It is the strongest single quality signal for penetration testing providers.

CREST Registered Tester (CRT) is the entry-level individual certification, passed after demonstrating practical infrastructure testing competence. CREST Certified Tester (CCT) is the senior level requiring substantially more experience and a harder examination, separated into Infrastructure and Applications specialisms. CCT testers lead the most complex engagements.

Methodologically, both should look similar. The differences are: tester certification (CREST member companies must use CREST-certified testers), audited quality framework (CREST audits members), ethical conduct framework (formal CREST code), and report quality expectations (CREST-format reports are recognisable to enterprise security teams). For regulated buyers, CREST removes the need to assess these things yourself.

CREST testing typically runs 10-25% above unaccredited equivalents reflecting the cost of certified-tester staffing and quality framework. External infrastructure tests £4,500-£11,000; web application tests £6,500-£20,000; threat-led testing engagements £45,000+. Fixed-fee quotes within 48 hours of scoping.

Yes. Every penetration test we deliver follows CREST methodology and is led by CREST-certified testers, there is no "CREST-lite" or non-CREST option from RedSecLabs. Other services like vulnerability assessment and red teaming follow their own appropriate methodologies (CREST also accredits red teaming under STAR).
What you receive

Every engagement includes

  • Scoping call. A 30-minute call to define scope, timeline, and authorisation boundaries.
  • Test plan. Written test plan covering targets, methodology, and rules of engagement.
  • Technical report. Detailed findings with reproduction steps, evidence, and remediation guidance.
  • Executive summary. Board-ready 1-2 page summary with risk ratings and business impact.
  • Audit-ready evidence. Findings letter formatted for auditors, customers, and supervisory authorities.
  • Retest letter. Free retest of remediated findings within an agreed window. Confirmation letter included.
  • Remediation call. A call with our lead tester to walk through findings and remediation strategy.
How we deliver

Our process, end to end

  1. 1
    Scoping call & fixed-scope quote
    A 30-minute call. We define scope, targets, timeline. You get a fixed-scope quote within one working day. No surprise invoices.
  2. 2
    Test plan & authorisation
    Written test plan covering methodology, targets, and rules of engagement. Authorisation letter signed before any testing begins.
  3. 3
    CREST-accredited execution
    Senior tester runs the engagement. Critical findings flagged immediately during testing. Daily updates if you want them.
  4. 4
    Technical + executive report
    Detailed technical findings with reproduction steps. Board-ready executive summary. Delivered within agreed working days.
  5. 5
    Remediation call & retest
    Walkthrough with our lead tester. Retest of remediated findings within the agreed window. Confirmation letter for your auditors.
Engagement scope

What shapes the quote

Small scope
Single app, focused scope, smaller surface. 5-7 working days.
Medium scope
Multi-role platform, several user types, integrations. 8-12 working days.
Enterprise scope
Complex environment, multiple targets, compliance evidence. 12-25 working days.
Fixed-scope quote within 1 working day
No surprise invoices, no scope-creep. We commit to a number before you commit to us.
Sample report
See exactly what we deliver
Download a redacted RedSecLabs penetration test report. Same format, same depth, same clarity as the report your team will receive.
Download sample report
Why RedSecLabs

Grounded reasons clients choose us

UK-based team
Testers based in the UK. Data stays within UK/EU jurisdiction for sensitive engagements.
CREST member company
CREST-accredited methodology. Senior testers hold CREST CRT or CCT certifications.
Manual testing, not scanner-only
Automated scanners catch the obvious. Our human testers find the issues that matter.
Clear executive reporting
Reports your board can read and your developers can act on. No jargon padding.
Compliance-aware delivery
PCI, SOC 2, ISO 27001, DORA, GDPR. We map findings to your compliance framework.
Retest support included
Free retest of remediated findings within agreed window. Confirmation letter for auditors.
Related services

Often paired with this engagement

Web App Pentesting
CREST methodology applied to applications.
Network Pentesting
CREST methodology for infrastructure.
Red Team Assessment
CREST-accredited adversary simulation.
DORA TLPT
For DORA-regulated financial entities.
SWIFT CSP
For SWIFT-connected financial institutions.
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