Financial organisations should start by defining scope around critical business functions, key systems, and applications that could affect operations or stability if compromised. They should then build threat intelligence that includes attacker profiles and attack graphing, so test scenarios reflect realistic threat paths. Finally, they should align objectives, roles, timelines, and rules of engagement before execution.
How to scope a TLPT exercise under DORA
Preparation starts with scoping the exercise to the business services that matter most to operational continuity. For financial organisations, that means mapping critical business functions to the systems, applications, data flows, and third parties that could disrupt stability if compromised. The point is not broad coverage, but a test design that reflects how real harm would propagate through the institution.
That scoping step should be anchored in service dependencies, not just asset inventories. A useful TLPT scope identifies where compromise would affect payment processing, customer access, trading, liquidity, or regulatory reporting, and then traces the technology path that supports those functions. This prevents a test from becoming a generic red team event with weak business relevance.
Because DORA ties operational resilience to realistic testing, the scope should also define what is out of bounds. Narrowing the test to the most consequential functions avoids noise, reduces unnecessary operational risk, and makes it easier to interpret findings against the organisation’s resilience objectives. EU Digital Operational Resilience Act (DORA)
How to build realistic threat-led scenarios
Threat-led testing is only credible when the scenario reflects a plausible adversary, realistic attack paths, and the organisation’s actual exposure. That means using threat intelligence to define attacker profiles, likely objectives, and the sequence of actions that could move from initial foothold to business impact. Attack graphing helps convert that intelligence into a testable path rather than a loose narrative.
Financial organisations should avoid overfitting scenarios to one-off incidents or headline breaches. The better approach is to identify the threat classes most relevant to the institution, such as credential theft, lateral movement, abuse of remote access, compromise of trusted vendors, or exploitation of exposed internet-facing services, and then shape the exercise around those behaviours. This makes the outcome more useful for control validation and board-level resilience assurance. CISA cyber threat advisories
For teams building the scenario library, it helps to keep the exercise grounded in the most likely kill chain, not the most dramatic one. If the path to impact depends on a control gap, privilege boundary, or supplier dependency, the scenario should explicitly exercise that weakness so the test answers a real resilience question rather than a theoretical one.
What to align before execution
Before execution, the organisation should lock down governance for the test itself: objectives, roles, escalation paths, timelines, communications, and rules of engagement. TLPT is not just a technical activity, it is a controlled operational exercise that can affect production systems, support teams, and incident response functions if the guardrails are unclear.
The most effective preparation includes a clear success criterion for each scenario, agreed points of contact for business and technical responders, and a decision rule for pausing or stopping the exercise if unexpected operational impact appears. This is especially important in financial services, where a poorly coordinated test can create confusion between genuine incident response and exercise management. Ultimate Guide to NHIs, Regulatory and Audit Perspectives
Documentation matters because DORA-style testing is judged not only by what was tested, but by whether the organisation can demonstrate control over the process. Teams should be able to show why the scope was chosen, who approved it, how the scenario was derived, and how the exercise was contained. That discipline improves the quality of the findings and reduces the chance that the test becomes a disruption exercise instead of a resilience test. Identity Security Regulatory Map
Risk and Threat Considerations
A weak TLPT preparation process creates two kinds of risk: false confidence from an unrealistic scenario, and operational disruption from a poorly controlled exercise. If the scope misses critical dependencies or the threat model is too generic, the test may validate the wrong controls. If the governance is loose, the exercise can affect live services, create confusion during response, or expose sensitive findings too broadly.
Failure mechanism: The organisation either tests a narrow technical slice that never reaches the business function, or it runs a realistic scenario without sufficient containment, communications, and decision authority.
Impact: In the first case, leadership learns little about true resilience; in the second, the exercise can itself become an availability or coordination incident, undermining trust in the testing programme.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
MITRE ATT&CK addresses the attack surface, NIST CSF 2.0 sets the technical controls, and DORA defines the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| DORA | Operational resilience testing | DORA requires resilience testing that reflects critical ICT risk and business impact. |
| Recommendation — Scope tests to critical functions and validate realistic threat paths under controlled conditions. | ||
| NIST CSF 2.0 | ID.RA-01 — Asset Vulnerabilities Are Identified and Recorded | TLPT scoping depends on identifying systems and dependencies that could affect operations. |
| GV.RM-01 — Risk Management Strategy | Threat-led testing is a risk-driven exercise aligned to resilience objectives. | |
| PR.IR-01 — Networks and Environments Are Segregated | Containment and rules of engagement depend on limiting exercise impact on production operations. | |
| Recommendation — Map critical services and dependencies before designing test scenarios. Set test objectives from business risk and resilience priorities. Define boundaries and stop conditions to prevent test activity from disrupting live services. | ||
| MITRE ATT&CK | TA0001 — Initial Access | Threat-led scenarios should model realistic attacker entry paths to the institution. |
| Recommendation — Use attacker entry techniques to build credible test paths. | ||
Practitioner Guidance
What to prioritise: Start with the business service map, then work backward to the systems, suppliers, and access paths that can credibly affect that service. If the scope cannot be tied to a critical function, it is too abstract for TLPT.
What to verify: Confirm that the scenario, approvals, and stop conditions are signed off before testing begins, and that the response teams know whether they are handling an exercise or a real incident. That distinction matters more than the sophistication of the attack chain.
Practitioner takeaway: Good TLPT preparation is less about simulating every threat and more about proving that the organisation can safely test the pathways most likely to cause material operational harm.
Related resources from NHI Mgmt Group
- Why do organisations need continuous penetration testing to support DORA and GDPR obligations?
- How should financial institutions prepare for DORA compliance across ICT risk, incident reporting, and resilience testing?
- What breaks when financial organisations rely on a single ICT provider for critical processes under DORA?
- Why does breach containment matter so much under DORA for financial organisations?
Deepen Your Knowledge
Reviewed and updated by the NHIMG editorial team on September 29, 2026.
NHI Mgmt Group — the #1 independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org
