EBIOS — Lesson 3: Operational Scenarios, Attack Paths, Likelihood, Impact, and Existing Security Measures

Learning Objectives

• Explain how operational Scenarios, Attack Paths, Likelihood, Impact, and Existing Security Measures changes governance, risk, operations, and assurance within a digital service owner analyzing strategic and operational cyber-risk scenarios with business, technical, and supplier stakeholders.
• Produce operational attack-path analysis using defined inputs, owners, tests, and acceptance criteria.
• Investigate attack-path likelihood is asserted without supporting evidence, isolate the cause, and prove the recovery outcome.

Detailed Topics

• Operational Scenarios
• Attack Paths
• Likelihood
• Impact
• Existing Security Measures
• Decision ownership, prerequisites, and acceptance evidence for operational Scenarios, Attack Paths, Likelihood, Impact, and Existing Security Measures
• Security, compliance, resilience, documentation, and support implications for EBIOS workshop analysis

Instructor Demonstration

A guided demonstration applies operational Scenarios, Attack Paths, Likelihood, Impact, and Existing Security Measures to a digital service owner analyzing strategic and operational cyber-risk scenarios with business, technical, and supplier stakeholders. The instructor captures operational attack-path analysis, explains decision trade-offs, and shows how evidence exposes the condition where attack-path likelihood is asserted without supporting evidence.

Hands-On Exercise

Work through a realistic activity for operational Scenarios, Attack Paths, Likelihood, Impact, and Existing Security Measures in a digital service owner analyzing strategic and operational cyber-risk scenarios with business, technical, and supplier stakeholders. Build operational attack-path analysis, detect the point where attack-path likelihood is asserted without supporting evidence, correct it without bypassing governance, and preserve before-and-after evidence.

1. Confirm the requirement, stakeholders, environment, assumptions, inputs, and expected result.
2. Perform the EBIOS workshop analysis workflow and capture evidence before and after each material decision.
3. Test normal, boundary, failure, security, compliance, recovery, and operational conditions where relevant.
4. Document the root cause, correction, rollback, owner, support action, and next improvement priority.

Scenario Analysis

• Identify the business or assurance decision required within a digital service owner analyzing strategic and operational cyber-risk scenarios with business, technical, and supplier stakeholders.
• Compare control strength, evidence quality, operational impact, cost, resilience, and stakeholder trade-offs.
• Define escalation, communication, recovery, acceptance, and follow-up requirements for operational attack-path analysis.

Troubleshooting Guidance

For the condition where attack-path likelihood is asserted without supporting evidence, confirm scope, ownership, inputs, timing, dependencies, and evidence. Use operational attack-path analysis to locate the earliest divergence, correct the root cause, and document residual risk.

Validation Checklist

• operational attack-path analysis identifies the approved baseline, accountable owner, inputs, and expected result.
• Evidence confirms operational Scenarios, Attack Paths, Likelihood, Impact, and Existing Security Measures under normal and relevant exception conditions.
• The response to “attack-path likelihood is asserted without supporting evidence” is reversible, tested, and supported by before-and-after records.
• Residual EBIOS workshop analysis risk, support ownership, deadlines, and the next action are recorded.

Lesson Outcome

Learners can apply Operational Scenarios, Attack Paths, Likelihood, Impact, and Existing Security Measures, explain the choices made, and defend the result using operational attack-path analysis.