Advanced fraud detection requires shifting from a reactive “investigation-after-alert” methodology to a proactive, systemic identification posture. Internal auditors evaluate fraud vulnerabilities by applying the Fraud Triangle model (Pressure, Opportunity, and Rationalization) and its modern expansion, the Fraud Diamond, which introduces Capability as a critical fourth dimension. Capability represents the individual’s specific technical skills, organizational authority, and institutional access required to execute and conceal complex financial manipulations without triggering baseline controls.
                    [Pressure: Financial or Performance Drivers]
                                        │
                                        â–¼
    [Opportunity: Weak Controls] ──► [FRAUD DIAMOND] ◄── [Rationalization: Justification]
                                        â–²
                                        │
                    [Capability: Technical Skills & System Access]

To build a proactive defense, the audit function establishes a formal Fraud Risk Register separate from standard operational risk logs. This register catalogues specific, hidden attack vectors, such as vendor split-billing schemes, ghost payroll generation, and algorithmic transaction overrides. The internal audit team evaluates the presence of mitigating controls—such as mandatory vacation blocks, automated access revocation logs, and independent transaction validation layers—to identify residual control gaps that require targeted testing.
 
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