If a new internal auditor suspects fraud, the appropriate action is to document supporting information and recommend an investigation to the appropriate audit management, such as the chief audit executive (CAE). This approach maintains the auditor's objectivity and ensures that suspicions of fraud are handled by following the proper channels and procedures established within the organization for such matters.

IIA guidance on fraud and the auditor's role in fraud detection, which emphasizes the importance of documenting evidence and escalating fraud concerns through proper management channels.