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There is no standard techniques to identify a fraud and even red flags literature is also still evolving in internal audit world. But your skills and questioning and skepticism with analytical expertise can contribute to get focused in suspicions and get insight.
Detail study of process which is most risky. Conduct a forensic audit of the process in deep. Find out the loop holes in the process where, there are chances of conducting fraud by anyone. Fix those loop holes or bring on some control to prevent & detect fraud.