The data extracted by the internal auditor includes human resources data with employment conditions, payroll data, and entrance logs. With this information, the auditor can identify employees who are getting paid even though their employment has expired. By comparing the employment conditions and expiration dates in the HR data with the payroll data, the auditor can detect discrepancies where individuals continue to receive payments beyond their employment period. Entrance logs can help corroborate these findings by showing the lack of physical presence of these employees, further supporting the identification of ghost employees who no longer work for the organization but still appear on the payroll.

IIA Practice Guide: "Auditing Employee Benefits"

COSO Internal Control – Integrated Framework