Becoming a victim of economic espionage is no longer uncommon for small and medium-sized enterprises. The more innovative a company is, the greater the risk of losing its competitive advantage through espionage. The pressure to innovate and increasing competition heighten the demand for security around a company's know-how. Security Information Event Management systems are management information systems that create a foundation for uncovering economic espionage activities. To protect your know-how, it is essential to be informed about security-relevant processes within the company. This paper discusses how to weave a safety net with SIEM systems to detect economic spies.