What is Shim? What is Shim? A layer of host-based intrusion detection and prevention code placed between existing layers of code on a host that intercepts data and analyzes it. Related Resources Solution Omnis Security Omnis Network Security is a holistic cybersecurity platform for comprehensive network visibility, threat detection, investigation, and protection. Learn more Blog ASERT NETSCOUT’s network security experts provide world-class cyber security research and threat analysis for the benefit of today’s enterprise and network operators. Learn more