CrimsonEDR is an open-source project designed to simulate the behavior of AV/EDR for malware development training.It offers various detection methods to identify malware patterns and evade Endpoint Detection and Response (EDR).Features include detecting direct syscall usage, NTDLL unhooking, AMSI and ETW patch detection, PE stomping, reflective PE loading, and more.To use CrimsonEDR, it requires installation and usage steps as outlined in the documentation provided.