Microsoft Defender Antivirus (MDA) is a crucial security solution deeply integrated into Windows systems since Windows 7. With two main components, Microsoft Defender for Endpoint and Microsoft Defender Antivirus (MDA), the latter is analyzed in this content. MDA has drawn attention from security researchers due to its widespread use. Researchers have focused on specific components such as emulators, minifilter drivers, and signature formats. The MDA architecture includes modules in kernel and user mode, with components like WdBoot.sys for system integrity checks and MsMpEng.exe for real-time protection. The focus of this analysis is on MDA signatures, specifically on understanding their structure, types, and loading processes. Through workshops and workshops materials, the goal is to provide valuable insights for security teams and organizations.
https://retooling.io/blog/an-unexpected-journey-into-microsoft-defenders-signature-world