This detection rule identifies suspicious activity involving the creation of new DLL assembly files when the 'aspnet_compiler.exe' process is executed. This behavior may indicate an attempt to misuse the ASP.NET compiler to create assemblies that can be executed as part of an attack. The detection checks for events where 'aspnet_compiler.exe' generates files in specific directories associated with temporary ASP.NET files and ensures that any new files created end with '.dll'. The underlying assumption is that such file creation could signify exploitation of legitimate compilation processes, thus serving as an indicator of potential malicious activity. The rule is designed to work in Windows environments and leverages data logs captured during file events. Its applicability is heightened by the importance of monitoring ASP.NET-related processes, given the exposure they can represent to web applications.