DotNet CLR DLL Loaded By Scripting Applications

SigmaHQ Detections@sigmaHQ

•updated Oct 23, 2025•0•21

Detects the loading of .NET Common Language Runtime (CLR) DLLs by scripting applications such as wscript, cscript, or mshta. This behavior can indicate suspicious execution, potentially involving techniques like DotNetToJScript or Donut, which use scripting hosts to execute .NET assemblies in memory. The rule specifically looks for `clr.dll`, `mscoree.dll`, or `mscorlib.dll` being loaded by a predefined list of scripting or utility executables.