PowerShell Native API Injection via C# Compilation
Detects PowerShell scripts that dynamically define and compile C# code to access Win32 APIs associated with process injection. This fileless technique is used by malware like Dead#Vax to inject shellcode (e.g., AsyncRAT) into the memory of legitimate processes, evading disk-based detection. The rule specifically looks for the use of `Add-Type` to compile C# code that imports functions from `kernel32.dll` and utilizes `VirtualAllocEx`, `WriteProcessMemory`, and `CreateRemoteThread`.
Microsoft Sentinel (KQL)
