Registry-Free Process Scope COR_PROFILER
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About the rule
Rule Type
Standard
Rule Description
Adversaries may leverage the COR_PROFILER environment variable to hijack the execution flow of programs that load the .NET CLR. The COR_PROFILER is a .NET Framework feature which allows developers to specify an unmanaged (or external of .NET) profiling DLL to be loaded into each .NET process that loads the Common Language Runtime (CLR). These profiliers are designed to monitor, troubleshoot, and debug managed code executed by the .NET CLR. (Citation: Microsoft Profiling Mar 2017) (Citation: Microsoft COR_PROFILER Feb 2013)
Severity
Trouble
Rule Requirement
Criteria
Action1: actionname = "PowerShell Script Block Logged" AND SCRIPTEXECUTED contains "$env:COR_ENABLE_PROFILING" AND SCRIPTEXECUTED contains "$env:COR_PROFILER" AND SCRIPTEXECUTED contains "$env:COR_PROFILER_PATH" select Action1.HOSTNAME,Action1.MESSAGE,Action1.SCRIPTEXECUTED
Detection
Execution Mode
realtime
Log Sources
Windows
Author
frack113
