ProcFilter is a process filtering system for Windows with built-in YARA integration. YARA rules can be instrumented with custom meta tags that tailor its response to rule matches. It runs as a Windows service and is integrated with Microsoft's ETW API, making results viewable in the Windows Event Log. Installation, activation, and removal can be done dynamically and does not require a reboot.ProcFilter's intended use is for malware analysts to be able to create YARA signatures that protect their Windows environments against a specific threat. It does not include a large signature set. Think lightweight, precise, and targeted rather than broad or all-encompassing. ProcFilter is also intended for use in controlled analysis environments where custom plugins can perform artifact-specific actions.