Hayabusa is a Windows event log fast forensics timeline generator and threat hunting tool created by the Yamato Security group in Japan. It is written in Rust, supports multi-threading for speed, and offers Sigma-compatible detection rules in YML format for easy customization and extensibility. It can be used for live analysis on single systems, offline analysis on multiple systems, or enterprise-wide threat hunting with Velociraptor, providing a consolidated CSV timeline output for analysis in various tools like LibreOffice, Timeline Explorer, Elastic Stack, and Timesketch.