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Hayabusa- Windows event log analyzer & threat hunting tool

Windows event log fast forensics timeline generator and threat hunting tool


Hayabusa is a Windows event log fast forensics timeline generator and threat hunting tool created by the Yamato Security group in Japan. Hayabusa means “peregrine falcon” in Japanese and was chosen as peregrine falcons are the fastest animal in the world, great at hunting and highly trainable. It is written in Rust and supports multi-threading in order to be as fast as possible. We have provided a tool to convert sigma rules into hayabusa rule format. The hayabusa detection rules, like sigma, are also written in YML in order to be as easily customizable and extensible as possible. It can be run either on running systems for live analysis or by gathering logs from multiple systems for offline analysis. (At the moment, it does not support real-time alerting or periodic scans.) The output will be consolidated into a single CSV timeline for easy analysis in Excel or Timeline Explorer.

Main goals

Threat hunting

Hayabusa currently has over 1000 sigma rules and around 50 hayabusa rules with more rules being added regularly. The ultimate goal is to be able to push out hayabusa agents to all Windows endpoints after an incident or for periodic threat hunting and have them alert back to a central server.

Fast forensics timeline generation

Windows event log analysis has traditionally been a very long and tedious process because Windows event logs are 1) in a data format that is hard to analyze and 2) the majority of data is noise and not useful for investigations. Hayabusa’s main goal is to extract out only useful data and present it in an easy-to-read format that is usable not only by professionally trained analysts but any Windows system administrator. Hayabusa is not intended to be a replacement for tools like Evtx Explorer or Event Log Explorer for more deep-dive analysis but is intended for letting analysts get 80% of their work done in 20% of the time.


  • Cross-platform support: Windows, Linux, macOS
  • Developed in Rust to be memory safe and faster than a hayabusa falcon!
  • Multi-thread support delivering up to a 5x speed improvement!
  • Creates a single easy-to-analyze CSV timeline for forensic investigations and incident response
  • Threat hunting based on IoC signatures written in easy to read/create/edit YML based hayabusa rules
  • Sigma rule support to convert sigma rules to hayabusa rules
  • Currently it supports the most sigma rules compared to other similar tools and even supports count rules
  • Event log statistics (Useful for getting a picture of what types of events there are and for tuning your log settings)
  • Rule tuning configuration by excluding bad rules or noisy rules


You can download the latest Hayabusa version from the Releases page.

You can also git clone the repository with the following command and compile binary from source code.:

git clone

Command line options


    -d --directory=[DIRECTORY] 'Directory of multiple .evtx files'
    -f --filepath=[FILEPATH] 'File path to one .evtx file'
    -r --rules=[RULEDIRECTORY] 'Rule file directory (default: ./rules)'
    -o --output=[CSV_TIMELINE] 'Save the timeline in CSV format. Example: results.csv'
    -v --verbose 'Output verbose information'
    -D --enable-deprecated-rules 'Enable sigma rules marked as deprecated'
    -n --enable-noisy-rules 'Enable rules marked as noisy'
    -m --min-level=[LEVEL] 'Minimum level for rules (default: informational)'
    --start-timeline=[STARTTIMELINE] 'Start time of the event to load from event file. Example: '2018/11/28 12:00:00 +09:00''
    --end-timeline=[ENDTIMELINE] 'End time of the event to load from event file. Example: '2018/11/28 12:00:00 +09:00''
    --rfc-2822 'Output date and time in RFC 2822 format. Example: Mon, 07 Aug 2006 12:34:56 -0600'
    --rfc-3339 'Output date and time in RFC 3339 format. Example: 2006-08-07T12:34:56.485214 -06:00'
    -u --utc 'Output time in UTC format (default: local time)'
    -t --thread-number=[NUMBER] 'Thread number (default: optimal number for performance)'
    -s --statistics 'Prints statistics of event IDs'
    -q --quiet 'Quiet mode. Do not display the launch banner'
    -Q --quiet-errors 'Quiet errors mode. Do not save error logs.'
    --contributors 'Prints the list of contributors'

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