WELA (Windows Event Log Auditor) ゑ羅

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About WELA

WELA (Windows Event Log Analyzer, ゑ羅) is a tool for auditing Windows Event Log settings and log file sizes. Windows Event Logs are a vital source of information for Digital Forensics and Incident Response (DFIR), providing visibility into system activity and security events. However, default configurations often lead to problems such as limited log retention, insufficient audit policies, and blind spots that reduce detection capability. WELA helps uncover these weaknesses and offers practical recommendations to improve audit settings and enhance security visibility. It also assesses log configurations based on real-world Sigma rule coverage, allowing users to evaluate what can—or cannot—be detected undercurrent settings.

Companion Projects

• EnableWindowsLogSettings Yamato Security's Windows Event Log Configuration Guide.
• EventLog-Baseline-Guide A tool to visualize detection gaps in Sigma rules and major guides.
• WELA-RulesGenerator A tool for generating WELA's Sigma rule-related config files.

Table of Contents

• About WELA
• Companion Projects
• Table of Contents
• Screenshots
• Features
• Downloads
• Command List
• Command Usage
  • audit-settings
  • audit-filesize
  • update-rules
• Other Windows Event Log Audit Settings Related Resources
• Contribution
• Bug Submission
• License
• Contributors
• Acknowledgements
• Twitter

Screenshots

Startup

audit-settings (stdout)

audit-settings (gui)

audit-settings (table)

audit-filesize

Features

• Audit Windows Event Log Audit policy settings.
• Checking based on the major Windows Event Log Audit configuration guides.
• Checking Windows Event Log audit settings based on real-world Sigma rule detectability.
• Audit Windows Event Log file sizes and suggest the recommended size.

Prerequisites

• PowerShell 5.1+
• Run PowerShell with Administrator privileges

Downloads

Please download the latest stable version of WELA from the Releases page.

Running WELA

1. Unzip the release zip file.
2. Open PowerShell with Administrator privileges.
3. ./WELA.ps1 help to run WELA.

Command List

• audit-settings: Check Windows Event Log audit policy settings.
• audit-filesize: Check Windows Event Log file size.
• update-rules: Update WELA's Sigma rules config files.

Command Usage

audit-settings

audit-settings command checks the Windows Event Log audit policy settings and compares them with the recommended settings from Yamato Security, Microsoft(Sever/Client), and Australian Signals Directorate (ASD). RuleCount indicates the number of Sigma rules that can detect events within that category.

audit-settings command examples

Check by YamatoSecurity(Default) recommend setting and save to CSV:

./WELA.ps1 audit-settings

Check by Australian Signals Directorate recommend setting and save to CSV:

./WELA.ps1 audit-settings -BaseLine ASD

Check by Microsoft recommend setting (Server) and Display results in GUI:

./WELA.ps1 audit-settings -BaseLine Microsoft_Server -OutType gui

Check by Microsoft recommend setting (Client) and Display results in Table format:

./WELA.ps1 audit-settings -BaseLine Microsoft_Client -OutType table

audit-filesize

audit-filesize command checks the Windows Event Log file size and compares it with the recommended settings from Yamato Security.

audit-filesize command examples

Check Windows Event Log file size by YamatoSecurity recommended settings and save to CSV:

./WELA.ps1 audit-filesize

update-rules

update-rulese command examples

Update WELA's Sigma rules config files:

./WELA.ps1 update-rules

Other Windows Event Log Audit Settings Related Resources

• A Data-Driven Approach to Windows Advanced Audit Policy – What to Enable and Why
• Audit Policy Recommendations
• Configure audit policies for Windows event logs
• EnableWindowsLogSettings
• Windows event logging and forwarding
• mdecrevoisier/Windows-auditing-baseline
• palantir/windows-event-forwarding

Contribution

We would love any form of contribution. Pull requests, rule creation, and sample logs are the best, but feature requests notifying us of bugs, etc... are also very welcome.

At the least, if you like our tools and resources, then please give us a star on GitHub and show your support!

Bug Submission

• Please submit any bugs you find here.
• This project is currently actively maintained, and we are happy to fix any bugs reported.

License

• WELA is released under MIT License

Contributors

• Fukusuke Takahashi (core developer)
• Zach Mathis (project leader, tool design, testing, etc...) (@yamatosecurity)

Acknowledgements

• Australian Cyber Security Centre: Windows event logging and forwarding
• Microsoft: Advanced security auditing FAQ
• SigmaHQ

Twitter

You can receive the latest news about WELA, rule updates, other Yamato Security tools, etc... by following us on Twitter at @SecurityYamato.