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chore: update evtx baseline to v0.8.2#5679

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phantinuss merged 26 commits intomasterfrom
ci/update-evtx-checker
Oct 9, 2025
Merged

chore: update evtx baseline to v0.8.2#5679
phantinuss merged 26 commits intomasterfrom
ci/update-evtx-checker

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@phantinuss phantinuss commented Oct 6, 2025

Summary of the Pull Request

Changelog

chore: update evtx baseline to v0.8.2 and fix FPs

Example Log Event

Fixed Issues

SigmaHQ Rule Creation Conventions

  • If your PR adds new rules, please consider following and applying these conventions

@github-actions github-actions bot added the Maintenance Related to additions and update of the repository features label Oct 6, 2025
@phantinuss phantinuss force-pushed the ci/update-evtx-checker branch from 9e87732 to 1251507 Compare October 6, 2025 10:43
@swachchhanda000 swachchhanda000 self-assigned this Oct 6, 2025
@swachchhanda000 swachchhanda000 added Bug Indicates a bug with one of the tools and features provided by the project Work In Progress Some changes are needed labels Oct 6, 2025
@swachchhanda000 swachchhanda000 marked this pull request as draft October 6, 2025 11:32
@swachchhanda000 swachchhanda000 added Review Needed The PR requires review and removed Work In Progress Some changes are needed labels Oct 8, 2025
@swachchhanda000 swachchhanda000 marked this pull request as ready for review October 8, 2025 04:53
@swachchhanda000 swachchhanda000 added the False-Positive Fix Pull Request fixes a false positive with one of the rules label Oct 8, 2025
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Pull Request Overview

This PR updates the EVTX baseline to version 0.8.2, which includes numerous filter refinements across Sigma detection rules to reduce false positives while maintaining detection coverage.

  • Updates EVTX baseline version reference in workflows
  • Adds comprehensive filters for legitimate software including antivirus products (Avira, AVG, Avast), Microsoft applications, and common development tools
  • Refines existing filters with more specific path matching and additional legitimate process exclusions

Reviewed Changes

Copilot reviewed 65 out of 65 changed files in this pull request and generated 2 comments.

Show a summary per file
File Description
.github/workflows/goodlog-tests.yml Updates EVTX baseline version to v0.8.2
.github/workflows/known-FPs.csv Adds new known false positive patterns and consolidates existing ones
rules/windows/registry/registry_set/* Adds filters for legitimate applications and refines existing detection logic
rules/windows/process_creation/* Enhances filters for common software installations and system processes
rules/windows/image_load/* Improves sideloading detection with better legitimate application exclusions
rules/windows/file/file_event/* Refines file creation monitoring with enhanced system process filters
rules/windows/builtin/* Updates security event filters for legitimate administrative activities
rules/windows/powershell/* Enhances PowerShell monitoring with better module loading filters
rules-threat-hunting/* Moves NTFS short name detection rule to threat hunting category

Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
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LGTM

@swachchhanda000 swachchhanda000 added Awaiting Requested Review A review was requested from one of the maintainers and removed Review Needed The PR requires review labels Oct 9, 2025
@nasbench nasbench added Ready to Merge and removed Awaiting Requested Review A review was requested from one of the maintainers labels Oct 9, 2025
@phantinuss phantinuss added this to the Sigma-October-Release milestone Oct 9, 2025
@phantinuss phantinuss merged commit b242175 into master Oct 9, 2025
12 checks passed
@nasbench nasbench deleted the ci/update-evtx-checker branch October 23, 2025 21:12
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Bug Indicates a bug with one of the tools and features provided by the project False-Positive Fix Pull Request fixes a false positive with one of the rules Maintenance Related to additions and update of the repository features Ready to Merge

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5 participants