Add rule to detect makecab staging of LOLBins #5254
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Adds a new Sigma rule for detecting makecab.exe usage to stage known LOLBins (regsvr32.exe, rundll32.exe, mshta.exe, certreq.exe). This behavior was previously uncovered by existing rules. The rule was field-tested with Chainsaw against real-world Sysmon logs and tuned for reliability: zero false positives in clean baselines, strong signal in known attack traces. YAML schema, field names, and detection logic follow current project conventions. Happy to adjust structure or placement based on team feedback.
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Welcome @alexegorov1 👋
It looks like this is your first pull request on the Sigma rules repository!
Please make sure to read the SigmaHQ conventions document to make sure your contribution is adhering to best practices and has all the necessary elements in place for a successful approval.
Thanks again, and welcome to the Sigma community! 😃
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Summary of the Pull Request
Adds a new Sigma rule for detecting makecab.exe usage to stage known LOLBins (regsvr32.exe, rundll32.exe, mshta.exe, certreq.exe). This behavior was previously uncovered by existing rules. The rule was field-tested with Chainsaw against real-world Sysmon logs and tuned for reliability: zero false positives in clean baselines, strong signal in known attack traces. YAML schema, field names, and detection logic follow current project conventions. Happy to adjust structure or placement based on team feedback.
Changelog
new: Suspicious Makecab Usage Against Known LOLBins
Example Log Event
Fixed Issues
SigmaHQ Rule Creation Conventions