Worked on enhancing security rule accuracy within the sublime-security/sublime-rules repository by addressing a critical bug in ShareFile impersonation detection. Focused on refining the domain-based parent-organization check to correctly recognize progress.com, this update improved the reliability of impersonation detection across customer environments. The solution involved precise YAML configuration and the development of targeted security rules, ensuring minimal risk while increasing detection accuracy. Collaborated effectively through code review and clear contributor attribution, demonstrating ownership of the fix. The work emphasized careful adjustment rather than broad changes, reflecting a methodical approach to security reliability using YAML and domain-specific rule development.