sublime-security/sublime-rules
Mar 2025 – Sep 2025
5 Months active
Languages Used
YAML
Technical Skills
SecurityThreat DetectionDetection Rule EngineeringSecurity AnalysisDetection Rule DevelopmentEmail Security
Brandon 2: Brandon Harder
PROFILE
Brandon 2: Brandon Harder
Worked on the sublime-security/sublime-rules repository, delivering five new detection features and two targeted bug fixes over five months. Focused on enhancing email security by refining detection rules for impersonation, scam, credential phishing, QR code abuse, and SharePoint file sharing. Leveraged YAML for rule configuration and regular expressions for precise pattern matching, implementing trusted-domain exclusions and DMARC-based checks to reduce false positives and alert fatigue. Each update emphasized maintainability, clear version control, and CI-friendly changes, enabling faster triage and improved detection accuracy. Demonstrated strong skills in detection engineering, security analysis, and rule development to strengthen threat detection coverage.
Overall Statistics
Feature vs Bugs
71%Features
Repository Contributions
8Total
Bugs
2
Commits
8
Features
5
Lines of code
80
Activity Months5
Your Network
51 peopleWork History
September 2025
2 Commits • 2 Features
Sep 1, 2025September 2025 monthly summary for sublime-security/sublime-rules. This month focused on two high-value feature refinements to improve detection accuracy and reduce alert noise in security operations. Key features delivered: - SharePoint secure file linking detection rule refinement: switched sender lookup from profile.by_sender() to profile.by_sender_email(), increasing accuracy in identifying potentially malicious or unsolicited file sharing. (Commit: 81f4c3096039af651719585c12f2a10babdf2392; related to #3172) - Credential phishing detection regex refinement: refined rule to ensure 'w2' is matched as a whole word, reducing false positives from substrings in financial/urgent subject lines in emails. (Commit: 73dd8975ec20fff3b21dbe23d604b8015531d9c4; related to #3197) Major bugs fixed: - No critical defects reported this month; efforts concentrated on targeted rule refinements with low-risk, CI-friendly changes. Overall impact and accomplishments: - Improved detection precision and quality of alerts, enabling faster triage and reducing operator fatigue. - Changes are YAML rule updates with clear versioning and traceability, ready for review and deployment with minimal risk. Technologies/skills demonstrated: - YAML-based rule configuration and rule-logic improvements - Regex refinement for high-precision matching - Sender profile lookup optimization - Thorough commit-level traceability and documentation (referencing #3172 and #3197)
2 Commits • 2 Features
Sep 1, 2025September 2025 monthly summary for sublime-security/sublime-rules. This month focused on two high-value feature refinements to improve detection accuracy and reduce alert noise in security operations. Key features delivered: - SharePoint secure file linking detection rule refinement: switched sender lookup from profile.by_sender() to profile.by_sender_email(), increasing accuracy in identifying potentially malicious or unsolicited file sharing. (Commit: 81f4c3096039af651719585c12f2a10babdf2392; related to #3172) - Credential phishing detection regex refinement: refined rule to ensure 'w2' is matched as a whole word, reducing false positives from substrings in financial/urgent subject lines in emails. (Commit: 73dd8975ec20fff3b21dbe23d604b8015531d9c4; related to #3197) Major bugs fixed: - No critical defects reported this month; efforts concentrated on targeted rule refinements with low-risk, CI-friendly changes. Overall impact and accomplishments: - Improved detection precision and quality of alerts, enabling faster triage and reducing operator fatigue. - Changes are YAML rule updates with clear versioning and traceability, ready for review and deployment with minimal risk. Technologies/skills demonstrated: - YAML-based rule configuration and rule-logic improvements - Regex refinement for high-precision matching - Sender profile lookup optimization - Thorough commit-level traceability and documentation (referencing #3172 and #3197)
September 2025
August 2025
2 Commits • 1 Features
Aug 1, 2025For 2025-08, delivered major enhancements to the Enhanced Scam and Credential Phishing Detection Rules in sublime-security/sublime-rules. Consolidated two improvements into one feature, expanding keyword coverage, language patterns, attachment filtering, and link-analysis for credential phishing (including 'sign in' display text) to improve detection accuracy and coverage for email-based scams.
August 2025
2 Commits • 1 Features
Aug 1, 2025For 2025-08, delivered major enhancements to the Enhanced Scam and Credential Phishing Detection Rules in sublime-security/sublime-rules. Consolidated two improvements into one feature, expanding keyword coverage, language patterns, attachment filtering, and link-analysis for credential phishing (including 'sign in' display text) to improve detection accuracy and coverage for email-based scams.
July 2025
2 Commits • 2 Features
Jul 1, 2025July 2025 monthly summary for sublime-rules: Focused on strengthening impersonation and scam detection through DMARC-based checks and expanded phrase matching. Delivered two YAML-rule enhancements with clear commit traceability, improving detection accuracy and reducing risk from phishing and fraud.
2 Commits • 2 Features
Jul 1, 2025July 2025 monthly summary for sublime-rules: Focused on strengthening impersonation and scam detection through DMARC-based checks and expanded phrase matching. Delivered two YAML-rule enhancements with clear commit traceability, improving detection accuracy and reducing risk from phishing and fraud.
July 2025
April 2025
1 Commits
Apr 1, 2025April 2025 monthly summary for sublime-security/sublime-rules: targeted bug fix to QR code detection; no new features delivered this month; improvements to detection accuracy and alert quality through trusted-domain exclusions.
April 2025
1 Commits
Apr 1, 2025April 2025 monthly summary for sublime-security/sublime-rules: targeted bug fix to QR code detection; no new features delivered this month; improvements to detection accuracy and alert quality through trusted-domain exclusions.
March 2025
1 Commits
Mar 1, 2025March 2025: Focused rule maintenance in sublime-security/sublime-rules to improve impersonation detection accuracy and reduce alert noise. Implemented a precise domain exclusion for legitimate traffic, ensuring Amazon Music domains are not flagged by impersonation checks, thereby increasing operator confidence and triage efficiency while preserving detection coverage.
1 Commits
Mar 1, 2025March 2025: Focused rule maintenance in sublime-security/sublime-rules to improve impersonation detection accuracy and reduce alert noise. Implemented a precise domain exclusion for legitimate traffic, ensuring Amazon Music domains are not flagged by impersonation checks, thereby increasing operator confidence and triage efficiency while preserving detection coverage.
March 2025
Activity
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Quality Metrics
Correctness80.0%
Maintainability87.6%
Architecture77.6%
Performance85.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
YAML
Technical Skills
Detection EngineeringDetection Rule DevelopmentDetection Rule EngineeringEmail SecurityRegular ExpressionsRule DevelopmentRule EngineeringSecuritySecurity AnalysisSecurity EngineeringSecurity Rule DevelopmentThreat DetectionYAML
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