@Mrtuxracer Talks About Monitoring Endpoints, Binary Exploitation, Continuous Recon and More!

## Overview Mrtuxracer (Julian), a full-time bug bounty hunter and HackerOne MVH (Master of Bug Bounty Hunting) belt holder, discusses his endpoint monitoring methodology, binary exploitation expertise, educational path, and professional insights into competitive bug bounty hunting.

## Key Topics

**Continuous Endpoint Monitoring & Reconnaissance** Julian's approach differs from traditional subdomain-focused recon. He uses three to four automated programs to continuously monitor endpoints discovered in JavaScript files rather than hunting new subdomains. His custom tool daily fetches and analyzes JavaScript files, compares content length and response times, and alerts him via Slack and email when changes occur. Upon alerts, he manually investigates exploitability.

**Parameter Discovery & Wordlist Building** He relies heavily on fuff for brute-forcing HTTP requests. His wordlists use two-tiered approach: a baseline containing common paths (git directories, config files, backups) and target-specific lists built by extracting frequently-occurring words from source code. While leveraging Seclists, he extensively customizes. He notes 90% of his work uses fuff.

**Binary Exploitation & Reverse Engineering Background** Julian transitioned from reverse engineering (10 years ago) to web app security after discovering PayPal's bug bounty program, earning his first $500 for an XSS. He prioritizes three binary exploitation areas: privilege escalation, file import fuzzing, and custom URI handler exploitation. He recommends Coralan tutorials for foundational processor/memory concepts, then assembly language before pursuing binary bounties. He recently discovered 10-11 zero-days earning multiple CVEs.

**Education & Certifications** Self-taught with no university degree, Julian earned OCP (Offensive Security Certified Professional) after one year of study. He's pursuing OCE and recommends OCP for those with fundamentals but not beginners. He emphasizes the "try harder" mindset is valuable despite pentest-to-bounty methodology differences (pentest involves pivoting; bounties don't allow this).

**Initial Reconnaissance Workflow** For new targets, Julian uses Sonar project data, Subfinder, and Nmap for subdomain enumeration and port scanning. He screenshots all HTTP services, analyzes Nmap metadata and HTTP titles, then focuses on interesting hosts. He performs vhost enumeration by testing dead/unresolved subdomains against live IPs, discovering hidden hosts. He extracts Google Analytics UIDs to identify additional company assets.

**Technical Tools & Methodology** Primary toolkit: Burp Suite Pro (describes as "best investment ever"), fuff, Python, nmap with custom NSE scripts, Sonar, Subfinder, and custom-built tools. He writes Burp extensions and Python scripts for automation. For RCE discovery, he uses "catch-all payloads" (sleep, DNS lookups) but acknowledges no universal rule exists.

## Takeaways

**Learning & Knowledge** Curiosity and self-directed learning (Google, reading, documentation) matter more than formal credentials. He learned everything through hands-on experience, not CTFs. Proper Googling skills and independent problem-solving are essential for beginners.

**Work-Life Balance** Julian maintains 20-60 hours weekly depending on motivation and program interest. He prevents burnout through sports (fitness), vegetarian lifestyle, and side interests (stocks, card games). Yearly income goals matter more than monthly targets due to bounty variability.

**Beginner Guidance** Understand browser security fundamentals (same-origin policy) before attempting exploitation. Avoid pursuing bug bounties solely for money. Learn XSS, CSRF, SSRF fundamentals first. Wordlists and methodologies are proprietary assets representing years of work—don't expect them to be shared.

**Industry Outlook** He hopes larger institutions (insurance, banking) adopt bug bounty programs in the next 3-5 years. Transitioning from pentesting to bounties isn't difficult since reconnaissance methodology overlaps; the difference is bounties skip network pivoting.