Hello, I’m Ronald Barbosa.

I'm a Senior & Certified Red Team Operator and Offensive Security Specialist with hands-on experience in Adversary Simulation, Penetration Testing (Web, Mobile, API, Infra & Wi-Fi), and exploit development.

I've worked with major security firms and hold advanced certifications such as CRTO, eWPTXv2, DCPT and SYCP. I’m also credited with multiple CVEs, showcasing my offensive research capabilities.


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Linkedin

www.linkedin.com

Beacons:

f4_zzz - Link in Bio & Creator Tools | Beacons

YouTube:

F4


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Skills

Skills


Certifications

Skills (1)


Articles

Actionable insights, hard-earned lessons, and original perspectives on offensive security from advanced red team tradecraft to real-world exploitation techniques.

CVE-2023-27218 — Shotcut XXE → SSRF via Malicious .mlt Project Files | Notion

Linux Privilege Escalation | Notion

Linux | /etc/passwd & /etc/shadow | Notion

Mobile Pentest Environment Setup Guide | Notion

Trello - Information Leakage | Notion


MyLabs

Custom labs I’ve created for the “https://boitatech.com/” Community CTF and personal study. These labs are designed to simulate real-world attack scenarios for learning and challenge-based training.

F4Tools Write-Up | AratuCTF | Notion

Python SSS | Python Super Secure Server | Notion

Python SSB | Python Super Secure Bot | Notion

PHP SSS Write-Up | AratuCTF | Notion


Write-Ups

Detailed walkthroughs of CTF challenges, and advanced lab environments.