About Us

YellowHak was founded by a team of cybersecurity professionals, ethical hackers, and red teamers with a single mission: to deliver the most authentic and adversary-focused security testing available. We specialize in simulating real-world attacks to help organizations harden their infrastructure, applications, and people.

Our Story

YellowHak emerged from the shared vision of security researchers who believed that traditional penetration testing was no longer enough. With the rise of sophisticated threats and ever-evolving attack techniques, our founders—former ethical hackers and red teamers—set out to build a company that emulates real adversaries, not just automated scans.

Our journey began in 2023, conducting stealth red team operations and breach simulations across Europe and Latin America. With each project, our reputation grew as the team that doesn't just find vulnerabilities—but proves their impact, chain exploits, and bypass defenses with precision.

Our Team

Our team is composed of seasoned professionals with backgrounds in offensive security, malware development, threat emulation, and secure software engineering. Many hold top-tier certifications (e.g., OSCP, CRTP, eWPTX, CRTO) and have contributed to public research and zero-day discoveries.

Each member of YellowHak brings a unique perspective—from reverse engineering complex binaries to mimicking APT tactics in Windows and Linux environments. Together, we form a multi-disciplinary force capable of simulating threat actors and nation-state techniques to help clients stay ahead of real threats.

Our Approach

At YellowHak, we go beyond checklists and vulnerability scanners. Our methodology is adversary-driven, tailored to your environment, and aligned with frameworks like MITRE ATT&CK and TIBER-EU. We simulate real attacks by combining initial access (phishing, exposed services), lateral movement, privilege escalation, and data exfiltration—without disrupting your operations. Every assessment ends with a technical report, executive summary, and a debrief session to help your team learn, respond, and improve.

We believe security is not a product but a continuous process, and we’re here to be your offensive security partner at every step.