As we step into the digital age, cyber security has become a major concern for individuals and businesses alike. With the rising frequency of cyber-attacks, businesses have suffered significant financial losses, data breaches, and reputational damage. My mission is to help organizations have more secure infrastructures, better utilize Open Source software in Security Operations, and enable businesses to improve the detection capacity and skills of their SOC/Incident Response teams.

Hello, world!
My name is Leszek Mis, and I am the founder of Defensive Security, a company that specializes in providing top-notch cyber security Attack, Detection, and Live Forensics education hands-on programs, and Purple Team services to individuals and businesses of all sizes. I want to take you on a deep ride of Linux Attack, Detection, Hunting, and Live Forensics at scale. I want to show you my approach.

Early 2000
My journey began when I was just a teenager, and I was fascinated by the world of computers. During the first years of finally having a 166Mhz Intel Pentium MMX, I spent hours learning about Linux internals and network, programming languages, hacking techniques, and defensive opportunities. Cool to note is that I read many times “Hacking Exposed” Book, even without having a first computer. What a time it was!

I have always been fascinated by both the offensive and defensive sides of the game. My passion for open-source technologies allowed me to do what I love, in a format that is fully aligned with my approach to living. Even after almost 20 years in the industry, I continue to stay hungry for new cyber knowledge and learn every single day. What about you?

Carrier path

I have worked for several companies, and over the years, it has been a wonderful adventure working with open-minded and smart people from Open-e, Linux Polska, B2B, Altkom Akademia, Expro, Interia, and Collective Sense. I am grateful to all of you, and especially Artur P and Marek F for the valuable Linux lessons I got from you.

Support, mission, and passion
When I realized that cyber security was my true passion, I started wanting to create my own company where the focus would be on the real-good skill level and understanding of Linux internals, and attacks including especially research on different types of C2, rootkits, and live forensics at scale, including memory forensics, with a MITRE on top, in two connected scopes: Cyber Range education and services. 

I believe that the Linux ecosystem takes a significant part in the modern offensive battlefield where every company can become a victim every single second, so we need to stay updated and I am here to help.

My company's mission is to provide the most advanced and reliable security educational services. I have assembled a team of experts in the field (joke!) In reality, I am responsible for everything except accounting and legal. I learn a lot and always look for new interesting stuff. Check out my LinkedIn profile to see what I am talking about. I am a one-man army, but I am supported by amazing people and friends from the cyber security community. I am especially supported by my wife and family. Love you ❤️

Hard work and desire to learn

Practically and technically, Defensive Security means Leszek is doing the project from scratch, connecting the dots, and finding a solution or approach to finally offering and showing it to you. For the very first time in the format of self-paced PurpleLabs programs. I started working tirelessly to develop cutting-edge, production-ready Cyber Range environment and modular laboratory scenarios in the format of attack vs detection/forensics. All this is to protect your digital assets and show you a way of understanding the modern landscape of Linux threats.

Dreams don't come true, you make dreams come true

Over time, my company gained a reputation for excellence, and I started getting contracts with some of the largest companies. I traveled many times to the US, Singapore, Belgium, Amsterdam, and the UK where I delivered live training sessions during events like BruCON, Hack In The Box, Black Hat, and 44CON. Then I fulfilled one of my greatest dreams, and it was all thanks to the Open Source Community, people, passion for research, and my desire to learn.

Stay up to date and be curious

My dedication to my client's needs drives me to innovate constantly, train everyday approaches, and research. I always want to know in hands-on ways how attack and detection work, on which layer the bypass is possible, what telemetry is needed to better understand the context and more. Such an approach allows me to stay up to date with the latest threats and understand more to see the bigger picture.
 
Grow up with me

PurpleLabs modular training programs are designed to provide you with a practical learning experience that focuses on merit without blindly researching concepts. I assure you that after 90 days of training at PurpleLabs, you will be able to do Linux things that you never even dreamed of becoming true. The training program covers a wide range of offensive topics. From the blue side, you will learn how to detect different types of attack techniques and conduct live forensics activities as a part of incident response.

Success and recognition

At Defensive Security, I take pride in my hard work and dedication to becoming one of the most respected and successful small cybersecurity companies in Poland. I continue to work hard, developing new and advanced security research in the scope of offensive and defensive Linux areas.

Collaboration

As a business owner, you have to understand the critical importance of protecting your digital assets from the ever-present Linux threats. That is why I encourage you to consider working with me at Defensive Security to ensure that your company is protected by the very best skilled and experienced cybersecurity experts who know how to protect and attack Linux boxes, including Kubernetes clusters and Linux in clouds.

Summary

I invite you to contact me today to learn more about Defensive Security services and training programs. I promise to provide you with an exceptional and unique learning experience that will completely change your view of Linux security and Open Source Security / Attack / Detection / Hunting / DFIR. 

Join now, increase your knowledge, and take the first step toward a successful career in Linux-oriented cybersecurity.

Leszek Miś - 14/03/2023