Summary: This post details my personal journey of passing the practical HTB Certified Defensive Security Analyst (CDSA) exam. It covers my preparation strategy, a breakdown of the 7-day exam experience, and essential tips for anyone aspiring to earn this blue team certification.

Certification at a Glance

Hello everyone, and welcome to my first-ever blog post! The feeling is incredible, not just because I’m launching this blog, but because I have some exciting news to share – I have officially passed the Hack The Box Certified Defensive Security Analyst (HTB CDSA) exam!

The journey was challenging but immensely rewarding. Through this article, I want to share my entire experience, from the moment I decided to pursue it, through the preparation, and all the way to the exam itself. I hope my story will be helpful to all of you who are considering the same path.

Overview of the HTB CDSA

The HTB CDSA is not your typical multiple-choice certification. It is a completely practical, hands-on exam that places you in the role of a Security Analyst in a realistic scenario. Its goal is to test your skills in security analysis, Security Operations Center (SOC) procedures, and Incident Response.

This certification is designed for those who want to validate their Blue Team skills. If you are interested in roles like SOC Analyst, Incident Responder, Threat Hunter, or Digital Forensics Analyst, then this is the right choice for you. It confirms that you possess intermediate-level technical competence and are capable not only of finding traces of an attack but also of writing a professional report about it.

Domains & Pricing

The HTB CDSA teaches and tests you in the following domains:

• SIEM Operations (Splunk and the ELK Stack)
• Log Analysis from various sources
• Threat Hunting (proactively searching for threats)
• Network Traffic Analysis (Wireshark, Suricata/Zeek)
• Basic Malware Analysis
• Digital Forensics and Incident Response (DFIR)
• Professional Incident Report Writing

Regarding the price, there are two components: the training and the exam itself.

1. Training (HTB Academy): To be eligible for the exam, you must complete the entire “SOC Analyst” job-role path on the Hack The Box Academy. The most cost-effective option is the Silver Annual subscription, which costs $490 per year. This plan grants you access to all the necessary modules and includes one exam voucher (for the CDSA, CPTS, or CBBH).
2. Exam (Voucher): If you purchase the exam voucher separately, its price is $210.

So, for the complete package (training + exam), the most common investment is $490 (Before new VIP update).

My Preparation Strategy

Preparation is the key to everything, and there are no shortcuts. The only real path is to complete the entire “SOC Analyst” job-role path on HTB Academy. This path consists of 28 modules (this number may change) that cover everything from the fundamentals to advanced techniques. It’s worth noting that I was juggling my high school classes at the same time, so my preparation process naturally took more time to ensure I could thoroughly absorb all the material.

My approach to preparation was as follows:

• Focused Module Completion: I didn’t just read and click “next.” I carefully studied each module and did the hands-on exercises multiple times until I was certain I fully understood the concepts.
• Note-Taking: This is absolutely crucial. I used Obsidian for my notes. For every tool and technique, I wrote down key commands, SIEM queries, and processes. I created my own personal cheat sheet that proved invaluable during the exam.
• Understanding the “Why”: It’s not enough to just know a command. I made an effort to understand why I was using a specific Splunk query or why I was looking at a particular log file. Understanding the attacker’s perspective greatly helps in defense.
• Extra Practice: Although the Academy is sufficient, If you don’t have experience you should do some HTB boxes before attepmting certification.

The 7-Day Exam Experience

The exam itself lasts for 7 days. When you begin, you are given VPN access and a “Letter of Engagement” that explains your task. You are placed in an environment with multiple machines, and your task is to investigate two separate security incidents. During your investigation, you will find evidence, analyze logs, network traffic, memory dumps, and files.

The key to passing isn’t just the technical analysis. To pass, you must write and submit a professional, detailed incident report. This report must contain all your findings, evidence (screenshots), the attack timeline, the tools and SIEM queries you used, and recommendations for remediation. The report carries a massive portion of the final grade.

My 7-day exam felt like a real job as a SOC Analyst. Here’s a breakdown of how it went for me:

On the very first day, I managed to solve 16 out of 20 flags for the first incident. By the second day, I had already met the minimum passing requirement and started writing the report for Incident 1. On the third day, I began working on Incident 2, which was more difficult. After spending two days on that incident, I started writing the report for it.

The final day was dedicated solely to finishing and polishing the report. Throughout the entire process, I took meticulous notes and screenshots. I spent about 5 hours of real, productive work each day. Thanks to my previous experience, I didn’t find the certification overly difficult, but my thorough preparation on the HTB Academy was also a major contributing factor to that.

Key Tips for Success

If you are planning to take the HTB CDSA, here are a few tips from my firsthand experience:

1. Trust the Academy Process: Everything you need for the exam is genuinely in the modules. Study them in detail.
2. Notes, Notes, and More Notes: I cannot stress this enough. Organize them by tools and techniques.
3. Practice Report Writing: Before the exam, read several publicly available DFIR reports (e.g., from The DFIR Report). Practice writing based on a scenario. Use a tool like SysReptor, which HTB recommends.
4. Manage Your Time: You have 7 days. Make a plan. You don’t need to be at it 24/7. Rest is important to stay fresh and focused.
5. Take Lots of Screenshots: Document every step, every command, and every significant result with a screenshot. You will thank yourself later when you’re writing the report.
6. Don’t Panic: If you get stuck, take a break. Go for a walk. The solution is often obvious, but you can’t see it when you’re fatigued.

I hope this detailed breakdown was useful. The HTB CDSA is more than just a certification—it’s a fantastic learning experience that truly prepares you for real-world cybersecurity challenges.

If you have any questions, feel free to contact me!