About
Hey, I’m ZennisKayy 👋
Final-year Information Security student at HCMC University of Science (HCMUS). I spend most of my time breaking things apart to understand how they work — binaries, protocols, cryptosystems, you name it.
This blog is where I document what I learn, explore what interests me, and occasionally rant about that one challenge that kept me up until 12 AM.
🧠 What I’m Into
My main interests orbit around the lower layers of computing — the stuff that most people would rather not think about:
- Reverse Engineering — Stripping binaries down to their logic. Whether it’s a crackme, a packed executable, or a malware sample, I enjoy the process of reconstructing intent from assembly.
- Cryptography — From classical ciphers to modern constructions. I find broken crypto implementations in CTFs particularly satisfying to exploit.
- Pwn / Binary Exploitation — Stack and heap exploitation, format strings, ROP chains. Still learning, but getting there.
- Malware Analysis — Currently diving deeper into this space. Static and dynamic analysis, understanding APT tooling, and figuring out what malware is actually doing under the hood.
- CTF Competitions — Where most of the above gets put to the test under time pressure.
🛠️ Tools & Skills
| Category | Tools / Skills |
|---|---|
| Disassembly / Decompilation | IDA Pro, Ghidra, Binary Ninja |
| Dynamic Analysis | x64dbg, WinDbg, Frida |
| Malware Analysis | FLARE-VM, Cutter, PEiD, pestudio |
| Scripting | Python, IDAPython, Ghidra Script |
| Exploitation | pwndbg, pwntools, GDB |
| Cryptography | SageMath, CyberChef, custom scripts |
| DFIR / Detection | YARA, Wireshark, Sysinternals Suite |
🚩 CTF
I play CTF with N3tw0rkGhosts — primarily focusing on Reverse Engineering, Crypto, and Pwn categories.
CTF is where theory meets practice. It’s frustrating, humbling, and occasionally euphoric — I wouldn’t trade it for anything.
📝 About This Blog
This isn’t a tutorial site or a polished knowledge base. It’s a personal learning log — written the way I think, with the detail level I wish I had when I was first learning.
Posts here typically cover:
- Malware analysis write-ups and technique breakdowns
- CTF challenge solutions (rev, crypto, pwn)
- Tool development (scripts, automation, IDA/Ghidra plugins)
- Deep-dives into techniques I find interesting enough to document properly
If something here helped you, that’s great. If you spot something wrong, feel free to reach out — I’d rather be corrected than confidently wrong.
📬 Contact
- GitHub: zenniskayy2k4
- CTFtime: N3tw0rkGhosts
“The best way to understand something is to take it apart.”