Reverse Engineering

Hello, here’s my take on the picoCTF2019 reverse engineering asm challenges. If you don’t know assembly, please watch a few tutorials on it:

I’m always late to the party but here’s my solutions to the PicoCTF2019 Vault Doors challenges from the reverse engineering section. I did it this mainly to improve my skills and hopefully to learn some new things.

Hello, Here’s a quick article on how to bypass calls to ptrace when debugging a Linux executable. By calling ptrace with the PTRACE_TRACEME option, a process can detect if it’s being debugged and execute different instructions. This an effective anti-debugging technique.

Hello, In this article I will describe how I solved the GB – Basic GameBoy crackme challenge from Root-Me. Before reading this article you should attempt to solve the challenge on your own. Start by reading/skimming through the GameBoy CPU manual then download an emulator such as mGba and play with the ROM. To disassemble the ROM I’ve used Ghidra and mgbdis.

I had some fun this weekend messing around with Ghidra. Having such a powerful tool for free is truly a game changer.

Hello, In this article I will describe how I solved the PE x86 – Xor Madness challenge from Root-Me This challenge will ask you for a password and the password is also used to validate the flag. What makes this challenge interesting is that it only uses xor, sub, call and ret.

Hello, In this article I’ll present you my solution on the Chapter 5 CTF from the book Practical Binary Analysis.

I always wanted to play around with a binary analysis framework but most of the time I was turned off by how difficult it was to install and use it. Just recently I’ve thought to give angr a try and now I want to share my experience with you! I will present you a two scripts that solve two challenges, if you wish to dig deeper and learn Angr then you should visit it’s official documentation.

It’s been some time since I’ve done some Reverse Engineering and today I’ve completed a simple challenge on . The filename of the challenge is crackme_wtf and here are some hints to get you started:

Hello, In this article I present you the solution to nice and short cracking challenge from Root-Me. After opening it up in Ghidra, I saw that the challenge is easy to solve, all you need is to find the password, which is in plain text. Basically just copy paste and you get the flag, but wait, there’s a twist!