Posts

Hello, In this post I’m going to show you how quickly you can add a dark theme switch to your Vue.JS application. We’re going to start with a blank application. And then we’re going to create a dark-theme CSS file which we’re going to save in public/css/darktheme.css. This is how the application looks without any CSS. Now, we’re going to put the following code in darktheme.css: body { background-color: #2c3e50; } h1,h2,h3,h4,h5,h6,p { color: #42b983; } We can test our theme by appending the following line in the of public/index....

I haven’t done any embedded development in a while and I was thinking to build myself a remote controlled toy car with video streaming. The project is going to take me a while. To build it I’m going to use C#. I’m already too familiar with Python and a little challenge doesn’t hurt. To interface with the hardware, I’m going to use the .Net Core IoT Libraries from Microsoft....

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. After reading through the GameBoy CPU manual, I’ve opened the file in Ghidra and found these interesting strings:...

I had some fun this weekend messing around with Ghidra. Having such a powerful tool for free is truly a game changer. To start scripting in Ghidra, I downloaded the latest Eclipse for Java Developers Version: 2019-09 R (4.13.0), Ghidra and Open JDK, I believe any JDK version 11+ will work. After downloading the JDK, extract the zip, put it somewhere and modify your PATH and JAVA_HOME environment variables to point to it:...

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. Here’s how I approached the challenge: Since the binary had a few function and some strings were in plain text, I tried to figure out the big picture and labeled all the function accordingly: win, lose, check and so on....

Hello, In this article I’ll present you my solution on the Chapter 5 CTF from the book Practical Binary Analysis. For this binary, the hint is to fix four broken things. Running file gives us the following response: binary@binary-VirtualBox:~/ctf$ file ./lvl3 ./lvl3: ERROR: ELF 64-bit LSB executable, Motorola Coldfire, version 1 (Novell Modesto) error reading (Invalid argument) And the readelf command gives us: binary@binary-VirtualBox:~/ctf$ readelf -h ./lvl3 ELF Header: Magic: 7f 45 4c 46 02 01 01 0b 00 00 00 00 00 00 00 00 Class: ELF64 Data: 2's complement, little endian Version: 1 (current) OS/ABI: Novell - Modesto ABI Version: 0 Type: EXEC (Executable file) Machine: Motorola Coldfire Version: 0x1 Entry point address: 0x4005d0 Start of program headers: 4022250974 (bytes into file) Start of section headers: 4480 (bytes into file) Flags: 0x0 Size of this header: 64 (bytes) Size of program headers: 56 (bytes) Number of program headers: 9 Size of section headers: 64 (bytes) Number of section headers: 29 Section header string table index: 28 readelf: Error: Reading 0x1f8 bytes extends past end of file for program headers At this moment, it was clear that the ELF header is broken, in order to fix it I opened up Wikipedia and the elf specification....

Image by Steve Buissinne from Pixabay Hello, I don’t think I’d like to invest time and resources in this project anymore, I had fun programming it and learning about different aspects of game development and the Unity game engine. Making games involves a lot of hard work and I initially started this in order to escape from my ordinary programming activities, to do something different. Next, I think I’m going to shift my focus to some areas that will benefit the development of my career, like, trying to learn more about computer security and getting better at solving problems....

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....

Hello! My daily work is doing full stack web development, and reversing is a side thing that I do for fun and in my free time. In this article I will show you an easy way to solve for ELF C++ – 0 protection challenge, which can be found on https://www.root-me.org under the cracking section. I found this challenge a bit difficult mostly because I’m not used to reverse C++ code but, since it doesn’t contain any protection at all, all you need to do is to inspect the parameters....

Hello everyone! Here’s what we did for our 4th devlog: We’ve added a game menu to the game it is interactive and it’s working without any code at all. Thanks to Brackeys for making awesome tutorials, here’s the one we used for the menu: https://www.youtube.com/watch?v=zc8ac_qUXQY After creating the main menu, we wanted to juice up the game a little and we’ve researched a ways to shake the camera when a bomb explodes....