After a few months without using radare2 it’s now time to get back to the write ups. During this time, and as you can see in my previous posts, I’ve been acquiring knowledge in other IT Security areas. I’ll now return with Protostar challenges and Radare2, starting with stack0. Looking…
Today, I bring to you another binary bomb that I found in 0x00sec website. This bomb has 4 stages, each one corresponding to a color. Let’s now defuse it, phase by phase. First, let’s take a look at the main menu of this Dr Von Noizeman’s nuclear bomb. Yellow Phase…
The exercise of this week is a bomb! A binary one, of course. The bomblab is an exercise from the UCR that I found here. I ended up finding more bombs like this one in other sites and, for me, this exercise is more challenging that the previous crackme‘s. So,…
If you are an active reader of this blog (if you aren’t, why not start now?), then you probably know that I’ve been solving exercises from IOLI-Crackme aiming to learn about Radare2 and to take the first steps in the Reverse Engineering field, but you can read the full motivation…
The IOLI-Crackme’s exercises have come to an end. Crackme0x09 is the last exercise of this series. Let’s start analyzing the Assembly to see what changed since the last exercise. Getting the Crackme0x09 password through analysis When we check the available functions, we’re able to notice that the names have…
It’s not something new that both password and the environment variable are the same for the last exercises. But the fact that the code itself is almost the same… Well, that’s boring! Anyway, let’s analyze crackme0x08 and see what it reserved for us. Getting the Crackme0x08 password through analysis Contrary…
Crackme0x07 is the exercise of this week. New tricks are used to make our task more difficult. This tricks includes function names identical to native functions. Let’s see. Getting the Crackme0x07 password through analysis Those functions in purple are the ones that need our attention. Let’s now “divide and conquer”……
Crackme0x06! A new exercise, a new function. Also, some new tricks are used to obtain the so wanted “Password OK”. This exercise is very alike the previous one, so I won’t go through the functions already explained. Getting the Crackme0x06 password through analysis As usual, let’s check the functions…
When I started writing this posts about radare2, I was expecting to learn how to work with this tool. That was the objective and what drove me to start this blog. What I was not expecting, was to learn something about Assembly. Crackme0x05 is the first from this series of…
All the exercises solved so far, had one thing in common: there was only one solution for the problem. Crackme0x04 does not inherit that characteristic because it has multiple solutions and has some tricks to calculate those solutions when compared to the previous crackme. Getting the Crackme0x04 password through…