Recent posts

Pwnable.kr - random

This challenge focuses on pseudo-random number generators, the randomness of the generated numbers depends on the `se...

less than 1 minute read

Pwnable.kr - passcode

This challenge was a bit frustrating at first so let's go easy. First there is a call to `welcome()` which takes 100 ...

5 minute read

Pwnable.kr - flag

This challenge is just a simple reverse engineering task, from the challenge description we can guess that the binary...

less than 1 minute read

Pwnable.kr - bof

This is a classic buffer overflow challenge, the code reads user input and stores it in a 32 bytes array using `gets(...

1 minute read

Pwnable.kr - collision

This challenge takes a 20 bytes passcode as input then checks it against some hashcode, if it's the same we get the f...

1 minute read

Pwnable.kr - fd

This challenge takes one command line argument, converts the argument to an integer and subtracts 0x1234 from it. Th...

1 minute read

UTCTF 2020 - IR

This challenge takes one command line argument, converts the argument to an integer and subtracts 0x1234 from it. Th...

9 minute read

Deep Analysis of Phobos Ransomware

First I loaded the binary into pestudio We can see some interesting imports with different functionalities like: file...

7 minute read