Challenge Information
- Advent of Cyber Day 5
- THM link here
Explanation
Today’s task is just basically changing the magic bytes in Windows by using MS-DOS. The first thing is to read the README.TXT as it contains useful information
By reading it, we need to change the file signature to 41 43 which is A C after converting to ASCII. The next step is just changing back with EDIT command.
After confirmed that the first 2 bytes has changed accordingly, Just use their own program to get the flag.
Things I learned from the challenge
- Understanding how magic bytes works and how to edit