Fairly straightforward reversing challenge with a malware / ransomware flavor. The challenge text reads:

I didn’t plan to play this CTF but when I saw this challenge I was a bit hooked. So I ended up competing in it.

Long time since my last CTF writeup. I thought I would post this one since it was the first CTF I had done in a while and I wouldn’t mind getting back into them. I spent a few hours on this CTF and solved a couple of challenges. The first one had the following clue:

First part of a long series of well thought out challenges in the RHme2 CTF. This one was the “introduction” one but it was tricky and certainly worth the 400 points I feel. Here’s my approach which I believe is different to how some others solved it. First, the clue:

Riscure RHme2 is finally over! What a marathon CTF. I actually spent a tonne of time on this CTF over the past few months, mainly because I had never looked at embedded hardware systems in the past. So I had to gain my skills from never having even used Arduino to performing side channel analysis and fault injection, reverse engineering 8 bit microcontroller binaries, and dealing with ever increasing lust for more and better hardware hacking tools!