https://blog.ruifi47.com/Technical blog focused on information security and ethical hacking content. 2026-04-19T18:40:38+01:00 ruifi47 https://blog.ruifi47.com/ Jekyll © 2026 ruifi47 /assets/img/favicons/favicon.ico /assets/img/favicons/favicon-96x96.png 2024-09-28T01:00:00+01:00 2024-09-28T01:00:00+01:00 https://blog.ruifi47.com/posts/h7ctf2024/ ruifi47

Introduction Recently, I participated in the H7CTF International with ransoware, placing 14th out of 527 teams. Here are the writeups for some of the challenges that I solved during the CTF. Web No Paste Description “If you spend too much time thinking about a thing, you’ll never get it done. Paste it up, cut it out, and just do it” — Unknown In this challenge, we have a webpage with a...

2023-03-07T00:00:00+00:00 2024-10-16T23:46:46+01:00 https://blog.ruifi47.com/posts/kalmarctf2023_tinyshell/ ruifi47

Introduction This writeup presents the intended solution for lleHSniT!, one of the forensics challenges of Kalmar CTF 2023. Challenge Description One of our users here at StupidCorp ran a malicious binary they were sent over an email. We made a process dump, and dumped the network logs. We think it is TinySHell, can you please help figuring out what happened? Writeup To solve this challen...

2022-06-25T01:00:00+01:00 2024-05-15T17:51:01+01:00 https://blog.ruifi47.com/posts/typhoonconctf2022_hidden_character/ ruifi47

Challenge Description It takes one character [ ] to show you the path to salvation. And it takes a hidden character to lead you to the flag Let’s start by accessing the challenge web application through the URL that was given to us. We are presented with the following login form: Login form The browser extension Wappalyzer gives us information about the technology stack of the website....

2022-05-22T01:00:00+01:00 2024-10-16T23:46:46+01:00 https://blog.ruifi47.com/posts/htbcactf2022/ ruifi47

Forensics Puppeteer Challenge Info Planet Longhir is known for it’s top-tier researchers. Due to their dedication in science and engineering, their military equipment is the most advanced one in the galaxy. In fact, the prototype DES-3000, a self-propelled precision-strike missile that is capable of reaching targets even in Ratnik galaxy, is being used to disable Galactic Federation’s com...