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Hey everyone. May have a nice day! So today I’m gonna explain how a help (.chm) file could be a malicious file in Windows machine. First, we need to clarify what is .chm file and what its function. Based on this website, CHM is an extension for the Compiled HTML file format, most commonly used by Microsoft’s HTML-based help program. It may co...

Welcome back guys. Today I’m gonna do reverse engineering and steganograpy challenges from FSecure2019. Qualification Challenge 1 Investigate the image and then decode the flag. Let’s dive in into the image. Okay first question. We need to decode this image and get “something” from it. Try to extract information using tools like binwalk,...

Below are the few reverse engineering category’s challenges that I’ve been solved. It was a pretty easy challenge to solve. revfun Step 1: Run file command on the binary. Now we know that it’s a ELF 64 bit file. Step 2: Use strings command to display all the strings on the binary and we can see there is a suspicious string “dlr0w_s1h7_s1_...

This write-up are focus on reverse engineering and pwn category for i-Hack 2018 Qualification. Reverse Engineering - Password, Please First, run file command on the binary to check what type of data is it. So based on the output above, it is an ELF 32bit file. So, let’s run it on our terminal. The program ask us for the password and we tes...

Hye, Assalamualaikum. First of all, this is the first version of CipherText CTF. It’s a first Online Cyber Security competition for all Arab talents in security field. Imran (My teammate) and I playing this game only for fun and of course, to improve our knowledge and skills in this type of security challenge. From 319 teams, we (Ultraman) manag...