Challenge details. Category Points Solves Forensics 330 11 1. Challenge description One of my friends is a show-off and I don’t like that.Help me find the backdoor he just boasted about! :DYou’ll find an image of his USB key here.And one last thing, my friend owns you-shall-not-pass.ctf.insecurity-insa.fr. 2. Solution 2.1 Data Extraction Part By extracting the compressed file that was given to us, we find a raw image of an NTFS filesystem, you can verify that using the file command on linux.