Now, under 'run' you can also find a python script, office2john.py: you can use it for extract the hash from the encrypted XLSX file: If everything goes well, the executables for John and its related utilities will be created under './run/'. The correct way is to extract the password hash from the file and then cracking it using John The Ripper.įor this purpose, you need to get a ' jumbo' build of John The Ripper, that supports Office files cracking. As it is encrypted nothing could be tweaked by opening the document with a hex editor. The encryption algorithm of encrypted Microsoft Excel files is 40bit RC4. I did it,and now i'd like to share workflow for XLSX cracking. Obviously, the file was password protected, and I had to find a way to read it.
Recently, during a forensic analysis on a laptop of an employee charged with corporate espionage, I've carved from disk a suspicious Excel file.
