security :Howto Crack “Password Protection” / “Recover” the Excel

In order to perform the crack / recovery, we are going to use a small utility called xlcrack, xlcrack recovers lost or forgotten passwords from XLS files such as those created by Microsoft Excel. Some newer XLS files are not suitable for password recovery using this software.

Install libgsf-1

kartook@Nilas:~$sudo apt-get install libgsf-1-dev

Download and compile xlcrack

kartook@Nilas:~$tar zxvf xlcrack-1.2.tar.gz
kartook@Nilas:~$cd xlcrack-1.2

How to Crack / Recover A Password From a XLS-file

kartook@Nilas:~$./xlcrack password_protected_spreadsheet.xls
password_protected_spreadsheet.xls: 1234

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