This script tries to read a .bin file created by the Android
application "Vault" and tries to extract a video from it.
Vault, while looking like a secure data storage application, is totally not secure at all. It does not encrypt files in the traditional sense, but just runs the file's first 128 bytes into an exclusive OR with a specific byte value used as key.
We cannot be sure what that byte value key is, but if we were to
assume that the .bin file contains a video, and assuming
that video is in an MP4 container, then the first 4 bytes of the file
should be ftyp. We can determine the byte value used as key
by finding out what value can be XOR-ed with ftyp to get the
value stored in the input file.
Fortunately, XOR is a reversible operation, meaning,
A XOR B is equal to C;
and
C XOR B is equal to A;
So we just do
(first byte of the file) XOR (the ASCII value of 'f') = the key
Now that we have a clue at the possible key, we can just try XOR-ing the first 128 bytes of the file before copying to the output and then for the remaining bytes of the input file, just copy them as is to the output.
Just run the script through Python3 and it should give you instructions.
| Operating System | Running instructions |
|---|---|
| Windows | Install Python3 then double click the .py file. Then, type the path to the input file (relative or absolute) or drag-and-drop the input file to the terminal window then press ENTER. |
| Linux | Install Python3 (for example, pacman -S python) and then run the script (for example, chmod +x sadecode.py && ./sadecode.py). Type the path to the input file (relative or absolute) or drag-and-drop the input file to the terminal window then press ENTER. |
| macOS | Install Python3 (for example, via Brew) and then run the script (for example, python3 sadecode.py). Type the path to the input file (relative or absolute) or drag-and-drop the input file to the terminal window then press ENTER. |
This is licensed with GPL-3. Please check the LICENSE file for more details.
Copyright (c) 2019-present Kyle Alexander Buan