1. Mysterious Files

Mysterious Files

Concealing information via embedded files.

Execution

1. Execute flag.py. It asks for a flag.
2. Search for the flag inside info.png using either of the following tools:
   • Binwalk:

     # Look at what files are contained within
     binwalk info.png
     
     # The ZIP file looks interesting
     binwalk -e info.png
     cd _info.png.extracted
     
     # Unzip it
     unzip 134EF.zip -d folder
     cd folder
     
     # Look at house.txt
     cat house.txt
     
     # Looks like Base64
     base64 -d house.txt
     
     # Possible PNG
     base64 -d house.txt >house.png
     
     # Nice image, but there is a flag
     strings house.png | grep flag

   • Foremost:

     # Look at what files are contained within
     foremost info.png
     cd output
     
     # The ZIP file looks interesting
     cd zip
     
     # Unzip it
     unzip 00000154.zip -d folder
     cd folder
     
     # Look at house.txt
     cat house.txt
     
     # Looks like Base64
     base64 -d house.txt
     
     # Possible PNG
     base64 -d house.txt >house.png
     
     # Nice image, but there is a flag
     strings house.png | grep flag

   • CyberChef:
     1. Insert info.png inside the input.
     2. Look for embedded files.
     3. Get the ZIP file out.
     4. Extract it and grab the text file as input.
     5. Decode the Base64. Looks like a PNG.
     6. Look for strings. More specifically, the flag.
3. Enter the flag.

Made with ❤ by Param.