Description:

EN: All Experts of The Silver Shield Project can’t decipher the intercepted data. Who knows, maybe you can do it?
100_00edb54bed7e46bd5cdb7c06059881c2

 

In this PPC 250 pts challenge we got only one file. Let’s run File command on it to determine it’s type.

Megabeets:/tmp/h4ckit/paraguay# file 100_00edb54bed7e46bd5cdb7c06059881c2
100_00edb54bed7e46bd5cdb7c06059881c2: Zip archive data, at least v2.0 to extract

 

This is a zip file which contains another folder within. The folder contains a file named ‘99‘. Let’s extract it and figure out it’s type:

Megabeets:/tmp/h4ckit/paraguay# file 99
99: Zip archive data, at least v1.0 to extract

99 is also a zip file, and inside it has another zip, and another zip… well, I see where it going to. I wrote a simple Powershell script to extract all the archives using the ultimate archive manipulator – 7-zip.

# Set $path to a folder only with the file '99'
# 99 Exists in 'work_folder' inside the first archive

$path = "C:\\your\\\path"

while($true)
{
    $file = (gci $path)[0]
    &'C:\Program Files\7-Zip\7z.exe' e $file.Fullname -y > $null
    if($file.Name -eq 'flag')
    {
        # print the content of the file
        gc $file
        break;

    }
    else
    {
        Remove-Item $file.Fullname
    }
}

Now let’s run it:

PS C:\h4ckit\paraguay> C:\h4ckit\paraguay\solve.ps1
FLAG: 0W_MY_G0D_Y0U_M4D3_1T