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CyberTank_Window_Controller.md

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CyberTank Window Controller

Reversing

Password (100 points)

CyberTank has such secure car windows that they require a password! Can you find out what the password is?

Flag format: CTF{xx_xx_xx}

An executable was attached.

user@CTF_PC:/mnt/e/CTFs/hackazon$ file CyberTankWindowApp.exe
CyberTankWindowApp.exe: PE32 executable (GUI) Intel 80386 Mono/.Net assembly, for MS Windows

When we run it, we get a simple application which controls the CyberTank windows:

We need to provide the password.

Since this is a .NET application, we can try to decompile it with ILSpy.

Under CyberTankWindowApp (1.0.0.0) -> CyberTankWindowApp -> App we find a method called CheckPassword:

// CyberTankWindowApp.App
using System.Windows.Forms;

private bool CheckPassword()
{
	if (textBox1.Text != "CTF{" + pt2 + "_" + pt1 + "_" + pt3 + "}")
	{
		MessageBox.Show("Wrong password :(", "CyberTank Window Controller", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
		return false;
	}
	return true;
}

We follow pt2, pt1 and pt3 to get:

private string pt2 = "window";
private string pt1 = "reverse";
private string pt3 = "control";

The flag therefore is: CTF{window_reverse_control}.