2. Disini saya menggunakan iLSpy untuk decompile program, berikut hasil decompile program menggunakan iLSpy
using System;
using System.ComponentModel;
using System.Drawing;
using System.Security.Cryptography;
using System.Text;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public class Form1 : Form
{
private IContainer components = null;
private Button button1;
private TextBox textBox1;
private string Oye = "abcdefghijklmnopqrstuvwxyz0123456789";
protected override void Dispose(bool disposing)
{
if (disposing && this.components != null)
{
this.components.Dispose();
}
base.Dispose(disposing);
}
private void InitializeComponent()
{
this.button1 = new Button();
this.textBox1 = new TextBox();
base.SuspendLayout();
this.button1.Location = new Point(110, 96);
this.button1.Name = "button1";
this.button1.Size = new Size(75, 47);
this.button1.TabIndex = 0;
this.button1.Text = "Check Beibe";
this.button1.UseVisualStyleBackColor = true;
this.button1.Click += new EventHandler(this.button1_Click);
this.textBox1.Location = new Point(80, 40);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new Size(157, 20);
this.textBox1.TabIndex = 1;
base.AutoScaleDimensions = new SizeF(6f, 13f);
base.AutoScaleMode = AutoScaleMode.Font;
base.ClientSize = new Size(320, 174);
base.Controls.Add(this.textBox1);
base.Controls.Add(this.button1);
base.Name = "Form1";
this.Text = "IDSECCONF 2014 - EASY REVERSE";
base.ResumeLayout(false);
base.PerformLayout();
}
public Form1()
{
this.InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
string text = this.Oye.Substring(6, 1); // g
text += this.Oye.Substring(0, 1); // ga
text += this.Oye.Substring(13, 1); // gan
text += this.Oye.Substring(19, 1); // gant
text += this.Oye.Substring(4, 1); // gante
text += text.Substring(2, 1); // ganten
text += text.Substring(0, 1); // ganteng
text += this.Oye.Substring(26, 5); // ganteng01234
text = text.Remove(10, 1); // ganteng0124
text = text.Replace(text.Substring(9, 1), text.Substring(7, 1)); // ganteng0104
text = text.Replace(text.Substring(7, 1), this.Oye.Substring(28, 1)); // ganteng2104
text = text.Replace(text.Substring(8, 2), this.Oye.Substring(26, 2)); // ganteng2014
MD5 mD = MD5.Create();
byte[] array = mD.ComputeHash(Encoding.UTF8.GetBytes(text));
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < array.Length; i++)
{
stringBuilder.Append(array[i].ToString("x2"));
}
if (this.textBox1.Text == text) // ganteng2014
{
MessageBox.Show(stringBuilder.ToString(), "Flag"); // cetak flag
}
else
{
MessageBox.Show("Dikocok lagi bro");
}
}
}
}
3. Perhatikan kode diatas yang saya tebalkan, password nya adalah ganteng2014
FLAG : 9bd03cfdfe10124755e2a051288c6dda
