Difficulty : 5 (?)
Language : C# (.NET)
Platform : Windows
OS Version : Windows 7+
Packer / Protector : EazFuscator v2018.1

Description :

When pressing the "go" button some unknown function takes text from the input box and converts it to something to put in the output box.

Your goal is to unpack the program and provide me with the source code to that function.

Screenshot :

unpack-me.exe

    private void btnGo_Click(object sender, EventArgs e)
    {
        this.txtOutput.Text = main.smethod_0(this.txtInput.Text);
    }
    private static string smethod_0(string string_0)
    {
        byte[] bytes = Encoding.UTF8.GetBytes("5myd2VTtPqB7dJ0i");
        byte[] bytes2 = Encoding.UTF8.GetBytes(string_0);
        byte[] bytes3 = new PasswordDeriveBytes("uh oh... looks like i've been unpacked", null).GetBytes(32);
        ICryptoTransform transform = new RijndaelManaged
        {
            Mode = CipherMode.CBC
        }.CreateEncryptor(bytes3, bytes);
        MemoryStream memoryStream = new MemoryStream();
        CryptoStream cryptoStream = new CryptoStream(memoryStream, transform, CryptoStreamMode.Write);
        cryptoStream.Write(bytes2, 0, bytes2.Length);
        cryptoStream.FlushFinalBlock();
        byte[] inArray = memoryStream.ToArray();
        memoryStream.Close();
        cryptoStream.Close();
        return new string(Convert.ToBase64String(inArray).ToArray<char>().Reverse<char>().ToArray<char>()).Replace("=", string.Empty);
    }

unpack-me_.exe

done-un.rar

Hi @JustinOOO

Can you post another one but this Time also with Native Code VM for protecting that specific function?!

On 4/27/2018 at 5:30 PM, demon_da said:

Hi @JustinOOO

Can you post another one but this Time also with Native Code VM for protecting that specific function?!

This one is protected with VM Already.