[crackme] # New Crackme .NET #

August 6, 2013

Hi Everyone..

Here a new crackme + Simple coded in .net

Goal: Get the correct serial for your username

Download: http://www.sendspace.com/file/ku1aq3

Rar Pass: crackme

That is all

Greets

Edited August 6, 2013 by RDGMax

August 6, 2013

Xenocode

6C756A2F697151776E477058393452736A67467248673D3D

Was quit easy, and it's called a "keygenme", but correct me if I'm wrong

n.b; are you the real Tejon owner ?

Edited August 6, 2013 by Xenocode

August 6, 2013

Was quit easy, and it's called a "keygenme", but correct me if I'm wrong

n.b; are you the real Tejon owner ?

Excellent..Tomorrow..level 2 OK

Correct if you get the serial is a semi keygen me.. if you patch it's a.. crackme

Edited August 6, 2013 by RDGMax

August 7, 2013

Name: atom0s

Serial: 34473469305034716F35343D

August 7, 2013

Ready for Level 2?

August 7, 2013

RDG Simple Crackme Level 2

Download: http://www.sendspace.com/file/fbntb7

Rar Pass: crackme

August 7, 2013

Keygen + src for Level 1:

 

/**

 * atom0s!keygen.exe (c) 2013 [atom0s@live.com]

 * 

 * Keygen for RDGMax CrackMe found here:

 * http://forum.tuts4you.com/topic/32850-new-crackme-net/

 */

 

namespace atom0s_keygen

{

    using System;

    using System.IO;

    using System.Security.Cryptography;

    using System.Text;

    using System.Windows.Forms;

 

    public partial class frmMain : Form

    {

 

        /// <summary>

        /// Default Constructor

        /// </summary>

        public frmMain()

        {

            InitializeComponent();

        }

 

        /// <summary>

        /// Text input change event handler.

        /// </summary>

        /// <param name="sender"></param>

        /// <param name="e"></param>

        private void txtUsername_TextChanged(object sender, EventArgs e)

        {

            if (this.txtUsername.Text.Length < 6)

            {

                this.txtSerial.Text = "Invalid Username Length! (6+ chars needed!)";

                return;

            }

 

            var serial = this.StringToHex(this.EncryptString(this.txtUsername.Text));

            this.txtSerial.Text = string.IsNullOrEmpty(serial) ? "Invalid username input; cannot create serial!" : serial;

        }

 

        /// <summary>

        /// Converts the input string to a hex string.

        /// </summary>

        /// <param name="strInput"></param>

        /// <returns></returns>

        private string StringToHex(string strInput)

        {

            var str = string.Empty;

            for (var x = 1; x <= strInput.Length; x += 1)

            {

                var exp = String.Format("{0:X}", (int)strInput[x - 1]);

                if (exp.Length == 1) exp = "0" + exp;

                str += exp;

            }

            return str;

        }

 

        /// <summary>

        /// Encrypts the input string with DES encryption.

        /// </summary>

        /// <param name="strInput"></param>

        /// <returns></returns>

        private string EncryptString(string strInput)

        {

            if (string.IsNullOrEmpty(strInput))

                return string.Empty;

 

            var key = new byte[] { 0xD4, 0xED, 0x34, 0x93, 0x1C, 0x48, 0xAC, 0x08 };

            var vec = new byte[] { 0x12, 0x44, 0x16, 0xEE, 0x88, 0x15, 0xDD, 0x41 };

            

            var desProvider = new DESCryptoServiceProvider();

            var stream = new MemoryStream();

            var str = string.Empty;

 

            try

            {

                // Convert the input to bytes..

                var data = Encoding.UTF8.GetBytes(strInput);

 

                // Encrypt the data with DES..

                var encStream = new CryptoStream(stream, desProvider.CreateEncryptor(key, vec), CryptoStreamMode.Write);

                encStream.Write(data, 0, data.Length);

                encStream.Flush();

                encStream.Close();

 

                // Encode the return in base64 format..

                str = Convert.ToBase64String(stream.ToArray());

            }

            catch

            {

            }

            finally

            {

                stream.Close();

            }

 

            return str;

        }

    }

}

atom0s!keygen.zip

August 7, 2013

Keygen + src for Level 1:
/**
* atom0s!keygen.exe (c) 2013 [atom0s@live.com]
*
* Keygen for RDGMax CrackMe found here:
* http://forum.tuts4you.com/topic/32850-new-crackme-net/
*/

namespace atom0s_keygen
{
using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
using System.Windows.Forms;

public partial class frmMain : Form
{

/// <summary>
/// Default Constructor
/// </summary>
public frmMain()
{
InitializeComponent();
}

/// <summary>
/// Text input change event handler.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void txtUsername_TextChanged(object sender, EventArgs e)
{
if (this.txtUsername.Text.Length < 6)
{
this.txtSerial.Text = "Invalid Username Length! (6+ chars needed!)";
return;
}

var serial = this.StringToHex(this.EncryptString(this.txtUsername.Text));
this.txtSerial.Text = string.IsNullOrEmpty(serial) ? "Invalid username input; cannot create serial!" : serial;
}

/// <summary>
/// Converts the input string to a hex string.
/// </summary>
/// <param name="strInput"></param>
/// <returns></returns>
private string StringToHex(string strInput)
{
var str = string.Empty;
for (var x = 1; x <= strInput.Length; x += 1)
{
var exp = String.Format("{0:X}", (int)strInput[x - 1]);
if (exp.Length == 1) exp = "0" + exp;
str += exp;
}
return str;
}

/// <summary>
/// Encrypts the input string with DES encryption.
/// </summary>
/// <param name="strInput"></param>
/// <returns></returns>
private string EncryptString(string strInput)
{
if (string.IsNullOrEmpty(strInput))
return string.Empty;

var key = new byte[] { 0xD4, 0xED, 0x34, 0x93, 0x1C, 0x48, 0xAC, 0x08 };
var vec = new byte[] { 0x12, 0x44, 0x16, 0xEE, 0x88, 0x15, 0xDD, 0x41 };

var desProvider = new DESCryptoServiceProvider();
var stream = new MemoryStream();
var str = string.Empty;

try
{
// Convert the input to bytes..
var data = Encoding.UTF8.GetBytes(strInput);

// Encrypt the data with DES..
var encStream = new CryptoStream(stream, desProvider.CreateEncryptor(key, vec), CryptoStreamMode.Write);
encStream.Write(data, 0, data.Length);
encStream.Flush();
encStream.Close();

// Encode the return in base64 format..
str = Convert.ToBase64String(stream.ToArray());
}
catch
{
}
finally
{
stream.Close();
}

return str;
}
}
}

Excellent bro.. Solve this level (Level 2) for get the Level 3..

You Are a Machine

August 7, 2013

Excellent bro.. Solve this level (Level 2) for get the Level 3..

You Are a Machine

Level 2:

Name: atom0s

Serial: 506C3262614972635645513D

August 7, 2013

Level 2:

Name: atom0s

Serial: 506C3262614972635645513D

The level 3. Will not use the same encryption method. because you only have to know the key

August 7, 2013

Yeah level 2 the key only changed; same code as my previous keygen, just change the key to:

var key = new byte[] { 0x18, 0x45, 0x53, 0x76, 0x57, 0xB7, 0x92, 0x6A };

August 7, 2013

The [crackme] tag has been added to your topic title.

Please remember to follow and adhere to the topic title format - thankyou!

[This is an automated reply]

August 7, 2013

Level 2:

Name: master131

Serial: 776D4A552F4B3343432B7467506A7479794A79474A673D3D

Note to RDGMax, your anti-debug method using NtQueryInformationProcess with the ProcessDebugObjectHandle and ProcessDebugPort flags isn't 64-bit/AnyCPU compatible because you've declared the P/Invoke signature incorrectly.

I didn't hardcode the byte array key to show that I actually did the reversing myself.



using System;

using System.IO;

using System.Security.Cryptography;

using System.Text;

using System.Windows.Forms;
namespace RDG_CrackMe_Level_2

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }
        private byte[] GetKeyFromString(string value)

        {

            var bytes = new byte[8];

            var key = new byte[8];

            var encoding = new ASCIIEncoding();

            int charIndex = 0;

            encoding.GetBytes(value, charIndex, value.Length, bytes, charIndex);
            byte[] buffer2 = new SHA1CryptoServiceProvider().ComputeHash(bytes);

            charIndex = 0;

            do

            {

                key[charIndex] = buffer2[charIndex];

                charIndex++;

            } while (charIndex <= 7);
            return key;

        }
        public string Generate(string name)

        {

            return Sth(Se(name));

        }
        public string Sth(string StrToHex)

        {

            string str2 = string.Empty;

            for (int i = 1; i <= StrToHex.Length; i++)

            {

                string expression = ((int) StrToHex[i - 1]).ToString("X");

                if (expression.Length == 1) expression = "0" + expression;

                str2 += expression;

            }

            return str2;

        }
        public string Se(string strSource)

        {

            string str = string.Empty;

            var objDES = new DESCryptoServiceProvider();

            var Vector = new byte[] { 0x12, 0x44, 0x16, 0xEE, 0x88, 0x15, 0xDD, 0x41 };

            byte[] TheKey = GetKeyFromString("6889948"); // (0x18, 0x45, 0x53, 0x76, 0x57, 0xB7, 0x92, 0x6A)

            

            try

            {

                byte[] bytes = Encoding.UTF8.GetBytes(strSource);
                using (var stream = new MemoryStream())

                using (var stream2 = new CryptoStream(stream, objDES.CreateEncryptor(TheKey, Vector), CryptoStreamMode.Write))

                {

                    stream2.Write(bytes, 0, bytes.Length);

                    stream2.FlushFinalBlock();

                    str = Convert.ToBase64String(stream.ToArray());

                }

            }

            catch

            {

            }
            return str;

        }
        private void generateButton_Click(object sender, EventArgs e)

        {

            if (nameTextBox.Text.Length >= 6)

                serialTextBox.Text = Generate(nameTextBox.Text);

        }

    }

}

Edited August 7, 2013 by master131

August 7, 2013

Hi Again

Level 3 / 10

Include a Simple Dll

Beware atom0s is near

Download: http://www.sendspace.com/file/ic2emt

Password: crackme

Thanks

Edited August 7, 2013 by RDGMax

August 7, 2013

Level 2:

Name: master131

Serial: 776D4A552F4B3343432B7467506A7479794A79474A673D3D

Note to RDGMax, your anti-debug method using NtQueryInformationProcess with the ProcessDebugObjectHandle and ProcessDebugPort flags isn't 64-bit/AnyCPU compatible because you've declared the P/Invoke signature incorrectly.

I didn't hardcode the byte array key to show that I actually did the reversing myself.
using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
using System.Windows.Forms;

namespace RDG_CrackMe_Level_2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private byte[] GetKeyFromString(string value)
        {
            var bytes = new byte[8];
            var key = new byte[8];
            var encoding = new ASCIIEncoding();
            int charIndex = 0;
            encoding.GetBytes(value, charIndex, value.Length, bytes, charIndex);

            byte[] buffer2 = new SHA1CryptoServiceProvider().ComputeHash(bytes);
            charIndex = 0;
            do
            {
                key[charIndex] = buffer2[charIndex];
                charIndex++;
            } while (charIndex <= 7);

            return key;
        }

        public string Generate(string name)
        {
            return Sth(Se(name));
        }

        public string Sth(string StrToHex)
        {
            string str2 = string.Empty;
            for (int i = 1; i <= StrToHex.Length; i++)
            {
                string expression = ((int) StrToHex[i - 1]).ToString("X");
                if (expression.Length == 1) expression = "0" + expression;
                str2 += expression;
            }
            return str2;
        }

        public string Se(string strSource)
        {
            string str = string.Empty;
            var objDES = new DESCryptoServiceProvider();
            var Vector = new byte[] { 0x12, 0x44, 0x16, 0xEE, 0x88, 0x15, 0xDD, 0x41 };
            byte[] TheKey = GetKeyFromString("6889948"); // (0x18, 0x45, 0x53, 0x76, 0x57, 0xB7, 0x92, 0x6A)

            try
            {
                byte[] bytes = Encoding.UTF8.GetBytes(strSource);

                using (var stream = new MemoryStream())
                using (var stream2 = new CryptoStream(stream, objDES.CreateEncryptor(TheKey, Vector), CryptoStreamMode.Write))
                {
                    stream2.Write(bytes, 0, bytes.Length);
                    stream2.FlushFinalBlock();
                    str = Convert.ToBase64String(stream.ToArray());
                }
            }
            catch
            {
            }

            return str;
        }

        private void generateButton_Click(object sender, EventArgs e)
        {
            if (nameTextBox.Text.Length >= 6)
                serialTextBox.Text = Generate(nameTextBox.Text);
        }
    }
}

Has been compiled for x32 Bro

August 7, 2013

What obfuscator did you use to make repetitive functions and assigns? Or you coded all yourself?

August 7, 2013

What obfuscator did you use to make repetitive functions and assigns? Or you coded all yourself?

I used a stupid app for make garbage.. Crackme not hard bro.

Is Valid if you patch the crackme..if you get the serial number better

August 7, 2013

No I only asked what type of obfuscator you used because I love it. I will try to add for my future packer a copy of thousands of similar methods and stupid references

August 7, 2013

No I only asked what type of obfuscator you used because I love it. I will try to add for my future packer a copy of thousands of similar methods and stupid references

I not use external obfuscator bro.. only code

August 8, 2013

Has been compiled for x32 Bro

Yes I know, but I'm just saying that if you compile it for x64 or AnyCPU it won't work.

August 8, 2013

It works fine for me, I already cracked it via pm before he posted it live.

Edited August 8, 2013 by atom0s

August 8, 2013

Here is my try for level 1

Test.rar

August 8, 2013

It works fine for me, I already cracked it via pm before he posted it live.

Not same version bro.

August 8, 2013

Here is my try for level 1

Excellent.. you have to solve Level 3 now

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