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VMProtect v3.5.0.1213


whoknows
Go to solution Solved by BlackHat,

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VMProtect v3.5.0.1213


Try to unpack or alternatively provide a serial. If there is no solution provided by Saturday 11am (GMT+0) I will attach the same without debugger detection.

Protections used:

Debugger detection (User-mode + Kernel-mode)

Ultra (Mutation + Virtualization)


 

Edited by whoknows
  • Like 1
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  • 3 weeks later...

Here is one of the solutions:

Spoiler

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACsbHDTcxIP0LWYgmPM663d4ylbijmKAs0o0gXodxQEb

It uses cryptography to decrypt a string provided withing the key,key also contains RV and salt,which I both set to all \0,if it succeeds then it prints hi <DecrytpedString> thanks for registering,if it fails it prints invalid serial

 

Edit:

Decrypted Validate function:

Spoiler

ValidateFunc.png.81d689de80e36125f19de28f995784fd.png

 

Edited by BataBo
Link to comment

Fun challenge. I went for finding just the key algorithm rather than fully devirtualizing, but the code is pretty clear. Here some sample keys:

Spoiler

whoknows: DkkLJ5UOI5DizM/Z7UhGQRt3dsR+OeyHlNNcQgmgFERdCXocbP6A3pMWWkhwqxLSMKEBN90qktRdhJPCsuCHQtm6M1GdlMtcFhkW5L+YTeaT3JAeZ+GTofwXKiD9ATdd

washi: t4t7484q1B32mDFo36MW6MCKEWef3WYzd6W/6Gq9K7OPGJDkMC8DBs3jQEX5KfW5basCKM4fo9klSGwoauyyOL4FCXtz5hcdTYLPVRpWIWi+CIgPv/36P9iEuU5l0Nnu

tuts4you: bX3YxhIyuJGGC5q7nCA5Ta8Ger+7AuRwdLe+58Pam+AwB9h8US6mO/NwosOE6DwEDx55ZHHzfGqZaFJbc9DNq3ZZv+pkwKhd5Vt3j3WpVFxTyhBxIflEAaymH08V5FqD

Approach:

Spoiler
  • Notice Validate is virtualized using VMP, and returns a string which is later displayed. => returned value is probably the name.
  • Notice that VM reads code using method  0x06000046. Also notice that field  0x04000048 is the virtual program counter and field 0x0400004A contains the stack.
  • Use this harmony script to perform a VM trace that dumps the program counter, stack contents and calls.
  • First run with garbage data reveals it requires a base64 string.
  • Second run, with a random base64 string reveals the key consists of three parts: first and second part are both 32 bytes, the rest is of arbitrary length.
  • Third run with hex data 00010203...4b4c4d4e4f reveals all that is necessary to create a keygen (full trace https://pastebin.com/Qcc2ULc6)
  • Notice it creates a new instance of Rfc2898DeriveBytes using 'tetris' as password, the first 32 bytes of the serial as salt, and 1000 iterations
  • Notice it creates a new instance of RijndaelManaged with blocksize = 256, mode = CBC, padding = PKCS7, and IV = the second part of the serial.
  • Notice it attempts to decrypt the remaining part of the serial using this instance of RijndaelManaged.
  • Keygen is simply doing the reverse of all operations in the trace.
  • Notice the decrypted data is returned and displayed => encrypted data is username encrypted using the same algorithm.

Keygen.7z

Edited by Washi
  • Like 2
  • Thanks 8
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16 hours ago, Washi said:

Fun challenge. I went for finding just the key algorithm rather than fully devirtualizing, but the code is pretty clear. Here some sample keys:

  Hide contents

whoknows: DkkLJ5UOI5DizM/Z7UhGQRt3dsR+OeyHlNNcQgmgFERdCXocbP6A3pMWWkhwqxLSMKEBN90qktRdhJPCsuCHQtm6M1GdlMtcFhkW5L+YTeaT3JAeZ+GTofwXKiD9ATdd

washi: t4t7484q1B32mDFo36MW6MCKEWef3WYzd6W/6Gq9K7OPGJDkMC8DBs3jQEX5KfW5basCKM4fo9klSGwoauyyOL4FCXtz5hcdTYLPVRpWIWi+CIgPv/36P9iEuU5l0Nnu

tuts4you: bX3YxhIyuJGGC5q7nCA5Ta8Ger+7AuRwdLe+58Pam+AwB9h8US6mO/NwosOE6DwEDx55ZHHzfGqZaFJbc9DNq3ZZv+pkwKhd5Vt3j3WpVFxTyhBxIflEAaymH08V5FqD

Approach:

  Reveal hidden contents
  • Notice Validate is virtualized using VMP, and returns a string which is later displayed. => returned value is probably the name.
  • Notice that VM reads code using method  0x06000046. Also notice that field  0x04000048 is the virtual program counter and field 0x0400004A contains the stack.
  • Use this harmony script to perform a VM trace that dumps the program counter, stack contents and calls.
  • First run with garbage data reveals it requires a base64 string.
  • Second run, with a random base64 string reveals the key consists of three parts: first and second part are both 32 bytes, the rest is of arbitrary length.
  • Third run with hex data 00010203...4b4c4d4e4f reveals all that is necessary to create a keygen (full trace https://pastebin.com/Qcc2ULc6)
  • Notice it creates a new instance of Rfc2898DeriveBytes using 'tetris' as password, the first 32 bytes of the serial as salt, and 1000 iterations
  • Notice it creates a new instance of RijndaelManaged with blocksize = 256, mode = CBC, padding = PKCS7, and IV = the second part of the serial.
  • Notice it attempts to decrypt the remaining part of the serial using this instance of RijndaelManaged.
  • Keygen is simply doing the reverse of all operations in the trace.
  • Notice the decrypted data is returned and displayed => encrypted data is username encrypted using the same algorithm.

Keygen.7z 7.15 kB · 7 downloads

Are you sure it's correct,the key isn't 'tetris' the key is 'duck',keys provided above don't work.

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3 hours ago, BataBo said:

Are you sure it's correct,the key isn't 'tetris' the key is 'duck',keys provided above don't work.

Whoops you are completely right, I posted my reply to the wrong vmp crackme/unpackme challenge thread. @whoknows has made two threads :D

This one is actually easier, since code is pretty much readable (after you dumped it from memory that is). And yea, the password for this one is indeed "duck" rather than tetris. :)

 

Edited by Washi
  • Like 2
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  • 3 weeks later...
  • 4 weeks later...
  • 2 weeks later...
  • 3 months later...
Spoiler

 





using System;
using System.ComponentModel;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Windows.Forms;

namespace awesome
{
	// Token: 0x02000002 RID: 2
	public class Form1 : Form
	{
		// Token: 0x06000002 RID: 2 RVA: 0x00002097 File Offset: 0x00000297
		public Form1()
		{
			this.InitializeComponent();
		}

		// Token: 0x06000003 RID: 3 RVA: 0x00002888 File Offset: 0x00000A88
		private void button1_Click(object sender, EventArgs e)
		{
			string text = null;
			try
			{
				text = Form1.Validate(this.textBox1.Text);
			}
			catch
			{
                this.label2.ForeColor = Color.Red;
				this.label2.Text = "invalid serial";
			}
			finally
			{
				if (text != null)
				{
                    this.label2.ForeColor = Color.DarkGreen;
					this.label2.Text = string.Format("hi {0} thanks for registering", text);
				}
			}
		}

		// Token: 0x06000004 RID: 4 RVA: 0x000028F8 File Offset: 0x00000AF8
		public static string Validate(string ikari)
		{
			byte[] array = Convert.FromBase64String(ikari);
			byte[] salt = array.Take(32).ToArray<byte>();
			byte[] rgbIV = array.Skip(32).Take(32).ToArray<byte>();
			byte[] array2 = array.Skip(64).Take(array.Length - 64).ToArray<byte>();
			string @string;
			using (Rfc2898DeriveBytes rfc2898DeriveBytes = new Rfc2898DeriveBytes("duck", salt, 1000))
			{
				byte[] bytes = rfc2898DeriveBytes.GetBytes(32);
				using (RijndaelManaged rijndaelManaged = new RijndaelManaged())
				{
					rijndaelManaged.BlockSize = 256;
					rijndaelManaged.Mode = CipherMode.CBC;
					rijndaelManaged.Padding = PaddingMode.PKCS7;
					using (ICryptoTransform cryptoTransform = rijndaelManaged.CreateDecryptor(bytes, rgbIV))
					{
						using (MemoryStream memoryStream = new MemoryStream(array2))
						{
							using (CryptoStream cryptoStream = new CryptoStream(memoryStream, cryptoTransform, CryptoStreamMode.Read))
							{
								byte[] array3 = new byte[array2.Length];
								int count = cryptoStream.Read(array3, 0, array3.Length);
								memoryStream.Close();
								cryptoStream.Close();
								@string = Encoding.UTF8.GetString(array3, 0, count);
							}
						}
					}
				}
			}
			return @string;
		}

		// Token: 0x06000005 RID: 5 RVA: 0x00002A64 File Offset: 0x00000C64
		protected override void Dispose(bool disposing)
		{
			if (disposing && this.components != null)
			{
				this.components.Dispose();
			}
			base.Dispose(disposing);
		}

		// Token: 0x06000006 RID: 6 RVA: 0x00002AEC File Offset: 0x00000CEC
		private void InitializeComponent()
		{
			this.textBox1 = new TextBox();
			this.button1 = new Button();
			this.label2 = new Label();
			base.SuspendLayout();
			this.textBox1.BorderStyle = BorderStyle.FixedSingle;
			this.textBox1.Font = new Font("Consolas", 9.75f);
			this.textBox1.Location = new Point(13, 45);
			this.textBox1.Multiline = true;
			this.textBox1.Name = "textBox1";
			this.textBox1.Size = new Size(348, 66);
			this.textBox1.TabIndex = 1;
			this.button1.Font = new Font("Consolas", 9.75f);
			this.button1.Location = new Point(12, 117);
			this.button1.Name = "button1";
			this.button1.Size = new Size(349, 35);
			this.button1.TabIndex = 2;
			this.button1.Text = "validate";
			this.button1.UseVisualStyleBackColor = true;
			this.button1.Click += this.button1_Click;
			this.label2.Font = new Font("Consolas", 9.75f);
			this.label2.Location = new Point(12, 9);
			this.label2.Name = "label2";
			this.label2.Size = new Size(349, 23);
			this.label2.TabIndex = 4;
			this.label2.Text = "welcome!";
			this.label2.TextAlign = ContentAlignment.MiddleCenter;
			base.AutoScaleDimensions = new SizeF(6f, 13f);
			base.AutoScaleMode = AutoScaleMode.Font;
			base.ClientSize = new Size(373, 160);
			base.Controls.Add(this.label2);
			base.Controls.Add(this.button1);
			base.Controls.Add(this.textBox1);
			base.FormBorderStyle = FormBorderStyle.FixedToolWindow;
			base.MaximizeBox = false;
			base.Name = "Form1";
			base.StartPosition = FormStartPosition.CenterScreen;
			base.Text = "VMYarrak v3.5.0.1213";
			base.ResumeLayout(false);
			base.PerformLayout();
		}

		// Token: 0x04000001 RID: 1
		private IContainer components;

		// Token: 0x04000002 RID: 2
		private TextBox textBox1;

		// Token: 0x04000003 RID: 3
		private Button button1;

		// Token: 0x04000004 RID: 4
		private Label label2;
	}
}

 

Download: https://s4.dosya.tc/server13/tkpa2e/awesome.vmp_clean.exe.html

Key: HlgoynfyxFiMv94XScOTlJA65DTJrPd9pRY0zI3mKyO+IOunYkFdYWn6lGCufjKvVLrzZ94ivnJgqyVgvfjKpSyN4ImrVY/Bl5XU7+ne859RySqgyX919rcgIs6mk6OK

SS

rlXVEi.png

 

Edited by Leopar36
  • Thanks 1
  • Haha 1
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  • 3 weeks later...
bruhware2811
On 2/12/2021 at 9:56 PM, Leopar36 said:
  Reveal hidden contents

 




using System;
using System.ComponentModel;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Windows.Forms;

namespace awesome
{
	// Token: 0x02000002 RID: 2
	public class Form1 : Form
	{
		// Token: 0x06000002 RID: 2 RVA: 0x00002097 File Offset: 0x00000297
		public Form1()
		{
			this.InitializeComponent();
		}

		// Token: 0x06000003 RID: 3 RVA: 0x00002888 File Offset: 0x00000A88
		private void button1_Click(object sender, EventArgs e)
		{
			string text = null;
			try
			{
				text = Form1.Validate(this.textBox1.Text);
			}
			catch
			{
                this.label2.ForeColor = Color.Red;
				this.label2.Text = "invalid serial";
			}
			finally
			{
				if (text != null)
				{
                    this.label2.ForeColor = Color.DarkGreen;
					this.label2.Text = string.Format("hi {0} thanks for registering", text);
				}
			}
		}

		// Token: 0x06000004 RID: 4 RVA: 0x000028F8 File Offset: 0x00000AF8
		public static string Validate(string ikari)
		{
			byte[] array = Convert.FromBase64String(ikari);
			byte[] salt = array.Take(32).ToArray<byte>();
			byte[] rgbIV = array.Skip(32).Take(32).ToArray<byte>();
			byte[] array2 = array.Skip(64).Take(array.Length - 64).ToArray<byte>();
			string @string;
			using (Rfc2898DeriveBytes rfc2898DeriveBytes = new Rfc2898DeriveBytes("duck", salt, 1000))
			{
				byte[] bytes = rfc2898DeriveBytes.GetBytes(32);
				using (RijndaelManaged rijndaelManaged = new RijndaelManaged())
				{
					rijndaelManaged.BlockSize = 256;
					rijndaelManaged.Mode = CipherMode.CBC;
					rijndaelManaged.Padding = PaddingMode.PKCS7;
					using (ICryptoTransform cryptoTransform = rijndaelManaged.CreateDecryptor(bytes, rgbIV))
					{
						using (MemoryStream memoryStream = new MemoryStream(array2))
						{
							using (CryptoStream cryptoStream = new CryptoStream(memoryStream, cryptoTransform, CryptoStreamMode.Read))
							{
								byte[] array3 = new byte[array2.Length];
								int count = cryptoStream.Read(array3, 0, array3.Length);
								memoryStream.Close();
								cryptoStream.Close();
								@string = Encoding.UTF8.GetString(array3, 0, count);
							}
						}
					}
				}
			}
			return @string;
		}

		// Token: 0x06000005 RID: 5 RVA: 0x00002A64 File Offset: 0x00000C64
		protected override void Dispose(bool disposing)
		{
			if (disposing && this.components != null)
			{
				this.components.Dispose();
			}
			base.Dispose(disposing);
		}

		// Token: 0x06000006 RID: 6 RVA: 0x00002AEC File Offset: 0x00000CEC
		private void InitializeComponent()
		{
			this.textBox1 = new TextBox();
			this.button1 = new Button();
			this.label2 = new Label();
			base.SuspendLayout();
			this.textBox1.BorderStyle = BorderStyle.FixedSingle;
			this.textBox1.Font = new Font("Consolas", 9.75f);
			this.textBox1.Location = new Point(13, 45);
			this.textBox1.Multiline = true;
			this.textBox1.Name = "textBox1";
			this.textBox1.Size = new Size(348, 66);
			this.textBox1.TabIndex = 1;
			this.button1.Font = new Font("Consolas", 9.75f);
			this.button1.Location = new Point(12, 117);
			this.button1.Name = "button1";
			this.button1.Size = new Size(349, 35);
			this.button1.TabIndex = 2;
			this.button1.Text = "validate";
			this.button1.UseVisualStyleBackColor = true;
			this.button1.Click += this.button1_Click;
			this.label2.Font = new Font("Consolas", 9.75f);
			this.label2.Location = new Point(12, 9);
			this.label2.Name = "label2";
			this.label2.Size = new Size(349, 23);
			this.label2.TabIndex = 4;
			this.label2.Text = "welcome!";
			this.label2.TextAlign = ContentAlignment.MiddleCenter;
			base.AutoScaleDimensions = new SizeF(6f, 13f);
			base.AutoScaleMode = AutoScaleMode.Font;
			base.ClientSize = new Size(373, 160);
			base.Controls.Add(this.label2);
			base.Controls.Add(this.button1);
			base.Controls.Add(this.textBox1);
			base.FormBorderStyle = FormBorderStyle.FixedToolWindow;
			base.MaximizeBox = false;
			base.Name = "Form1";
			base.StartPosition = FormStartPosition.CenterScreen;
			base.Text = "VMYarrak v3.5.0.1213";
			base.ResumeLayout(false);
			base.PerformLayout();
		}

		// Token: 0x04000001 RID: 1
		private IContainer components;

		// Token: 0x04000002 RID: 2
		private TextBox textBox1;

		// Token: 0x04000003 RID: 3
		private Button button1;

		// Token: 0x04000004 RID: 4
		private Label label2;
	}
}

 

Download: https://s4.dosya.tc/server13/tkpa2e/awesome.vmp_clean.exe.html

Key: HlgoynfyxFiMv94XScOTlJA65DTJrPd9pRY0zI3mKyO+IOunYkFdYWn6lGCufjKvVLrzZ94ivnJgqyVgvfjKpSyN4ImrVY/Bl5XU7+ne859RySqgyX919rcgIs6mk6OK

SS

rlXVEi.png

 

How did you clean it so well? Do you have any tools?

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  • 6 months later...
On 11/3/2020 at 1:35 PM, BlackHat said:

awesome.vmp35_cracked.exe 493 kB · 29 downloads

Every other portion of VMP is removed including CRC etc check. But still it will not run until we fix Delegates. It is still left 

  Reveal hidden contents

I did almost same approach on this - https://telegra.ph/VMP-Unpacking-11-02

rxIPgz1.png

 

I forgot this Post btw It was fine except Delegates which can be fixed easily.

awesome_done.exe

Link to comment
  • 1 month later...

hey guys

 

i know you're all too busy with life for arranging a tutorial but could you please at least say the steps you took or refer to other pertaining tutorials/papers?

Link to comment

Have to agree with the posts above. Most of the solutions here are not really tutorials. They are mostly just a binary / source code that is cleared without any explanation of how it is done, which is what tuts4you I believe is meant to be about.

Link to comment
  • 1 month later...
  • Solution

How to Unpack this VMProtect 3.5 Challenge - 2022/01/10 by @BlackHat

Tutorial :

Spoiler

Step 1. Start KSDumper and Dump the Challenge from Memory by running it. Download Here - https://github.com/EquiFox/KsDumper from GitHub. You can also use any Kernel base Dumper or JIT Dumper https://github.com/Anonym0ose/JitDumper
(When You use KSDumper, You may have to Load Unsafe Driver which you can do by running them using Command Prompt if only You are getting Access Denied error by running normally)

Step 2. Fix Sections Header of your Dumped File using CFF Explorer. Download from - https://ntcore.com/?tag=cff-explorer here and Fix the Broken value and Untick the IL only check in .NET section.

Step 3. Now Clean the Mutations of VMProtect using Demutation Tool made by wwh1004. You can read here - https://github.com/wwh1004/blog/tree/master/[.NET]反混淆VMP.NET之Mutation
(You can also download the Compiled file from this Link - https://disk.yandex.com/d/Zq2q-6YnkrDWiQ )

Step 4. Clean the File using de4dot. Use the Official de4dot without any mod. You can Download from Here - https://github.com/de4dot/de4dot
(Use --keep-names ntpfg while cleaning the file using de4dot)

Step 5. Use VMP Killer by DarkBullNull. Download Here - https://github.com/DarkBullNull/VMP.NET-Kill/releases/download/2.1/Release.rar
(Use Option 2 First and Fix CRC and Debug Check and after this use Option 4 to uncover the Hide Call Method)

Step 6. Open the Unpacked File in dnSpy and go to Module.cctor and nop the call.

Step 7. Crack the Validation Method and Get Profit.

Video Tutorial : 

 

Best Regards

BlackHat

awesome.vmp35_BH_unp.exe

  • Like 3
  • Thanks 4
Link to comment
18 hours ago, BlackHat said:

Bu VMProtect 3.5 Mücadelesi Nasıl Açılır - 2022/01/10 tarafından @Siyah şapka

öğretici :

  Gizli içerikleri ortaya çıkarın

Step 1. Start KSDumper and Dump the Challenge from Memory by running it. Download Here - https://github.com/EquiFox/KsDumper from GitHub. You can also use any Kernel base Dumper or JIT Dumper https://github.com/Anonym0ose/JitDumper
(When You use KSDumper, You may have to Load Unsafe Driver which you can do by running them using Command Prompt if only You are getting Access Denied error by running normally)

Step 2. Fix Sections Header of your Dumped File using CFF Explorer. Download from - https://ntcore.com/?tag=cff-explorer here and Fix the Broken value and Untick the IL only check in .NET section.

Step 3. Now Clean the Mutations of VMProtect using Demutation Tool made by wwh1004. You can read here - https://github.com/wwh1004/blog/tree/master/[.NET]反混淆VMP.NET之Mutation
(You can also download the Compiled file from this Link - https://disk.yandex.com/d/Zq2q-6YnkrDWiQ )

Step 4. Clean the File using de4dot. Use the Official de4dot without any mod. You can Download from Here - https://github.com/de4dot/de4dot
(Use --keep-names ntpfg while cleaning the file using de4dot)

Step 5. Use VMP Killer by DarkBullNull. Download Here - https://github.com/DarkBullNull/VMP.NET-Kill/releases/download/2.1/Release.rar
(Use Option 2 First and Fix CRC and Debug Check and after this use Option 4 to uncover the Hide Call Method)

Step 6. Open the Unpacked File in dnSpy and go to Module.cctor and nop the call.

Step 7. Crack the Validation Method and Get Profit.

Video Eğitimi : 

  Gizli içerikleri ortaya çıkarın

 

Saygılarımla

Siyah şapka

harika.vmp35_BH_unp.exe 95 kB · 2 indirme

 

Hello, can you upload the tools in the tutorial, thank you very much, you did a great job.

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