DNGuard HVM v3.97

[0x59]

View File

DNGuard HVM v3.97

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This file is protected using DNGuard HVM 3.97.

Protections used : 

• HVM
• Jit

Challenge is to unpack and post details of methods used.

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• Submitter
  0x59
• Submitted
  01/02/2021
• Category
  UnPackMe (.NET)

 

[0x59]

I found a way to turn on HVM on trial edition 

So , it will show "this can't be run on this pc"

[AzoresRCE]

Console.WriteLine("Hello");
Console.WriteLine("This is unpackme");
Console.ReadKey();

 

[0x59]

On 1/3/2021 at 7:03 AM, AzoresRCE said:

Console.WriteLine("Hello");
Console.WriteLine("This is unpackme");
Console.ReadKey();

 

He solve the challenge but moderators deleted his post

Edited January 6, 2021 by 0x59

[AzoresRCE]

1 hour ago, 0x59 said:

omfg u made me laugh 
everyone know the code is like that but u have to unpack it 
or if u realy unpacked it send unpacked file 

 

HVM.exe

[0x59]

18 hours ago, AzoresRCE said:

 

HVM.exe 4.5 kB · 3 downloads

great job. 

try v2

[BlackHat]

Both of Your Challenges are Unpacked Successfully.

 

How to Unpack ?

Spoiler

Now DNGuard use VMP as wrapper if you protect the EXE. So Run the File and Dump the Module from Memory along with the Runtime DLL. Analyze the DLL for further Actions. DNG do not use VMP VM. In case of C#, They simply protect the assembly wit their functions and then put fake layer of C++ Native and wrapped it in VMP.

1. You need to Hook the JIT Code at Runtime by executing the file.
2. Now Detect the Method Bodies in JIT and Read it with .Net Libraries, Your main work is to restore the value of Instructions but Here is a catch that Method Tokens are encrypted/locked in HVM Version.
3. You need to Analyze and understand the Runtime.dll to Restore the value.
4. You can Restore the Original and Remove proxy by analyzing the methods after devirting.
5. Strings are also encrypted but just Invoke static string methods in "ZYXDNGuarder" and restore those with Original Value.

Decrypt HVM Token and the Offset Value of HVM Table --> Parse their Structure Schema and Read HVM Table

At Last Read Methods after detecting those and append in your Main Assembly.

Proof -

Spoiler

 

HVM-hvm.exe HVM-cleaned_debug.exe

[DemonW]

On 8/29/2021 at 5:23 AM, BlackHat said:

Both of Your Challenges are Unpacked Successfully.

 

How to Unpack ?

  Hide contents

Now DNGuard use VMP as wrapper if you protect the EXE. So Run the File and Dump the Module from Memory along with the Runtime DLL. Analyze the DLL for further Actions. DNG do not use VMP VM. In case of C#, They simply protect the assembly wit their functions and then put fake layer of C++ Native and wrapped it in VMP.

1. You need to Hook the JIT Code at Runtime by executing the file.
2. Now Detect the Method Bodies in JIT and Read it with .Net Libraries, Your main work is to restore the value of Instructions but Here is a catch that Method Tokens are encrypted/locked in HVM Version.
3. You need to Analyze and understand the Runtime.dll to Restore the value.
4. You can Restore the Original and Remove proxy by analyzing the methods after devirting.
5. Strings are also encrypted but just Invoke static string methods in "ZYXDNGuarder" and restore those with Original Value.

Decrypt HVM Token and the Offset Value of HVM Table --> Parse their Structure Schema and Read HVM Table

At Last Read Methods after detecting those and append in your Main Assembly.

Proof -

  Hide contents

 

HVM-hvm.exe 3 kB · 3 downloads HVM-cleaned_debug.exe 4.5 kB · 2 downloads

Can you tell me more about how to analyze the Runtime.dll? Thank you.

I dumped the exe file and the managed runtime DNRuntime.dll. The DNRuntime.dll imports a function named VMRuntime from kernel32.dll. I guess it renamed the native runtime module to kernel32.dll, but I didn't find the extra kernel32.dll module in the module list of the process. What am I doing wrong?

Edited September 1, 2021 by DemonW
Describe my problem in detail

[hangocthanh3107]

Hi friend, i looking for tool DNGuard HMA can you share it for me?

[sayedidrees]

can someone share the whole dnguard setup?

[BlueZ]

Hi friend, i looking for tool DNGuard HMA can you share it for me?

[a205321]

On 8/30/2021 at 11:05 AM, DemonW said:

Can you tell me more about how to analyze the Runtime.dll? Thank you.

I dumped the exe file and the managed runtime DNRuntime.dll. The DNRuntime.dll imports a function named VMRuntime from kernel32.dll. I guess it renamed the native runtime module to kernel32.dll, but I didn't find the extra kernel32.dll module in the module list of the process. What am I doing wrong?

 

On 8/30/2021 at 11:05 AM, DemonW said:

Can you tell me more about how to analyze the Runtime.dll? Thank you.

I dumped the exe file and the managed runtime DNRuntime.dll. The DNRuntime.dll imports a function named VMRuntime from kernel32.dll. I guess it renamed the native runtime module to kernel32.dll, but I didn't find the extra kernel32.dll module in the module list of the process. What am I doing wrong?

i have the same  problem as you