CrackMe-DotNet

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Source codes for CrackMe with modern GUI forms written in Visual C++ with CLR (.NET Framework)

CrackMe-DotNet 최신버젼 다운로드

최종 버전 다운로드 (.zip)

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# CrackMe Source Code (.NET Framework)
This repository offers source codes for CrackMes with modern GUI forms written in Visual C++ with CLR. The main target of this repository is CTF organizers or Computer Science students who would like to develop small CrackMe with modern GUI or anyone interested in Software Reverse Engineering.

You can find a compiled EXE binary in Release folder for each CrackMe.

![Sample](https://github.com/d4ichi/CrackMe-DotNet/blob/master/Resource/img/sample.png)

## For CrackMe Creators
Indeed I provide some simple key evaluation functions, you can edit it and make your CrackMe harder as much as you want. All CrackMe here can popup information dialog. So you can put some information about your CTF, author, deadline, or instructions with just replacing some sentences.

## For Computer Science Students
If you are studying Software Reverse Engineering, reversing CrackMe is a good way to start your practical exercise. If you don't feel you are ready for CrackMes out there on GitHub, you could start coding your own CrackMe and analyze it. It will be much easier to play around with because you are the creator of the CrackMe.
Additionally, it's good for learning Reverse Engineering to observe the consequence of your code/implementation of obfuscation in reversed form.

## Contents

### CrackMe00
No user inputs are required.
This CrackMe gets the date when it's launched and check if it's before the expiration date.

![CrackMe](https://github.com/d4ichi/CrackMe-DotNet/blob/master/Resource/img/crackme_no_input.png)

### CrackMe01
One user input is required.
This CrackMe compares user input with a plain text key.

![CrackMe](https://github.com/d4ichi/CrackMe-DotNet/blob/master/Resource/img/crackme_one_input.png)

Key for the sample binary:

```
FH8YALGR
```

### CrackMe02
One user input is required.
GUI is the same as above with a bit more obfuscation for key evaluation. The key is not saved in plain text. The characters' order is reversed.

Key for the sample binary:

```
hellocrackme
```

### CrackMe03
Two user inputs are required.
One is a username and another is a key. The correct key is generated by combining characters one after another from both built-in seed and username.

![CrackMe](https://github.com/d4ichi/CrackMe-DotNet/blob/master/Resource/img/crackme_two_input.png)

An example key combination for the sample binary:

```
Username: kevinm
Key: Xk6eDveinnGmiE
```

## Requirements
- All source codes here are written in Microsoft Visual Studio 2017.
- Microsoft Visual C++ with CLR
- Target Platform: Windows Desktop 32Bit/64Bit with .NET Framework enabled

Install "Desktop development with C++" workload with "C++/CLI support."

![VS2017](https://github.com/d4ichi/CrackMe-DotNet/blob/master/Resource/img/vs2017_installation.png)

## How to Build
Clone the entire repository first and open solution file (.sln) on Visual Studio.
To build the solution, you have to manually set 2 properties for each solution.
Navigate to "Project -> Properties" on Visual Studio toolbar and set two properties. Make sure set "Configuration: All Configurations" and "Platform: All Platforms" before you set the values below.

- Linker -> System -> Subsystem: Windows [(detail)](https://github.com/d4ichi/CrackMe-DotNet/blob/master/Resource/img/config01.png "detail")
- Linker -> Advanced -> Entry Point: main  [(detail)](https://github.com/d4ichi/CrackMe-DotNet/blob/master/Resource/img/config02.png "detail")

Then, hit "Build -> Build Solution" on toolbar to build the solution!

## Notes
I will update/add new CrackMe source codes or templates occasionally.
The "ClaimToFame CTF" is an imaginary competition. Replace it to whatever you want.

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