Crack .net program (dll file) compilation and decompilation method_PHP tutorial

I will just give you a simple example to give you an idea, haha~~~~

1Use Tools

Reflector.exe is used to view .net code. Needless to say, it is an essential tool for learning .net

Ildasm.exe: used to compile dll, exe into IL files

ilasm.exe: used to compile IL files back to dll or exe

If you don’t have the EmEditor text processing tool, you can download it and there is a registration code EmEditor.rar

2 Basic knowledge of Ildasm and ilasm:

Usage of ilasm.exe and ildasm.exe

First open the cmd command. cd to C:Program FilesMicrosoft Visual Studio 8SDKv2.0Bin

Then pull in the dll file or exe file you want to view (because we need to use commands, you can open ildasm.exe directly or find each directory to open)

For example, text.dll (which contains console.writeline("hello word"))

ildasm text.dll Open the dll and find the method to view

ildasm text.dll /output:text.il Press Enter to compile an il file (you can open it with Notepad and edit hello word to save it)

Then use the ilasm tool to disassemble it into a dll or exe file

ilasm text Press Enter to automatically find the text4.il file and compile it into text4.exe

Or ildasm text /dll can be compiled into text.dll file (remember to delete the original text4.dll first)

3 Let’s get to work

Currently I have a program with a dongle that cannot be accessed

Start cracking

Open our program with reflector and start analyzing where there is verification

You need to have enough patience for this step

I found a way to exit the program without the dongle

Now use Ildasm.exe to open our program and dump the program into an IL file

Convert to utf-8 format

4 files will be generated

The most important thing is the il file

Open with EmEditor

Find the method SetDoLock() we want to modify

In this example I deleted them and changed them directly to

.method public hidebysig instance void void  SetDoLock() cil managed { // 代码大小 103 (0x67) .maxstack 5 IL_0000: ret } // end of method Login::SetTextBox

Save

Now we use ilasm.exe to compile the IL file back to dll or exe

The above method has already been used, so I won’t say more

C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727>ilasm.exe C:\IL\aa.il 

Okay, let’s take a look at the generated exe

Put the generated exe back into the original program and run it

Okay, the crack is successful! !

Author: bluejance Source: http://www.cnblogs.com/li-peng/

http://www.bkjia.com/PHPjc/326504.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/326504.htmlTechArticleI will just give you a simple example to give you an idea, haha~~~~ 1 Use the tool Reflector .exe is used to view .net code. Needless to say, it is an essential artifact for learning .net. Ildasm.exe:...