A .NET decompiler is a third party tool used to decompile all types of .NET binaries and libraries. Since .NET applications and executable files are compiled in IL code, in order to read the code and understand its operation, you have to convert (decompile) the IL code to C# code.
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Its great advantage over other .NET decompilers is, as I explained before, that it installs automatically together with Visual Studio (and we all know that Visual Studio is the preferred IDE for .NET development).
ILSpy is the second decompiler in this list. Like the previous one mentioned (Ildasm.exe), it is a free and open source decompiler and assembly browser, a part is based on Avalonia (AvaloniaSpy).
DnSpy, the most popular free and open source .NET decompiler? This decompiler is characterized by its large number of options and tools and above all by its UI design. Using DnSpy (for most .NET developers) is easier and more intuitive than the decompilers mentioned above.
Spices.NET is another well-known decompiler for C# applications developed by 9Rays Software Company. It features are source code recovery to avoid crashes and convert IL assemblies and executables into readable code.
9Rays categorizes Spices.NET as a flexible and efficient decompiler. Another thing that stands out is that it supports several programming languages: C#, VB.NET (Visual Basic), MSIL (Microsoft Intermediate Language), Delphi.NET and J# among others.
This next .NET application decompiler is on this list because it has been well known and historically used by many developers and companies working with .NET. Is commercial decompiler and like the previous one (Spices.Net), is paid and has a trial.
In addition, .NET Reflector features Visual Studio shorcuts, dynamic decompilation, browse assemblies and easy-to-use search filtering. Another of its advantages is that it has several add-ins, which allow you to add more functionality to the decompiler and get the most out of it.
dotPeek is another standalone decompiler that also integrates with Visual Studio. This Assembly browser belongs to the JetBrains company that offers tools for developers and development teams.
Finally, this free .NET decompiler has bookmarks: you can bookmark important parts of the code and come back to them later (like web browser bookmarks), herarchical class navigation and inheritance chains exploration.
As you have indicated decompilation has been around for a long time and these techniques are available for most mature platforms including .NET (this is true of disassembly also). Obfuscators are a popular option for folks seeking an additional layer of protection. I would add that explicit statements from the copyright owner about usage and decompilation is incredibly important. We have made it clear that using the decompiler does require the permission of the copyright holder and further that it is an optional feature.
i'm trying to learn reverse engineering for penetration testing my codes and i believe i won't learn unless i can do some practical soI'm trying to crack an application that is written in C# and all i wanna do is to find the assembly location of the if statement that checks for a license file which i believe i can bypass the license, just jumping over the if statement but i can't figure out how to do with IDA Pro or X64dbg. i'm not sure if i can do that or not because C# is byte code but i think IDA Pro and X64dbg are only for opcode applications right? and beside, bypassing it through assembly may cause other crashes in the application. i tried dnSpy and ILSpy thanks to morsisko in the comments.
now you said you're struggling with obfuscation, but obfuscation is just a way to mislead the user doing the reversing. meaning you can, sometimes with great effort, to understand what's going on behind the scenes, change variable names and function names accordingly, to make it more "logical" to you. using a decompiler can also help you see the bigger image, but it's mostly about filling the gaps, bit and bit. what i usually do in situations like that, i try to find the calling functions and trying to understand what they do, the logic behind them, what parameters they use and why, and i go with the simplest path, meaning: sometimes if function contains a lot misleading paths, but it's easier to infer the logic from the variables, you can understand what the function does, name the variables correctly, and then go over to understand the function and its implementation to avoid wasting time on dead paths(though you can check coverage to understand what parts of the code are usually used). sometimes it's just the other way around, going with the function, understanding a bit of it's logic, understanding the parameters, and then fixing the parameters and the function, but it's mostly goes down to experience with similar tasks and going with your gut, but understanding it can be wrong(hard part is knowing when to stop before going too deeply in the wrong path).
you said you wanted to crack the application, so i don't understand what you mean by that, i thought you meant like a crackme kind of task. if you really want to "crack" applications, you should know that there are lot of other defensive mechanisms such as checksums, different signatures, sometimes server verification and similar, but it all goes down to understand the logic behind what's happening. though i really don't think "cracking" is not a good path to walk at, i think that you should find better ways to use your skills for good, for instance malware analysis or hardening software/binaries by identifying weak implementations and similar.
For native code binaries, reverse engineering is hard (though not impossible). IDA (Interactive DisAssembler) is the most popular tool for disassembling native binaries back into something that is approximately human-comprehensible, though it's still not trivial to use correctly and may take some time to become proficient. The developer also publishes a decompiler, which tries to turn the binary code into something resembling C source code. Both of these are commercial (and expensive) programs, although you can get an evaluation version of IDA.
Perhaps the attacker knows that the HawkEye keylogger can be easily cracked, and to protect their own email credentials, they've hijacked a compromised email account as the initial receiver that eventually forward emails to the attacker's own email address.
de4dot takes care of .NET Reactor layer. After that - any .NET decompiler will produce readable and understandable license checking code. Rijndael is symmetrical crypto algorithm, so all necessary encryption keys are inside your program.
I would actually like to learn how to disassemble code and also help build security up in applications even though it still may be crackable I just want to push new ideas and have something to stick on my CV/resume.
PS You could also consider bringing two versions of your program. One that you only provide to legit customers and a free one that simply does not have the full features. In this case a cracker needs to get a supply or he/she needs to buy it him/herself..
The most common software crack consists of the modification of an application's binary to cause or prevent execution specific part of the program. This is accomplished by reverse engineering. This could be done by:
A lot of new software have a debugger detection techniques and will act by deferent way if the debugger is detected. Debuggers are the most used technique for cracking; many crackers will not try to de-compile your code. Putting anti debug code will increase your software protection even if you don't want to use obfuscation. Combining obfuscation and debugging prevention the right work. Many crackers use de-compiling before debugging. Without obfuscation they can jump to another place in code and go around the debugger check.
Btw, for game hacks it's also very common to load specific byte array and then mark the region as executable, and directly call address in that array in similar fashion like calling a .COM file in the DOS days. (These EXE will usually trigger warnings of heuristic scan of common antivirus) Even using a decompiler won't guarantee that you can find anything directly pluggable into your program.
AxProtector .NET also comes with optional hidden commands for CodeMeter that can be added as additional honey-trap methods in your software. Anybody trying to crack your software by attempting to decrypt all protected functions will automatically stumble into these traps and trigger the command that locks the license and stops it from being used for decrypting any more functions. This makes AxProtector .NET an excellent means against the systematic analysis of your software.
ASProtect 64 is based on all-new protection engine never used by ASPack Software before and provides software copy protection for .Net applications as well as protection against cracking and decompilation.
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One way to make an application a little bit more difficult to crack would be to deliver it as a programthat decrypts instructions, compiles and runs them only when needed. This way, if someone finds out wherethe sourcecode is stored, it will still be encrypted and without a key (or license) it is unusable. 2ff7e9595c
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