I'm working on a crack me, specifically: jaunsacco's DragonCrack and the first thing I've gotten stuck on is that the program is built mostly as a enormous main function. After attempting to decompile I get the error:
hex rays decompiler crack 29
DOWNLOAD: https://urlcod.com/2vBXPj
Another note about zip cracking is that if you have an unencrypted/uncompressed copy of any one of the files that is compressed in the encrypted zip, you can perform a "plaintext attack" and crack the zip, as detailed here, and explained in this paper. The newer scheme for password-protecting zip files (with AES-256, rather than "ZipCrypto") does not have this weakness.
I am really sad because a few days ago we launched our software developed in .Net 4.0 (Desktop application). After 3 days, its crack was available on the internet. We tried to protect the software from this but somehow people got away cracking it.
Now, following are my questions: 1- How to make sure that .Net application will not get cracked ? 2- The hacker now knows my code since he has done the modification. What steps should i take ?3- I read on the internet about - obfuscators . But the hacker knows my code what should i do ?4- Any other pro tips that i can use to avoid getting the software cracked ?5- I am not sure but can these reflector softwares also decompile the App.Config with sensitive data ?
If a computer can run your code + The hacker can run his own code at a higher privilege level than you, there is nothing that can 100% prevent your app from being cracked. Even if they just have access to the executable but not the target platform they still can step through and mimic what the target platform would do and figure out how the protection is being done.
The only copy protection I have seen to remotely delay for any period of time is what Ubisoft did with Assassin's Creed: Brotherhood. They encrypted ther levels with the game disk and it had to download the decryption key from the internet as it was needed (This is the keeping the binary out of their hands approach). But that did not work forever, eventually the hackers did get those levels decrypted and it was fully cracked. This approach is just what I saw take the longest time to get around without legal involvement (See point 2 at the bottom)
The seccond option is whoever you sell your software too have them sign a legal contract not to distribute the software (not a EULA, a actual contract that must be physically signed by the client). In that contract have large fines be applied to the person who leaks the software, then riddle your program with fingerprints that are unique to the person who buys the software so that when the program is leaked you can see who did it. (This is the method the vendor Hex-Rays use for their disassembler IDA. A quick google search could not turn up any cracked versions newer than 6.1, they are on 6.3). This method will not stop piracy, but it may discourage the copy to be leaked in the first place. This also lets you recover some lost costs associated with the program being leaked in the first place. One issue is that you will need to put a lot of fingerprints and they will need to be subtle, if a attacker can get two copies of the program and can compare the files between the two he will be able to tell what is the identifying information and just put whatever they want in so they can't tell who they got it from. The only way to do this is put a lot of red-herrings in that can't just be stripped out or randomized, also make the identifying code non-critical to running the software, if they don't have to work to crack it they are more likely to leave it in.
As others have said there really isn't anything you can do against a determined cracker if they have access to your code. Obfuscation will provide some protection against a lazy cracker. Dotfuscator is built into VS you can give it a try. Keep in mind that there is a real cost to obfuscation. It will make it very difficult to debug issues from stack traces that your (paying) customers send you.
The best answer is one you will have to accept. You can't. Just focus on giving your users a great user experience, and make licensing very easy. The possibility that your application can be cracked does not mean that choosing to build a desktop application was a bad idea. Pirates will be pirates and honest customers will be honest customers.
If you write a business application you would not also write the database engine that stores the data. You should also not write the crack prevention code for your application. That is not what solves your customer's problem, and it takes a tremendous skill set to do it right.
The Interactive Disassembler (IDA) is a disassembler for computer software which generates assembly language source code from machine-executable code. It supports a variety of executable formats for different processors and operating systems. It also can be used as a debugger for Windows PE, Mac OS X Mach-O, and Linux ELF executables. A decompiler plug-in for programs compiled with a C/C++ compiler is available at extra cost. The latest full version of IDA Pro is commercial; while an earlier and less capable version is available for download free of charge (version 7.0 as of February 2018).
With knowledge about what we are dealing with or, to be precise, what programming language and compiler this application was created with, we begin analysis in disassembler or decompiler. It is their task to analyze compiled, binary file and display its code and structure in a way easy for a human to understand.
Such output code, because of its simplicity and most information stored in the form of pseudo instructions and metadata, resulted in the fact that decompiling in such cases is much more simple than decompiling x86 or x64 code. This caused creation of many dedicated decompilers, that became a nightmare of programmers writing in those languages, as it was very easy for anyone to take a peek at unprotected software, practically it's the version with source code wide open.
It may not be entirely up to the functionality of HexRays at the moment (remember that Ghidra is a new project), but tools such as decompilers require a lot of work and it is rare to see a new product that someone offers for free.
When you must face analysis of software created in a programming language based on .NET Framework, e.g. C# or VB#, .NET Reflector decompiler will prove invaluable help. With its help, you will be able to quickly and efficiently take a peek at application's structure and code.
If you've ever used or you keep using well-known decompiler JAD (that was discontinued in 2001) then it's about time for an update, not only does JD-GUI support new elements of Java language, but also navigation over decompiled project is very easy and fun.
It also needs to be mentioned that, just like with .NET applications, that have been protected with obfuscators, Java applications can be protected and then decompiler functioning is limited or even impossible.
Disassembler and decompiler IDR or Interactive Delphi Reconstructor is a tool meant only for application analysis in popular Delphi environment. It is a very useful tool comparing to e.g. IDA because it can analyze internal structures of Delphi application, has built-in form viewer, that allows for fast and easy finding of events assigned to controls on the form (e.g. button1.OnClick). IDR has vast databases of signatures of standard Delphi environment libraries in all available versions, so in output deadlisting we will see friendly function names.
Number of supported features is really impressing, plugins, built-in scripting language, Yara signatures scanning, built-in decompiler and many more. And it's development is very active. Taking the fact that 64 bit OllyDbg never left the development stage, x64dbg has become de facto standard debugger for 64 bit applications.
In the previous IDA Pro article, we took a look at the basics of reverse engineering source code and binary files. This rare dissertation committed to impart cracking and byte patching in a binary executable using IDA Pro with the intention of subverting various security constraints as well as generating or producing the latest modified version (Patched) of that particular binary. IDA Pro is typically utilized to analyze the disassembled code of a binary so that the internal mechanism could be comprehended and identify the inherent vulnerability in the source code.
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