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admin | Category: Phone Lookup Free | 19.10.2015
Practice for certification success with the Skillset library of over 100,000 practice test questions. After covering the basics of dot NET reverse engineering in first articles (refer to the references), it’s time to go more in depth of the dot NET MSIL assembly language. In this article I’ll present you IL assembly much more in depth and how we can deal with two synchronized tools to remove the first protection of a Crack Me I made for this purpose.
The IL assembler and disassembler were first made as strict internal tools used to facilitate the development of the Common Language Runtime. Before starting the analysis of our target (not yet presented), I will clarify in depth some dot NET aspects starting by the Common Language Runtime. Dot NET assemblies and modules which are designed to run under the Common Language Runtime – CLR are composed essentially by Metadata and Managed Code.
A nag screen that we have to remove and a windows form asking for a serial number, and we will discover together how we can use some creative round trip engineering to remove all protections present on this Crack Me. First of all, let’s disassemble our Crack Me using ILDASM and see the IL code embedded in our managed module.
As you know IL is strictly a stack based language, everything MUST pass through the evaluation stack, and every instruction puts or takes something (or nothing) from the top of the evaluation stack.
The return instruction ret, returns immediately to the call site, depending on the called method, ret returns one value of a certain type and this type have to be on the evaluation stack, in the case the method concerned, it returns void type, meaning the evaluation stack must be empty at the moment of return (as in this case). Now we know that this method (which is Form1_Load) does one thing only: preparing and showing the nag screen and we have to get rid of it.


Technically we have to generate an .il file from our assembly (by dumping it from ILDasm), manipulate it and reassemble it, but before doing this we have to know the version of our assembly so we can recompile it (using ILASM) without getting problems.
Now we need to reassemble our modified .il file, and we will use ILAsm assembler, a tool provided with Visual Studio and Windows SDK. If you want to bypass the serial validation or want to calculate the correct serial, this may be relatively easy. I want to show you how we can take advantage of some “creative” round trip engineering and let the Crack Me do something that it was not supposed to do, like tell us the correct serial number! Soufiane Tahiri is is an InfoSec Institute contributor and computer security researcher, specializing in reverse code engineering and software security. InfoSec institute respects your privacy and will never use your personal information for anything other than to notify you of your requested course pricing. Once you can handle these tools and know the “basics” of round trip engineering, I will present you with a second article on advanced round trip engineering to perform some more advanced manipulation on the same Crack Me software to remove the second protection – so take a long breath because here we go!
When both tools became synchronized enough, third party dot NET oriented compilers based on ILAsm started to appear along with dot NET Frameworks class library, compilers and tools was released to the developers’ community.
Despite of the high level language in which it was developed with, it was made independently of the target platform.
It describes the relationship between classes, their members, the return types, global items, and methods parameters.
I’ll take you through this piece of code line by line to clarify what it does and what we will have to do.


The keyword public means that the method Frm1_Load() can be accessed by all members for whom the mother class of Form1_Load() is visible. We can remove all instruction inside our method or remove to whole method, forcing a ret at the beginning. With it, we will be able to generate portable executables from Microsoft Intermediate Language.
The user must respond to the message box before continuing work in the current application. We have been training Information Security and IT Professionals since 1998 with a diverse lineup of relevant training courses. To generalize (and always consider the context of the common language runtime), metadata describes all items that are declared or referenced in a module.
I prefer to remove the content of this method, which means, transforming the method Form1_Load() to a method that does nothing!
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