Operating Systems in .NET

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Operating Systems
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An operating system is a program that manages the computer, including the hardware and software applications. An operating system takes care of many different tasks and can be seen as a kind of coordinator between the different elements in a computer. Operating systems are such a key element in a computer that any reverser must have a good understanding of what they do and how they work. As we ll see later on, many reversing techniques revolve around the operating system because the operating system serves as a gatekeeper that controls the link between applications and the outside world. 3 provides an introduction to modern operating system architectures and operating system internals, and demonstrates the connection between operating systems and reverse-engineering techniques.
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The Reversing Process
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How does one begin reversing There are really many different approaches that work, and I ll try to discuss as many of them as possible throughout this book. For starters, I usually try to divide reversing sessions into two separate phases. The first, which is really a kind of large-scale observation of the earlier program, is called system-level reversing. System-level reversing techniques help determine the general structure of the program and sometimes even locate areas of interest within it. Once you establish a general understanding of the layout of the program and determine areas of special interest within it you can proceed to more in-depth work using code-level reversing techniques. Codelevel techniques provide detailed information on a selected code chunk. The following sections describe each of the two techniques.
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System-Level Reversing
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System-level reversing involves running various tools on the program and utilizing various operating system services to obtain information, inspect program executables, track program input and output, and so forth. Most of this information comes from the operating system, because by definition every interaction that a program has with the outside world must go through the operating system. This is the reason why reversers must understand operating systems they can be used during reversing sessions to obtain a wealth of information about the target program being investigated. I will be discussing operating system basics in 3 and proceed to introduce the various tools commonly used for system-level reversing in 4.
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Code-Level Reversing
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Code-level reversing is really an art form. Extracting design concepts and algorithms from a program binary is a complex process that requires a mastery of reversing techniques along with a solid understanding of software development, the CPU, and the operating system. Software can be highly complex, and even those with access to a program s well-written and properly-documented source code are often amazed at how difficult it can be to comprehend. Deciphering the sequences of low-level instructions that make up a program is usually no mean feat. But fear not, the focus of this book is to provide you with the knowledge, tools, and techniques needed to perform effective code-level reversing. Before covering any actual techniques, you must become familiar with some software-engineering essentials. Code-level reversing observes the code from a very low-level, and we ll be seeing every little detail of how the software operates. Many of these details are generated automatically by the compiler and not manually by the software developer, which sometimes makes it difficult to understand how they relate to the program and to its functionality. That is why reversing requires a solid understanding of the low-level aspects of software, including the link between high-level and low-level programming constructs, assembly language, and the inner workings of compilers. These topics are discussed in 2.
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The Tools
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Reversing is all about the tools. The following sections describe the basic categories of tools that are used in reverse engineering. Many of these tools were not specifically created as reversing tools, but can be quite useful nonetheless. 4 provides an in-depth discussion of the various types of tools and
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