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EXTENSION_CONTROL_BLOCK pointer. You just make sure to overwrite the exception handler pointer, and when the function crashes the system will call the function to handle the exception. There is one other problem with exploiting this code. Remember that whatever is fed into DecodeURLEscapes will be translated into Unicode. This means that the function will add a byte with 0x0 between every byte you send it. How can you possibly construct a usable address for the exception handler in this way It turns out that you don t have to. Among its many talents, DecodeURLEscapes also supports the decoding of hexadecimal digits into binary form, so you can include escape codes such as %u1234 in your URL, and DecodeURLEscapes will write the values right into the target string no Unicode conversion problems!

Security holes can be elusive and hard to define. The fact is that even with source code it can sometimes be difficult to distinguish safe, harmless code from dangerous security vulnerabilities. Still, when you know what type of problems you re looking for and you have certain code areas that you know are high risk, it is definitely possible to estimate whether a given function is safe or not by reversing it. All it takes is an understanding of the system and what makes code safe or unsafe. If you ve never been exposed to the world of security and hacking, I hope that this chapter has served as a good introduction to the topic. Still, this barely scratches the surface. There are thousands of articles online and dozens of books on these subjects. One good place to start is Phrack, the online magazine at www.phrack.org. Phrack is a remarkable resource of attack and exploitation techniques, and offers a wealth of highly technical articles on a variety of hacking-related topics. In any case, I urge you to experiment with these concepts on your own, either by reversing live code from well-known vulnerabilities or by experimenting with your own code.

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Simulations (left = importance sampled)

Malicious software (or malware) is any program that works against the interests of the system s user or owner. Generally speaking, computer users expect the computer and all of the software running on it to work on their behalf. Any program that violates this rule is considered malware, because it works in the interest of other people. Sometimes the distinction can get fuzzy. Imagine what happens when a company CEO decides to spy on all company employees. There are numerous programs available that report all kinds of usage statistics and Web-browsing habits. These can be considered malware because they work against the interest of the system s end user and are often extremely difficult to remove. This chapter introduces the concept of malware and describes the purpose of these programs and how they work. We will be getting into the different types of malware currently in existence, and we ll describe the various techniques they employ in hiding from end users and from antivirus programs. This topic is related to reversing because reversing is the strongest weapon we, the good people, have against creators of malware. Antivirus researchers routinely engage in reversing sessions in order to analyze the latest malicious programs, determine just how dangerous they are, and learn their weaknesses so that effective antivirus programs can be developed. This chapter opens with a general discussion on some basic malware concepts, and proceeds to demonstrate the malware analysis process on real-world malware.

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Figure 17.9 Probability of failure of vertical cut 10 m high evaluated by Monte Carlo simulation with and without importance sampling with different numbers of simulations. Results on the left are importance sampled. Lines span between the smallest and largest values from 10 sets of simulations; line near middle is average of 10 results.

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