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Anti-debugging is a popular anti-analysis technique used by malware to recognize when it is under the control of a debugger or to thwart debuggers. Malware authors know that malware analysts use debuggers to figure out how malware operates, and the authors use anti-debugging techniques in an attempt to slow down the analyst as much as possible. Once malware realizes that it is running in a debugger, it may alter its normal code execution path or modify the code to cause a crash, thus interfering with the analysts’ attempts to understand it, and adding time and additional overhead to their efforts.
There are many anti-debugging techniques—perhaps hundreds of them—and we’ll discuss only the most popular ones that we have encountered in the real world. We will present ways to bypass anti-debugging techniques, but our overall goal in this chapter (besides introducing you to specific techniques) is to help you to develop the skills that you’ll need to overcome new and previously unknown anti-debugging methods during analysis.
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