![]() ![]() If we program something, you should be able to compile and save symbols in a file with the pdb extension.Īt the moment, your symbols folder is most likely empty now. ![]() This should happen for most of the system binary files. When you installed Windbg you should have configured a folder for symbols where symbols will be downloaded automatically. Static reversing also depends on if the programs contain symbols. We have to master and gain expertise of all the techniques for later use and to combine them as best as possible to meet our goals. In general, static reversing is a powerful technique when mastered and helps us to find a correct path to the wanted function, and it can sometimes complement dynamic reversing. There are some disassembler programs that are interactive, so those not only show the functions and instructions but allow us (according to reversing experts) detection functionality of each one and working with what we’ll see it is the static reversing. We don’t even know how to reach some program functions, which could require testing thousands of combinations in order access the function, making the work far too time consuming.Īntonio Rodriguez of Incibe explains binary diffing as follows:Īs part of the training, there will be a few exercises of binary diffing to find patches. To examine all the changes individually to uncover which one is responsible for the fix requires so much complex analysis and debugging that it’s simply unfeasible. Most of them are little fixes, new functionalities, or minor changes only. The problem with this approach is that there could be hundreds of changed functions and not all of them are patches. This the exact stage of the vulnerability to start developing an exploit. ![]() A diff is when we use a tool to compare the vulnerable version with the patched one to figure out if and how the patch solved the issue. In the case of exploit writers, when they analyze a program patch that fixes a program vulnerability, they usually do something called binary diffing or diff. Static analysis can typically be used in malware analysis, function analysis of programs that don’t run, research of vulnerabilities, code reconstruction and more. ![]() A static analysis would be enough, getting conclusions without running the application or running the minimum possible amount. But even when a tool like this is easy to use, there are many cases where it’s not necessary to run the program. In those tools we’re not only running the program, we can also reach the function to analyze and execute it. In part two of this series, we learned to solve the exercise stack1 using 圆4dbg, debugging tool that allows us to analyze a program by running it, tracing it, even allowing us to set breakpoints, etc. ![]()
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January 2023
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