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How to Reverse Engineer with IDA Pro Disassembler Part1

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Local Jobs Salary Estimator. However, we first decompile or dissemble the binary using IDA Pro in order to comprehend what mechanics are implemented implicitly. Thus, launch the IDA Pro software, and it will ask to choose the prototype of a new disassemble file:.

After configuring the disassemble prototype as a new project, the IDA prompts to open the target binary as in the following figure. These file types basically point out the platform on which they were developed.


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In our scenario, the PE file is best fit-in because we have chosen a Windows 32 console application as per the figure 1. Finally, click OK. On the whole, much internal processing is done before opening a target file. It provides a drag-able and moveable dashed rectangle box which can let us reach anywhere in the code execution.


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In the BLUE BOX, it shows the decompile code in assembly code format and most importantly, we can access any segment of code such as entry point, containing text string, binary pattern and marked position just by dragging the pointer in the first RED BOX. The important point to note here is that the Debugger menu would only be visible if the target file has the correct PE signature; otherwise it remains invisible. We shall accomplish the task of logic tracing by debugging the decompiled file. We however choose the appropriate debugger. In our case, we pick Local Win32 debugger as follows:.

After ensuring the mandatory configuration, it is time to correlate with the actual mechanism by using the arrow mentioned in the following figure 1. The alert string message mentioned in figure 1. In fact, this target file shows numerous execution paths, and some of them are useful in the context of reversing, and the remaining ones are useless.

After moving the pointer to a specific location, we can find the actual mechanism logic flow as following. It typically shows the control flow when we enter the wrong password value.

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The logic path flow mentioned in the aforesaid figure usually does not fit in the work area window. For this purpose, we can move the dashed rectangle in the graph overview by dragging it to reach a specific segment as follows:. After moving the pointer to the appropriate location, we have found the decompiled code in assembly language format.

Here, we can easily assume that this program prompts the user to enter the password by the scanf method mentioned in the RED BOX. Then this value is compared to a predefined string value which is password using the strcmp method. The test eax register is holding the value 0 or 1 which would come based on the string comparison.

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Finally, the jnz instructs the compiler to directly jump to the false segment branching, which is location If the eax register contains the value 0, then the condition would be true and the code execution directed to the box highlighted by cyan color. If it has a value of 1, then the control flow diverts toward the false condition block as follows:.

As we have stated earlier, the code flow instructions are huge in quantity, so we have to move the dashed rectangle from time to time in order to reach the specific code block. This time we move to a false condition block as follows:. Finally, no matter what value the eax register holds, the compiler always executes the following assembly instruction, where the getch method is encountered every time as follows:.

So, we have successfully disassembled the target assembly code to correlate to the actual mechanism running behind the scenes. We have come to a conclusion that the eax register value is the key hack. If its value is 0, then we entered into the true condition code block; otherwise we entered into the false condition block. So, the eax register value would be the key interest for the reverser to subvert the password mechanism.

If we change that value manually during debugging, then we can reach the true condition block even if we enter the wrong password information. To do so, run this application in debugging mode. However, place a breackpoint at eax instruction by using F2. The instruction would be submerged in red box as follows:. Then, run this executable by Start Process F9 from Debugger.

Again, a couple of windows appeared, then disappeared as usual. After that, the target starts to execute in DoS mode, because it is a console application. Reverse engineering is the process of analyzing hardware or software and understanding it, without having access to the source code or design documents.

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Hackers are able to reverse engineer systems and exploit what they find with scary results. Now the good guys can use the same tools to thwart these threats. Practical Reverse Engineering goes under the hood of reverse engineering for security analysts, security engineers, and system programmers, so they can learn how to use these same processes to stop hackers in their tracks. The book covers x86, x64, and ARM the first book to cover all three ; Windows kernel-mode code rootkits and drivers; virtual machine protection techniques; and much more.

Best of all, it offers a systematic approach to the material, with plenty of hands-on exercises and real-world examples.

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Beginning with a basic primer on reverse engineering-including computer internals, operating systems, and assembly language-and then discussing the various. The book is broken into two parts, the first deals with security-related reverse engineering and the second explores the more practical aspects of reverse engineering. Malware analysis is big business, and attacks can cost a company dearly. When malware breaches your defenses, you need to act quickly to cure current infections and prevent future ones from occurring.

Hands-on labs throughout the book challenge you to practice and synthesize your skills as you dissect real malware samples, and pages of detailed dissections offer an over-the-shoulder look at how the pros do it. Malware analysis is a cat-and-mouse game with rules that are constantly changing, so make sure you have the fundamentals.