Cheatsheets and example scripts for IDAPython (7.x and 6.x).

So, using the IDAPython API to search for all instances of `rep movsd` followed by `rep movsb` 7 bytes after it gives us the following code snippet: If we run this against the EQNEDT32.exe, then we get the following output in IDA Pro: If we begin to look at all of the instances where the script reports detected instances of inlined strcpy we find several instances where this script picks up other functions that are not strcpy but are similar. When IDA 7 was released, it came with a large number of changes to the API that were not backwards compatible.

You can vote up the examples you like or vote down the ones you don't like. Now that we understand how the compiler optimized strcpy function calls we are able to enhance our vulnerability hunting scripts to allow us to find instances where they an inlined strcpy occurs. Converted format from Markdown to Microsoft Word.

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They are from open source Python projects. Figure 2 High number of references to suspect function As we can see in figure 2, there are 116 instances where this particular function is called.

In the above screenshot we can observe that the decompiler output on the right side shows that a call to strcpy in made, but when we look to the left side disassembly there is not a corresponding call to strcpy. Example of inlined strcpy() - Disassembly on left, HexRays decompiled version on right. In Example 15-8, we reimplement the function enumeration script of Example 15-1 in Python. and idapython_hr-examples test suites.) The Equation Editor application makes a great example program since it was until very recently, a widely distributed real-world application that we are able to use to test our IDAPython scripts. Get The IDA Pro Book, 2nd Edition now with O’Reilly online learning. It looks like this: Printable versions PDF. Enumerations can be a powerful mechanism when faced with such a problem. While reverse-engineering a malicious sample, I encountered the following function: Figure 1 String decryption function Based on experience, I suspected this might be used to decrypt data contained in the binary. The price of the ebook is free (move the slider to left) but has a suggested price of $24.99.

with one or many examples, and those should be also put under test They are excellent sources for learning but they don't cover some common issues that I have come across. Leanpub is copyright © 2010-2020 Ruboss Technology Corp. All rights reserved. When looking for inlined string functions, a common feature of the inlined assembly to watch for is the use of the “repeat” assembly instructions (rep, repnz, repz) in performing the string operations. This instruction is commonly used to get the length of a string (and is often used when strlen() is inlined by the compiler). We promise. To learn more about our use of cookies see our Privacy Statement. Recall that the purpose of this script is to iterate over every function in a database and print basic information about each function, including ... Take O’Reilly online learning with you and learn anywhere, anytime on your phone and tablet. they're used to log you in.

Let us take a look at an IDA Pro screenshot below that shows the disassembly view side-by-side with the HexRays decompiler output of an instance where a call to strcpy is inlined. that this ensures our APIs remain stable. Best Practices, code samples, and documentation for Computer Vision. Overview. They are excellent sources for learning but they don't cover some common issues that I have come across. Usually I will point them to to Ero Carrera's Introduction to IDAPython or the example scripts in the IDAPython's public repo. test as well. The vulnerability that will be discussed is a remote code execution vulnerability that existed in the Microsoft Office EQNEDT32.exe component which was also known as the Microsoft Office Equation Editor. I work as a reverse engineer and malware analyst. In order to help us do this, we will use the IDAPython API and the search functionality that it provides us with. By way of offering a compare and contrast between IDC and IDAPython, the following sections present the same example cases seen previously in the discussion of IDC. We use cookies and similar technologies ("cookies") to provide and secure our websites, as well as to analyze the usage of our websites, in order to offer you a great user experience. nkaretnikov / break.py. Playing with API Implementations with IDA and Bochs, IDAPython: User Scripting for a Complex Application. Now in order to properly handle the IDA 7 API, in the catch block for the we must pass an additional “instruction” argument to the get_stkvar() call as well as perform a check on the value of inst[idx].addr. These vulnerabilities include: CVE-2018-0802, CVE-2018-0804, CVE-2018-0805, CVE-2018-0806, CVE-2018-0807, CVE-2018-0845, and CVE-2018-0862. To do this we check to see if the signed bit of the value is set and, if it is, then we convert it to the proper negative representation using two’s complement. Software Architecture for Developers: Volumes 1 & 2 - Technical leadership and communication, CCIE Service Provider Ultimate Study Bundle. This bug has been reported to the Hex-Rays team but, as of when this was written, has not been patched and requires us to convert negative numbers into the correct Python representation prior to passing them to the function. since that body of code should be tested anyway, it's better to make

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