#Ida pro tutorial Patch
Sometimes we want to patch the binary while analyzing it in IDA, but unfortunately the built-in asssembler of IDA Pro is not adequate. Keypatch is confirmed to work on IDA Pro version 6.4, 6.5, 6.6, 6.8, 6.9, 6.95, 7.0, 7.5 but should work flawlessly on older versions.
#Ida pro tutorial how to
See this quick tutorial for how to use Keypatch, and this slides for how it is implemented.
When faced with this type of situation, I typically have a few choices: In each instance where this function is called, a blob of data is being supplied as an argument to this function via the ESI register.įigure 3 Instances where the suspect function (405BF0) is calledĪt this point I am confident that this function is being used by the malware to decrypt strings during runtime. The number of references to this function supported my suspicion.įigure 2 High number of references to suspect functionĪs we can see in figure 2, there are 116 instances where this particular function is called. While reverse-engineering a malicious sample, I encountered the following function:īased on experience, I suspected this might be used to decrypt data contained in the binary. For Part 1 of this series, I’m going to walk through a situation where I was able to write a script to thwart multiple instances of string obfuscation witnessed in a malware sample.
#Ida pro tutorial code
In the hopes of increasing the amount of IDAPython tutorial material available to analysts, I’m providing examples of code I write as interesting use-cases arise. " The Beginner’s Guide to IDAPython” by Alex Hanel.Some exceptions to this include the following: Unfortunately, there’s surprisingly little information in the way of tutorials when it comes to IDAPython. Of course, users also get the added benefit of using Python, which gives them access to the wealth of capabilities that the scripting language provides.
One of the more powerful features of IDA that I implore all reverse engineers to make use of is the Python addition, aptly named ‘IDAPython’, which exposes a large number of IDA API calls. It should come as no surprise, seeing as IDA Pro is the industry standard (although alternatives such as radare2 and Hopper are gaining traction).
As a malware reverse engineer, I often find myself using IDA Pro in my day-to-day activities.