![]() IDA will suggest to use the first field since it has no offset such as height EAX+4. ![]() ![]() How about the weight ? for the code below Basically IDA will detect that when EAX is MyStruct then EAX + 4 it means it will suggest us field with offset 4 that is height as seen below You can select MyStruct.Weight+4 then the code will be changed to become like this below. ![]() after we defined our struct declaration then we can assign our code to struct by pressing T to the code So based on our observation that our data are integer then dd is good enough 4 Bytes You can change the field name by pressing N.Äd = Defined Double Word 4 Bytes in x86 32 bit systemÄw = Defined Words = Generally 2 bytes on typical x86 32 bits system We can add new struct in IDA by going to struct window and press Ins or right click add struct type struct windowĪ dialog box will appear like below, there you can add new struct name that you want to useĪfter you press OK button, You can see the struct skeleton appear like the picture above In the above code sample in setdata function we can see person is passed variable which is assigned address after EBP. In order to improve our reading, we can define a struct in IDA so that IDA can recognize it.įirst what you need to do is recognize where is the first object initiation. To borrow a license, run the lmborrow utility on the client before running IDA: lmutil lmborrow hexrays time enddate is the date the license is to be returned in dd-mmm-yyyy format.We can see that in the setdata function IDA does not recognize the struct that we defined in C code. Since IDA 7.2, borrowing can be performed directly in IDA (menu Help, Floating Licenses), but you can also use the below procedure. Here is the assembly code main function setdata function We see from the above code that we are using a C struct called bodyType which has two field those are weight and height. In this post, I am going to write about labeling c struct which improve our assembly reading which make easier to do interpretation.
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