Igor’s Tip of the Week #141: Parsing C files

Previosuly, we’ve covered creating structures from C code using the Local Types window, however this may be not very convenient when you have complex types with many dependencies (especially of scattered over several fiels or depending on preprocessor defines). In such case it may be nore convenient to parse the original header file(s) on […]

Igor’s Tip of the Week #137: Processor modes and segment registers

Some of the processors supported by IDA support different ISA variants, in particular: ARM processor module supports the classic 32-bit ARM instructions (A32), 16-bit Thumb or mixed 16/32-bit Thumb32 (T32) , as well as 64-bit A64 instructions (A64) PPC processor module supports the standard 32-bit PowerPC instructions and mixed 16/32-bit Variable Length Environment (VLE) MIPS module supports the […]

Igor’s Tip of the Week #135: Exporting disassembly from IDA

Although most of the time you can probably do all of the reversing inside IDA, occasionally you may need to continue it using other tools. While sometimes it may be enough to analyze the input file with another tool, or use the Export Data feature, the disassembly listing is more convenient in many cases. […]

Igor’s Tip of the Week #133: Alignment items

Sometimes you may see mysterious align keywords in the disassembly, which can appear both in code and data areas: Usually they’re only apparent in the text view. These directives are used by many assemblers to indicate alignment to a specific address boundary, usually a power of two. IDA uses it to replace potentially irrelevant bytes by a […]

Igor’s Tip of the Week #132: Finding “hidden” cross-references

When analyzing firmware or other binaries without metadata, IDA is not always able to discover and analyze all functions which means the cross-references can be missing. Let’s say you found a string in the binary (e.g. in the String list) which has no cross references, but you’re reasonably sure it’s actually used. How to […]

Igor’s Tip of the Week #131: Advanced filters in choosers

 We’ve covered choosers previously and talked about searching, sorting and filtering. The default filter (Ctrl–F shortcut) is pretty simple: it performs case-insensitive match on any column of the list. Advanced filters  Advanced filter dialog is accessible via the context menu entry “Modify filters…” or the shortcut Ctrl–Shift–F In the dialog you can: match any or a specific […]

Igor’s Tip of the Week #128: String list

When exploring an unfamiliar binary, it may be difficult to find interesting places to start from. One common approach is to check what strings are present in the program – this might give some hints about its functionality and maybe some starting places for analysis. While you can scroll through the listing and look at […]

Igor’s Tip of the Week #127: Changing function bounds

When analyzing regular, well-formed binaries, you can usually rely on IDA’s autoanalysis to create functions and detect their boundaries correctly. However, there may be situations when IDA’s guesses need to be adjusted. Non-returning calls One example could be calls to non-returning functions. Let’s say a function has been misdetected by IDA as non-returning: But on further analysis […]