This section provides background information about the inner workings of BinDiff. Matches functions based on their relaxed MD indices. BinDiff has a list of function attributes hash matching, name matching, etc. After the initial global matching step the parents callers and children callees of each new match are considered. Then follow up by disassembling the patched variant of the file. Of course, the simple strategy above is not complete. Once the two sets of signatures for the two executables have been generated, initial matches are created.


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First version with an external Java based graphical user interface.

On the initial Welcome page, click Next. Algorithms For obvious reasons a byte-by-byte comparison of executables will fail to produce usable output even for most trivial changes.

tools – Bindiff matching algorithm – Reverse Engineering Stack Exchange

The signature consists of:. Port function names, comments and local variable names from one disassembly to another. Source is available here. Displays a graphical representation of the differences between the selected function in the two databases using the BinDiff Graphing GUI.


Thank you for purchasing BinDiffthe leading executable-comparison tool for reverse engineers that need to analyze patches, malware variants, or are generally interested in the differences between two executables. Thomas Dullien and Rolf Rolles. Labelled addresses are now properly displayed. This is often the case when looking at security updates without any changes concerning compiler versions or flags. The copied text is tabular data separated by spaces.

However, I hope to also provide some useful and interesting information for moreexperienced practitioners. Our example will be MS Specified the order of the internal matching algorithms and the associated confidence values.


Second, the two sets of equivalent functions in both binaries must be of equal size. By default, three attributes are used for the matching function number of edges between blocks in the functions, number of returns in the function and the number of basic blocks that make up the function.

You can download BinDiff from the zynamics web site. I’ve started using bindiff recently and struggle to understand matching algorithm. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.


It can also be a calculation of various attributes like the MD-Index that is calculated based on the topology of the graph and the degrees of each basic block or the “functions byte hash” you mention, which is another type of function’s signature.

From time to time, we will publish documents on advanced usage of our products on our website http: Let’s zoom in on the two smaller blocks on the left hand side that have been inserted right before the large red block. Is there a way to export the bindift results, like that of the matched functions window, to a text file or any filetype besides. Bindiff matching algorithm Ask Question.

Number of codeblocks Number of edges between codeblocks Number of calls to subfunctions.

Reverse Engineering Tools Part 1: BinDiff

Matches functions in order based on their entry point addresses. Once the two sets of signatures for the two executables have been generated, initial matches are created. There is not a single matching algorithm but a set of matching algorithms.


Saves the result of the current diffing session to be loaded later using Load Results. Furthermore, a certain program will have the similar CG and CFGs even when compiled with a completely different compiler, for a different operating system and even for another architecture.

Google Online Security Blog: BinDiff now available for free

Because reversing an unknown binary bindigf a time consuming and complex process, tools that simplify the RE process are invaluable when working under time pressure. The user interface for visual diff has been rewritten Call graph views Proximity browsing in flowgraphs and callgraphs New “combined” view of flowgraphs Faster graph rendering and better rendering quality Improved instruction match representation Improved search functionality IDA comments are exported Selection history with undo and redo Copyable basic block and function node contents Multi-tab layout Organize multiple diffs in workspaces New exporter format based on Google Protocol Buffers Incremental diffing – manually confirm matches that will be kept in another diff iteration while reassiging others, allows to iteratively improve the result Auto-generated comments no longer get ported New column in Matched functions table allows to keep track of one’s progress for comment porting Support for the Dalvik architecture used by Android.

There are several bindoff outcomes:. A value of exactly one means the two functions are identical in regard to their instructions, not their memory addresses.

An attribute does not have a match in the other binary.