Statically linked Library detector
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input
sample_code
screenshots
LICENSE
README.md
function_compare.py
rename.py
save_disasm.py

README.md

slid

  • All sample code is in the sample_code folder

  • All screenshots are in the screenshots folder

  • All code was tested on IDA PRO 6.4 on Windows 7. All commands are to be run from the Windows CMD prompt

  • Sample code was compiled on Ubuntu 12.04 and gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)

  • Get a list of all the functions and their instructions for the binary you want to reverse as well as all the libraries that you think may be part of it. Before running this script, make sure you have the binary you want to reverse as well as all the libraries you think are a part of the binary in the "C:\data\IDBstore" directory.

    For the code I used I put the test binary as well as all the files from the libc.a archive into the directory "C:\data\IDBstore". The libc.a archive was found on my system at /usr/lib/x86_64-linux-gnu/libc.a. The files from this archive can be extracted by using the command ar x /usr/lib/x86_64-linux-gnu/libc.a

    FOR %x IN ("C:\data\IDBstore*") do idaw64 -A -L"C:\data\log.txt" -S"C:\data\save_disasm.py" "%x"

    The result of running this script will store the disassembly of the binary to be reversed and a lot of the associated libraries in a folder called input.

    Look at 01.png for the result of this script.

  • Compare functions of the binary with the functions of all the libraries. In the example below, the output of the statically linked binary is test_mnem.txt. The -m option compares only the mnemonics of all the functions.

    python function_compare.py test_mnem.txt -m

    The result of running this script will be stored in a new file called input_to_rename_function.txt.

    Look at 02.png for the result of this script.

  • Use the output obtained from the previous script to accordingly rename functions inside IDA.

    Look at 03.png and 04.png before running this script. The line numbers show the starting (1039) and ending line numbers(1159) for sub_ functions. This means there are 120 functions.

    05.png is a screenshot that shows how to run this script.

    idaw64 -A -L""C:\data\log.txt" -S"C:\data\rename.py" test

    The result of running this script is that all the functions that started with sub_ inside the binary to be reversed AND found a match with some library somewhere will be renamed. Open up the saved IDB as usual - you will see that a number of functions have been renamed.

    Look at 06.png and 07.png for the result of this script. The line numbers show the starting (1120) and ending line numbers(1159) for sub_ functions. This means that there are now 39 functions. This means that 81 functions were renamed because they matched some function inside libc.a.

    Look at 08.png and 09.png for examples of how the names of the functions look once they have been renamed. The functions whose names start with single are named because only a single match was found in libc.a. The functions whose names start with multiple are named because multiple matches were found in libc.a.