REcover is a tool for approximately recovering the compile-unit layout from stripped binary executables. REcover consists of an IDAPython plug-in, used for exporting information, and a command line tool, for running various analyses.

1. Create and activate a new virtual environment:

    $ python -m venv /tmp/recover-venv
    $ . /tmp/recover-venv/bin/activate
   

2. Clone and install REcover and its dependencies:

    $ cd /tmp
    $ git clone --recurse-submodules https://github.com/huku-/recover.git
    $ cd recover
    $ pip install -r .
   

3. Make sure everything works as expected:

    $ recover -h
   

4. Additionally, you can install the experimental IDA Pro plug-in. Find source code here and instructions here.

Let's analyze ELF binary sha256sum from coreutils-7.6-O3 of the DeepBinDiff dataset:

$ ls -la /tmp/example/sha256sum
-rwxr-x--- 1 huku huku 239696 Jun  4 18:57 /tmp/example/sha256sum
$ file /tmp/example/sha256sum
/tmp/example/sha256sum: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=c08bcb9aede425a19d263c5e5d9c55b8f9f63701, with debug_info, not stripped

Even though the above executable comes with debug information (i.e. it's not actually stripped), the latter is not used by REcover when estimating the compile-unit layout.

Fire up IDA Pro and run the REcover exporter. Either navigate to File → Script file... and choose main.py or run the following command:

RECOVER_EXIT=1 ida64 -A -S/tmp/recover/src/recover/main.py \
    /tmp/example/sha256sum

When the process exits, the following files should have been created in the same directory where the ELF executable resides:

$ ls -la /tmp/example/*.pcl
-rw-r--r-- 1 huku huku 34817 Jun  4 22:35 /tmp/example/afcg.pcl
-rw-r--r-- 1 huku huku 35010 Jun  4 22:35 /tmp/example/dfg.pcl
-rw-r--r-- 1 huku huku 60956 Jun  4 22:35 /tmp/example/pdg.pcl
-rw-r--r-- 1 huku huku  1354 Jun  4 22:35 /tmp/example/segs.pcl

To run an actual compile-unit estimation analysis, use recover from the command line as shown below:

$ recover --estimator agglnse \
    --fitness-function modularity \
    --optimizer brute \
    -k /tmp/example/estimated_cu_map.pcl \
    -j /tmp/example/estimated_cu_map.json \
    --debug \
    /tmp/example

There is a variety of estimators (--estimator), fitness functions (--fitness-function) and optimizers (--optimizer) to choose from. See recover -h for more information.

• See Extending REcover for more information on how to extend REcover.

• Complete API reference is on the way!

@article{karamitas2025,
    title={REcover: towards recovering object files from stripped binary executables},
    author={Karamitas, Chariton and Kehagias, Athanasios},
    journal={Journal of Computer Virology and Hacking Techniques},
    volume={21},
    number={1},
    pages={29},
    year={2025},
    publisher={Springer}
}