Yara Based Detection Engine for web browsers

Related tags

Security related resourcesYobi
Overview

Yobi

Yara Based Detection for web browsers

System Requirements

Yobi requires python3 and and right now supports only firefox and other Gecko-based browsers.

Installation

Automatic Installation (Linux Only)

git clone https://github.com/imp0rtp3/Yobi/
cd Yobi/
chmod +x install.sh
./install.sh

Manual Installation

  1. Run:
git clone https://github.com/imp0rtp3/Yobi/
cd Yobi/
pip install -r requirements.txt
# Create certificate and key used for the WSS communicaitons
openssl req -x509 -batch -newkey rsa:4096 -keyout key.pem -out cert.pem -days 365 -nodes 
python3 setup_cert.py
  1. Open Firefox and type in the address bar https://127.0.0.1:8392. Click "Advanced"-> "Accept the Risk and Continue"
  2. open https://addons.mozilla.org/firefox/downloads/file/3831405/yobi-0.0.1-fx.xpi to install the Yobi add-on signed by mozilla.

Running

  1. run python3 main.py

YARA rules

YARA rules are fetched from a repository of JS rules I created: js-yara-rules. The repo consists of free JS rules I found on the internet and some I wrote myself. Feel free to create pull requests for additional rellevant rules. The repository can be changed in config.py

Additionally, you can add your own rules by setting USE_CUSTOM_RULES=True and CUSTOM_RULES_PATH to a path containing your yara rules in config.py.

Yobi's Inner Workings

Yobi is separated into two components - a browser extension and a python script. They communicate through WSS protocol. Self-signed certificates need to be created in order for the protocol to function. The alternative of using the unencrypted websocket protocol would allow anyone intercepting loopback traffic to intercept decrypted https content of the browsetr.

Why not run everything in the browser?

I am not aware of any maintained Yara engine able to run in the browser, through webassembly or JS.

Continuing Development

This version is still very basic and should serve as a prototype only. Please open issues and pull request for new features or bugs you encounter.

Contact and Feedback

Contact me via twitter - @imp0rtp3

Screenshots

Yobi alerts Dashboard

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Comments
  • accidentally created a web-based scanner

    accidentally created a web-based scanner

    Thanks for creating yobi, after some time I finally found a good usage example for libyara-wasm.

    As the license states and for others I will release the sourcecode of my own web-based scanner with modified code and a small set of my own rules.

    Bildschirmfoto 2021-09-04 um 23 03 30
    opened by DanielRuf 0
Releases(v0.1.1)
Owner
imp0rtp3
imp0rtp3
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