• In-depth Analysis Zeek ships with analyzers for many protocols, enabling high-level semantic analysis at the application layer.

• Adaptable and Flexible Zeek's domain-specific scripting language enables site-specific monitoring policies and means that it is not restricted to any particular detection approach.

• Efficient Zeek targets high-performance networks and is used operationally at a variety of large sites.

• Highly Stateful Zeek keeps extensive application-layer state about the network it monitors and provides a high-level archive of a network's activity.

The best place to find information about getting started with Zeek is our web site www.zeek.org, specifically the documentation section there. On the web site you can also find downloads for stable releases, tutorials on getting Zeek set up, and many other useful resources.

You can find release notes in NEWS and individual changes in the commit history.

To work with the most recent code from the development branch of Zeek, clone the master git repository:

git clone --recursive https://github.com/zeek/zeek

With all dependencies in place, build and install:

./configure && make && sudo make install

Write your first Zeek script:

# File "hello.zeek"

event zeek_init()
    {
    print "Hello World!";
    }

And run it:

zeek hello.zeek

For learning more about the Zeek scripting language, try.zeek.org is a great resource.

Zeek is developed on GitHub by its community. We welcome contributions. Working on an open source project like Zeek can be an incredibly rewarding experience and, packet by packet, makes the Internet a little safer. Today, as a result of countless contributions, Zeek is used operationally around the world by major companies and educational and scientific institutions alike for securing their cyber infrastructure.

If you're interested in getting involved, we collect feature requests and issues on GitHub here and you might find these to be a good place to get started. More information on Zeek's development can be found here, and information about its community and mailing lists (which are fairly active) can be found here.

Zeek comes with a BSD license, allowing for free use with virtually no restrictions. You can find it here.

We use the following tooling to help discover issues to fix, amongst a number of others.

• Clang-Tidy
• Coverity
• PVS-Studio - static analyzer for C, C++, C#, and Java code.