May 2015

Suricata EVE JSON format is becoming the de-facto standard for this IDS. All type of events are now exported to this format. The JSON format allows a nice handling of data in external tool like Elasticsearch or even DOM. The output is readable by human but as an event/record can contain a lot of data it can be difficult to do a by-eye analysis when looking at a file. The following screenshot give you an idea of the possible output:

Tailing EVE

Using standard unix tools like grep on the EVE JSON file is not the perfect idea. For example if you want to extract a field to get some statistics you may want to try using grep, cut or awk but you may find it painful. And it is worthed to mention here that JSON fields are not ordered.

Here to the rescue comes the jq utility. jq is a tool dedicated to the transformation/parsing of a JSON entry. It is Debian packaged, so a simple apt-get install jq is enough for the install.

Some jq examples

The most basic usage is to colorize the entry. To do that, just do something like

$ tail -n100 eve.json| jq '.'

The output is done the pretty way:
JQ displaying an event
To get a one line per event output, just add the -c flag to the command:
One line

To extract a single field from the JSON events, one can do:

$ jq '.src_ip' eve.json

The point to remember is that the point in .src_ip is a place holder for the current entry.

By default when a field is not present null is displayed in the output. To fix that, it is possible to filter the event to only get the one we are interested in. This is done via the select keyword. For instance to select the SSH events and extract the information about the client part one can do:

$ tail eve.json | jq -c 'select(.event_type == "ssh")|.ssh.client'

Far more things can be done with jq. Good starting points are the jq manual and wiki.


Stamus Networks is proud to announce the availability of SELKS 2.0  release.

SELKS is both Live and installable Network Security Management ISO based on Debian implementing and focusing on a complete and ready to use Suricata IDS/IPS ecosystem with its own graphic rule manager. Stamus Networks is a proud member of the Open Source community and SELKS is released under GPLv3 license.

This is a major SELKS upgrade.

New Features

  • Debian Jessie based  – With Debian Jessie  being released last week  – 25 April   SELKS makes the switch as well (from Debian Wheezy and 3.2 kernel). The new Debian release Jessie will enable SELKS for much better HW compatibility, new kernel 3.16 and all the performance improvements, features and benefits with it right out of the box.
  • Elasticsearch 1.5  – upgrade from 1.4
  • Scirius 1.0 – upgrade from 1.0rc3


Some screenshot examples



Screenshot from 2015-04-20 22:07:08

IDS/IPS dashboards

12 ready to use IDS/IPS dashboards


By VLAN break down File Transactions/SSH


By VLAN break down DNS/TLS


By file attachment breakdown SMTP


By VLAN break down Alerts/HTTP


For those that use SELKS 1.2 and would like to do an in place upgrade to SELKS 2.0 you can follow THIS GUIDE.

NOTE: Please make sure that you test the upgrade in your test/QA environment first before doing it on your production systems.

Please note that default login/password for HTTPS access (Dashboards or Scirius icons) is selks-user/selks-user.

More about SELKS 2.0