Doug Burks edited this page Oct 1, 2018 · 2 revisions

Introduction

Wazuh has replaced OSSEC:
https://blog.securityonion.net/2018/10/wazuh-361-elastic-641-and-associated.html

This page is based on the original OSSEC page:
https://github.com/Security-Onion-Solutions/security-onion/wiki/OSSEC

Description

From http://ossec.github.io/:

OSSEC watches it all, actively monitoring all aspects of system activity with file integrity monitoring, log monitoring, rootcheck, and process monitoring.

Security Onion Usage

Security Onion uses Wazuh as a Host Intrusion Detection System (HIDS). Wazuh is monitoring and defending Security Onion itself and you can add Wazuh agents to monitor other hosts on your network as well.

Additionally, you may want to:

For more information about Wazuh, please see:
https://documentation.wazuh.com/current/index.html

Active Response

Sometimes, Wazuh may recognize legitimate activity as potentially malicious, and engage in Active Response to block a connection. This may result in unintended consequences and/or blacklisting of trusted IPs. You can whitelist your IP address and change other settings in /var/ossec/etc/ossec.conf to prevent this from occurring:

<global>
<white_list>desired_ip</white_list>
</global>

Tuning Rules

You can add new rules and modify existing rules in /var/ossec/rules/local_rules.xml.

Wazuh alerts of a level of 5 or greater will be populated in the Sguil database, and viewable via Sguil and/or Squert. If you would like to change the level for which alerts are sent to sguild, you can modify the value for OSSEC_AGENT_LEVEL in /etc/nsm/securityonion.conf and restart NSM services.

Adding Agents

The Wazuh agent is cross platform and you can download agents for Windows/Unix/Linux/FreeBSD from the Wazuh website: https://documentation.wazuh.com/current/installation-guide/packages-list/index.html

Once you've installed the Wazuh agent on the host(s) to be monitored, then perform the steps defined here:
http://ossec-docs.readthedocs.org/en/latest/manual/agent/agent-management.html#managing-agents

You may need to run so-allow to allow traffic from the IP address of your Wazuh agent(s).

Maximum Number of Agents

Security Onion is configured to support a maximum number of 14000 Wazuh agents reporting to a single Wazuh manager.

Automated Deployment

Wazuh includes ossec-authd:
https://documentation.wazuh.com/current/user-manual/reference/daemons/ossec-authd.html

Downloads

You can download Wazuh agents here:
https://documentation.wazuh.com/current/installation-guide/packages-list/index.html

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