OSSEC is sometimes described as a low-cost log management solution but it has many interesting features which, when combined with external sources of information, may help in hunting for suspicious activity occurring on your servers and end-points. During this workshop, you will learn the basic of OSSEC and its components, how to deploy it and quickly get results. Then I will demonstrate how to deploy specific rules to catch suspicious activities. From an input point of view, we will see how easy it is to learn new log formats to increase the detection scope and, from an output point of view, how we can generate alerts by interconnecting OSSEC with other tools like TheHive or an Elastic Stack/Splunk/etc.