However, it appears most security failures these days are more of detection and response than prevention, and this is where SIEM comes into play. Security is achieved via a combination of prevention, detection, and response efforts. Runs on Docker, Linux, and macOS, or as a virtual appliance.
SIEMonster A competent SIEM for small businesses with a paid version for larger organizations. MozDef A basic SIEM for small businesses that integrates ELK Stack. Apache Metron Data sorting tool with great threat detection but you will need to find a third-party log collector to feed data into it (Hint: Try Logstash). Wazuh A fork of OSSEC that has better logfile management services than the original and relies on ELK. Agents available for Windows, Linux, macOS, and Unix but the server only runs on Linux or Unix. OSSEC This tool has good threat detection routines but weak log management functions so splice it with ELK Stack for the best of breed. ELK Stack A free suite of data collection, sorting, and visualization tools that let you create your own SIEM threat detection rules. AlienVault OSSIM This is one of the oldest SIEM systems around but it is very well supported by AT&T, so it is still being improved on solid, reliable code that has been extensively tested in the field. Here is our list of the seven best free open source SIEM tools: Because a SIEM correlates data from a wide variety of event and contextual data sources, it can enable security teams to identify and respond to suspicious behavior patterns more effectively than would be possible by merely looking at data from individual systems. 
FREE NETFLOW OPEN SOURCE SOFTWARE
Security Information and Event Management ( SIEM) software is a tool that provides a single centralized platform for the collection, monitoring, and management of security-related events and log data from across the enterprise.
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