Security Onion provides multiple IDS options: Network-based and host-based intrusion detection systems (IDS) analyze network traffic or host systems, respectively, and provide log and alert data for detected events and activity. There is certainly valuable evidence to be found on the victim’s body, but evidence at the host can be destroyed or manipulated the camera doesn’t lie, is hard to deceive, and can capture a bullet in transit. It’s a crime scene recorder that can tell us a lot about the victim and the white chalk outline of a compromised host on the ground.
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Full packet capture is like a video camera for your network, but better because not only can it tell us who came and went, but also exactly where they went and what they brought or took with them (exploit payloads, phishing emails, file exfiltration). netsniff-ng captures all the network traffic your Security Onion sensors see and stores as much of it as your storage solution will hold (Security Onion has a built-in mechanism to purge old data before your disks fill to capacity). network-based and host-based intrusion detection systems (NIDS and HIDS, respectively) įull-packet capture is accomplished via netsniff-ng, “the packet sniffing beast”.Security Onion seamlessly weaves together three core functions: Security Onion will provide visibility into your network traffic and context around alerts and anomalous events, but it requires a commitment from you the administrator or analyst to review alerts, monitor the network activity, and most importantly, have a willingness, passion and desire to learn. Nothing is and if that’s what you’re looking for you’ll never find it. Security Onion isn’t a silver bullet that you can setup, walk away from and feel safe. While automation and correlation can enhance intelligence and assist in the process of sorting through false positives and malicious indicators, there is no replacement for human intelligence and awareness. Data can be collected and analyzed, but not all malicious activity looks malicious at first glance. The belief that you can buy an NSM denies the fact that the most important word in the NSM acronym is “M” for Monitoring. Many assume NSM is a solution they can buy to fill a gap purchase and deploy solution XYZ and problem solved. There are some commercial solutions that get close to what Security Onion provides, but very few contain the vast capabilities of Security Onion in one package. Enterprise Security Monitoring (ESM) takes NSM to the next level and includes endpoint visibility and other telemetry from your enterprise. Whether you’re tracking an adversary or trying to keep malware at bay, NSM provides context, intelligence and situational awareness of your network. It might be proactive, when used to identify vulnerabilities or expiring SSL certificates, or it might be reactive, such as in incident response and network forensics. Network Security Monitoring (NSM) is, put simply, monitoring your network for security related events.
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