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Back in the early oughts, a common complaint about Linux was that while it was free/libre, it came with no support and you had to pay expensive senior sysadmins to run Linux systems. Fast forward to today, and Linux has conquered basically every field except for the desktop market. Then connect the cable from the LAN side of your Firewall into the switch and mirror all the traffic to another port that the SO Server is connected to. You should inspect and manage the events in Sguil everyday, its database doesn’t grow too big.
If any of those alerts or logs look interesting, you might want to pivot to PCAP to review the full packet capture for the entire stream. With all of the data sources mentioned above, there is an incredible amount of data available at your fingertips. Fortunately, Security Onion tightly integrates the following tools to help make sense of this data.
Top Security attacks than can target your network
At the end, we should have seen something like this.Now we are pretty much all set up. We can access our Kibana interface and see everything that is coming through our network now. Escalate alerts and logs to Cases and document any observables. Pivot to Hunt to cast a wider net for those observables.
Security Onion includes a native web interface with built-in tools analysts use to respond to alerts, hunt for evil, catalog evidence into cases, monitor grid performance, and much more. Additionally, third-party tools, such as Elasticsearch, Logstash, Kibana, Suricata, Zeek , Wazuh, Stenographer, CyberChef, NetworkMiner, and many more are included. Many folks have asked for a printed version of our official online documentation and we're excited to provide that! Whether you work on airgap networks or simply want a portable reference that doesn't require an Internet connection or batteries, this is what you've been asking for. If nothing else, spinning up a test deployment of Security Onion is a great way to have something to benchmark against when evaluating those six-figure-per-seat-per-year solutions. Security Onion is under active development, and their public roadmap includes a move away from Debian package deployment to using Docker to support RHEL/CentOS systems more easily.
Security Onion Links
If this occurs, interrupt the installation and then follow the instructions from a previous post we recently published explaininghow to fix that problem. # options here, or by using the `-setup` CLI flag or the `setup` command. Once everything is selected hit the Flash buttonAfter this step is done we just need to install the drive back into our computer and power it on. If everything worked correctly you should be booting into Security Onion and you can begin the setup process. For a dedicated computer solution you’re going to want to start with downloading the Security Onion ISO. Once this is complete we’re going to flash this data to our HHD/SSD. Before we get started, it is important that you have the capability to create a SPAN port on your local network.
It gives you an inside view of what is going on across your network. A security professional who understands how to interpret event analysis could gain benefit from Security Onion. If you use the Security Onion outputs with your enterprise SIEM system, you would have a useful view of network security events. Official SO WIKIis very impressive and comprehensive. Therefore this guide has been created mainly to extract and present some key information on installing and running SO in a different light, maybe in a more layman's way. It also combines information from many different sources, hoping to save time for the reader who may be faced with some similar hurdles as the author faced when setting up SO the first time.
Setting up Security Onion at home
We can take this a step further and forward our Windows event logs to our Security Onion machine automagically! This can be done with a combination of Sysmon and Winlogbeat. We’re going to install both Sysmon and Winlogbeat on any/all Windows machines on our network that we wish to monitor. This interface will be used to hit the web consoleThe setup will then ask whether or not you’d like a static IP vs one assigned via DHCP. The setup suggests a static IP, this is because that IP will always be reserved for this device instead of DHCP where the IP can change based on how our network is set up. We’ll set this up with a static IP of , a netmask of and a gateway of .
If anyone has managed to do that, we would love to hear from you! And yes, we did play with DD-WRT/Tomato, iptables, mangle rule, etc. Available here, where Doug Burks himself seems to be spending a lot of his time answering questions very quickly and always being very helpful. Please note this guide was written with a Home Network in mind, with only one instance of SO running within a VM and therefore not using any nodes. Some information are still relevant to a commercial environment but the basic SO and Network configuration section would be different. Once you’ve found something that you want to investigate, you might want to pivot to Hunt to expand your search and look for additional logs relating to the source and destination IP addresses.
How does Security Onion work?
Your settings can be different based off of your network. Here is our virtual switch which allows for promiscuous mode. This enables us to create a SPAN port.Once our switch is created, we need to create a port group. We add a new group and assign it to the virtual switch we created in the previous step. As you are working in Alerts, Dashboards, or Hunt, you may find alerts or logs that are interesting enough to send to Cases and create a case. Other analysts can collaborate with you as you work to close that case.
Finally, most users configure the Wazuh agent using the Wazuh Agent Manager which sets the permissions correctly. The big challenge in SOCs today, though, is an avalanche of false positives. Sniffing all the things on your networks and devices is feasible using Security Onion. Will your SOC be able to survive the false positive rate? That's a question that enterprise security teams will have to consider carefully before deciding to deploy Security Onion in a busy and alert-noisy production environment.
Security Onion generates NIDS alerts by monitoring your network traffic and looking for specific fingerprints and identifiers that match known malicious, anomalous, or otherwise suspicious traffic. This is signature-based detection so you might say that it’s similar to antivirus signatures for the network, but it’s a bit deeper and more flexible than that. From a network visibility standpoint, Security Onion seamlessly weaves together intrusion detection, network metadata, full packet capture, file analysis, and intrusion detection honeypots. After this, we will enable our sniffing interface, this is the interface which is connected to our SPAN port. If you only have two NICs then there should only be one device left to choose.
My two networks include four PCs with Windows'/Linuxs/FreeBSD, pfSense FW, DD-WRT router, three switches , FreeNAS, three IP cameras, two phones and smart TV. I'm eager to implement Security Onion in my home network for security network monitoring, but having hard time to find suitable hardware. You can also add an IP to hostname mapping at the OS level, this may be useful with etherape and other network tools.
Feel free to create whatever username you wishOnce we confirm these are the settings that we wish, the system will go about configuring everything for us. This process can take a bit of time, so feel free to grab a coffee or something. Now we need to allow access to our management network so we can access it outside of the security onion machine. Many assume NSM is a solution they can buy to fill a gap; purchase and deploy solution XYZ and problem solved. The belief that you can buy an NSM denies the fact that the most important word in the NSM acronym is “M” for Monitoring. Data can be collected and analyzed, but not all malicious activity looks malicious at first glance.
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