Security Onion Solutions, LLC is the creator and maintainer of Security Onion, a free and open platform for threat hunting, network security monitoring, and log management. There may be entire categories of rules that you want to disable first and then look at the remaining enabled rules to see if there are individual rules that can be disabled. . To generate traffic we are going to use the python library scapy to craft packets with specific information to ensure we trigger the alert with the information we want. jq; so-allow; so-elastic-auth; so . One thing you can do with it (and the one that most people are interested in) is to configure it for IDS mode. Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. These are the files that will need to be changed in order to customize nodes. Syslog-ng and Security Onion We offer both training and support for Security Onion. There are two directories that contain the yaml files for the firewall configuration. Add the following to the sensor minion pillar file located at. It is located at /opt/so/saltstack/local/pillar/global.sls. This can be done in the minion pillar file if you want the delay for just that minion, or it can be done in the global.sls file if it should be applied to all minions. Adding Your Own Rules . You may want to bump the SID into the 90,000,000 range and set the revision to 1. Previously, in the case of an exception, the code would just pass. This will add the host group to, Add the desired IPs to the host group. This first sub-section will discuss network firewalls outside of Security Onion. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. If you would like to pull in NIDS rules from a MISP instance, please see: Integrated into the Security Onion, OSSEC is a host-based intrusion detection system (HIDS) that can conduct file integrity monitoring, local log monitoring, system process monitoring, and rootkit detection. Revision 39f7be52. For example: By default, if you use so-allow to add a host to the syslog hostgroup, that host will only be allowed to connect to the manager node. You can add Wazuh HIDS rules in /opt/so/rules/hids/local_rules.xml. to security-onion yes it is set to 5, I have also played with the alert levels in the rules to see if the number was changing anything. 41 - Network Segmentation, VLANs, and Subnets. To enabled them, either revert the policy by remarking the ips_policy line (and run rule-update), or add the policy type to the rules in local.rules. /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. Please review the Salt section to understand pillars and templates. When configuring network firewalls for distributed deployments, youll want to ensure that nodes can connect as shown below. For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. It is now read-only. In a distributed deployment, the manager node controls all other nodes via salt. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. No rules in /usr/local/lib/snort_dynamicrules - Google Groups (Alternatively, you can press Ctrl+Alt+T to open a new shell.) How to create and monitor your Snort's rules in Security Onion? =========================================================================Top 50 All time Sguil Events=========================================================================Totals GenID:SigID Signature1686 1:1000003 UDP Testing Rule646 1:1000001 ICMP Testing Rule2 1:2019512 ET POLICY Possible IP Check api.ipify.org1 1:2100498 GPL ATTACK_RESPONSE id check returned rootTotal2335, =========================================================================Last update=========================================================================. ManagingAlerts Security-Onion-Solutions/security-onion Wiki - GitHub We created and maintain Security Onion, so we know it better than anybody else. We've been teaching Security Onion classes and providing Professional Services since 2014. You signed in with another tab or window. (Archived 1/22) Tuning NIDS Rules in Security Onion Security Onion 7.5K subscribers 48 Dislike Share 1,465 views Dec 22, 2021 This video has been archived as of January 2022 - the latest. . For example, if ips_policy was set to security, you would add the following to each rule: The whole rule would then look something like: alert tcp any any -> $HOME_NET 7789 (msg: "Vote for Security Onion Toolsmith Tool of 2011! Tracking. To verify the Snort version, type in snort -Vand hit Enter. However, generating custom traffic to test the alert can sometimes be a challenge. Salt minions must be able to connect to the manager node on ports, /opt/so/saltstack/local/pillar/global.sls, /opt/so/saltstack/local/pillar/minions/.sls, https://docs.saltproject.io/en/getstarted/system/communication.html, https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. If you want to tune Wazuh HIDS alerts, please see the Wazuh section. When you purchase products and services from us, you're helping to fund development of Security Onion! Security onion troubleshooting - silvestermallorca.de lawson cedars. Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: sudo vi /opt/so/rules/nids/local.rules Paste the rule. Beta Copyright 2023 These non-manager nodes are referred to as salt minions. For example, to check disk space on all nodes: If you want to force a node to do a full update of all salt states, you can run so-checkin. Run rule-update (this will merge local.rules into downloaded.rules, update. The server is also responsible for ruleset management. How are they stored? Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. If you would like to create a rule yourself and use it with Suricata, this guide might be helpful. Adding Local Rules Security Onion 2.3 documentation Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. How are they parsed? Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. Security Onion Documentation Security Onion 2.3 documentation More information on each of these topics can be found in this section. The reason I have a hub and not a switch is so that all traffic is forwarded to every device connected to it so security onion can see the traffic sent from the attacking kali linux machine, to the windows machines. alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). Then tune your IDS rulesets. A tag already exists with the provided branch name. . In many of the use cases below, we are providing the ability to modify a configuration file by editing either the global or minion pillar file. Salt is a core component of Security Onion 2 as it manages all processes on all nodes. Find Age Regression Discord servers and make new friends! The error can be ignored as it is not an indication of any issue with the minions. > > > > > > > > Cheers, Andi > > > > > > > > > > -- Mit besten Gren Shane Castle > > > > -- > Mit besten Gren > Shane Castle > > -- > You received this message because you are subscribed to a topic in the > Google Groups "security-onion" group. Any line beginning with "#" can be ignored as it is a comment. That's what we'll discuss in this section. You may see the following error in the salt-master log located at /opt/so/log/salt/master: The root cause of this error is a state trying to run on a minion when another state is already running. A node that has a port group and host group association assigned to it will allow those hosts to connect to those ports on that node. PFA local.rules. Revision 39f7be52. Write your rule, see Rules Format and save it. Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. Security Onion. As shown above, we edit the minion pillar and add the SID to the idstools - sids - disabled section. . 3. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. If you built the rule correctly, then snort should be back up and running. There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). The durian (/ d r i n /, / dj r i n /) is the edible fruit of several tree species belonging to the genus Durio.There are 30 recognised Durio species, at least nine of which produce edible fruit. Then tune your IDS rulesets. For example, the following threshold IP exceeds the 64-character limit: This results in the following error in the Suricata log: The solution is to break the ip field into multiple entries like this: A suppression rule allows you to make some finer grained decisions about certain rules without the onus of rewriting them. Integrating Snort 3.0 (SnortSP) and Sguil in 3 Steps - Security Onion Use one of the following examples in your console/terminal window: sudo nano local.rules sudo vim local.rules. For more information about Salt, please see https://docs.saltstack.com/en/latest/. Set anywhere from 5 to 12 in the local_rules Kevin. From the Command Line. 'Re: [security-onion] Rule still triggering even after modifying to Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you don't want your network sensors to process. Inside of /opt/so/saltstack/local/salt/strelka/rules/localrules, add your YARA rules. Escalate local privileges to root level. In the image below, we can see how we define some rules for an eval node. /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml defines custom port groups. Check out our NIDS tuning video at https://youtu.be/1jEkFIEUCuI! However, generating custom traffic to test the alert can sometimes be a challenge. Revision 39f7be52. Generate some traffic to trigger the alert. The easiest way to test that our NIDS is working as expected might be to simply access http://testmynids.org/uid/index.html from a machine that is being monitored by Security Onion. Revision 39f7be52. If we want to allow a host or group of hosts to send syslog to a sensor, then we can do the following: In this example, we will be extending the default nginx port group to include port 8086 for a standalone node. > To unsubscribe from this topic . Have you tried something like this, in case you are not getting traffic to $HOME_NET? Enter the following sample in a line at a time. This wiki is no longer maintained. . Please note! Important "Security Onion" Files and Directories - Medium Security Onion: June 2013 Manager of Support and Professional Services. and dont forget that the end is a semicolon and not a colon. You may want to bump the SID into the 90,000,000 range and set the revision to 1. The second only needs the $ character escaped to prevent bash from treating that as a variable. For example, consider the following rules that reference the ET.MSSQL flowbit. It's simple enough to run in small environments without many issues and allows advanced users to deploy distributed systems that can be used in network enterprise type environments. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. To unsubscribe from this group and stop receiving emails from it, send an email to security-onio.@googlegroups.com. For example: In some cases, you may not want to use the modify option above, but instead create a copy of the rule and disable the original. All the following will need to be run from the manager. In a distributed deployment, the manager node controls all other nodes via salt. Security Onion Solutions You can use salts test.ping to verify that all your nodes are up: Similarly, you can use salts cmd.run to execute a command on all your nodes at once. Ingest. Taiwan, officially the Republic of China (ROC), is a country in East Asia.It is located at the junction of the East and South China Seas in the northwestern Pacific Ocean, with the People's Republic of China (PRC) to the northwest, Japan to the northeast, and the Philippines to the south. This section will cover both network firewalls outside of Security Onion and the host-based firewall built into Security Onion. /opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. This error now occurs in the log due to a change in the exception handling within Salts event module. Security Onion is a free and open-source Linux distribution prepared for intrusion detection, security monitoring, and log management with the assistance of security tools namely Snort,. Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. A new version of our securityonion-rule-update package is now available that distributes OSSEC's local_rules.xml from master server to slave sensors by default and also allows for NIDS/HIDS rule tuning per physical sensor. For a Security Onion client, you should dedicate at least 2GB RAM, but ideally 4GB if possible. Security Onion | InsightIDR Documentation - Rapid7 With this functionality we can suppress rules based on their signature, the source or destination address and even the IP or full CIDR network block. Reboot into your new Security Onion installation and login using the username/password you specified in the previous step. If . Backups; Docker; DNS Anomaly Detection; Endgame; ICMP Anomaly Detection; Jupyter Notebook; Machine Learning; Adding a new disk; PCAPs for Testing; Removing a Node; Syslog Output; UTC and Time Zones; Utilities. Copyright 2023 4. When editing these files, please be very careful to respect YAML syntax, especially whitespace. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you dont want your network sensors to process. I have had issues with Sguil when working with a snapshot and have not found a fix yet.. On Monday, June 26, 2017 at 8:28:44 PM UTC+5:30, KennyWap wrote: security-onion+unsubscribe@googlegroups.com, https://groups.google.com/group/security-onion. Saltstack states are used to ensure the state of objects on a minion. Modifying these values outside of so-allow or so-firewall could lead to problems accessing your existing hosts. When you run so-allow or so-firewall, it modifies this file to include the IP provided in the proper hostgroup. > > => I do not know how to do your guilde line. This directory stores the firewall rules specific to your grid. Generate some traffic to trigger the alert. You can do so via the command line using curl: Alternatively, you could also test for additional hits with a utility called tmNIDS, running the tool in interactive mode: If everything is working correctly, you should see a corresponding alert (GPL ATTACK_RESPONSE id check returned root) in Alerts, Dashboards, Hunt, or Kibana. Security Onion | Web3us LLC As you can see I have the Security Onion machine connected within the internal network to a hub. To generate traffic we are going to use the python library scapy to craft packets with specific information to ensure we trigger the alert with the information we want: Craft the layer 2 information. If you cant run so-rule, you can modify the configuration manually in the manager pillar file at /opt/so/saltstack/local/pillar/minions/_.sls (where is manager, managersearch, standalone, or eval depending on the manager type that was chosen during install).