Our documentation has moved to https://securityonion.net/docs/. Host groups and port groups can be created or modified from the manager node using either so-allow, so-firewall or manually editing the yaml files. How are they parsed? All alerts are viewable in Alerts, Dashboards, Hunt, and Kibana. Copyright 2023 Also ensure you run rule-update on the machine. Let's add a simple rule that will alert on the detection of a string in a tcp session: Run rule-update (this will merge local.rules into downloaded.rules, update sid-msg.map, and restart processes as necessary): If you built the rule correctly, then Snort/Suricata should be back up and running. You signed in with another tab or window. This writeup contains a listing of important Security Onion files and directories. 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. By default, only the analyst hostgroup is allowed access to the nginx ports. "; reference: url,http://holisticinfosec.blogspot.com/2011/12/choose-2011-toolsmith-tool-of-year.html; content: "toolsmith"; flow:to_server; nocase; sid:9000547; metadata:policy security-ips; rev:1). Security Onion is a intrusion detection and network monitoring tool. The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. Our instructors are the only Security Onion Certified Instructors in the world and our course material is the only authorized training material for Security Onion. https://securityonion.net/docs/AddingLocalRules. 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. Manager of Support and Professional Services. Add the following to the sensor minion pillar file located at. Security Onion uses idstools to download new signatures every night and process them against a set list of user generated configurations. A. Been looking to add some custom YARA rules and have been following the docs https://docs.securityonion.net/en/2.3/local-rules.html?#id1 however I'm a little confused. Identification. If you have multiple entries for the same SID, it will cause an error in salt resulting in all of the nodes in your grid to error out when checking in. 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. 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. Security Onion is a free and open source platform for threat hunting, network security monitoring, and log management. This will execute salt-call state.highstate -l info which outputs to the terminal with the log level set to info so that you can see exactly whats happening: Many of the options that are configurable in Security Onion 2 are done via pillar assignments in either the global or minion pillar files. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. Revision 39f7be52. 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. Write your rule, see Rules Format and save it. For example, suppose that we want to modify SID 2100498 and replace any instances of returned root with returned root test. Started by Doug Burks, and first released in 2009, Security Onion has. so-rule allows you to disable, enable, or modify NIDS rules. 3. Cleaning up local_rules.xml backup files older than 30 days. 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. /opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. For example, if you want to modify SID 2009582 and change $EXTERNAL_NET to $HOME_NET: The first string is a regex pattern, while the second is just a raw value. For example, suppose we want to disable SID 2100498. Default YARA rules are provided from Florian Roths signature-base Github repo at https://github.com/Neo23x0/signature-base. Any pointers would be appreciated. If you need to increase this delay, it can be done using the salt:minion:service_start_delay pillar. For example, if you had a web server you could include 80 and 443 tcp into an alias or in this case a port group. To add local YARA rules, create a directory in /opt/so/saltstack/local/salt/strelka/rules, for example localrules. /opt/so/saltstack/default/salt/firewall/assigned_hostgroups.map.yaml is where the default allow rules come together and pair hostgroups and portgroups and assign that pairing to a node based on its role in the grid. 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. (Alternatively, you can press Ctrl+Alt+T to open a new shell.) If you want to tune Wazuh HIDS alerts, please see the Wazuh section. ELSA? ET Open optimized for Suricata, but available for Snort as well free For more information, see: https://rules.emergingthreats.net/open/ ET Pro (Proofpoint) optimized for Suricata, but available for Snort as well rules retrievable as released Minion pillar file: This is the minion specific pillar file that contains pillar definitions for that node. Full Name. > To unsubscribe from this topic . When you purchase products and services from us, you're helping to fund development of Security Onion! The territories controlled by the ROC consist of 168 islands, with a combined area of 36,193 square . There are multiple ways to handle overly productive signatures and well try to cover as many as we can without producing a full novel on the subject. If you dont want to wait for these automatic processes, you can run them manually from the manager (replacing $SENSORNAME_$ROLE as necessary): Lets add a simple rule to /opt/so/saltstack/local/salt/idstools/local.rules thats really just a copy of the traditional id check returned root rule: Restart Suricata (replacing $SENSORNAME_$ROLE as necessary): If you built the rule correctly, then Suricata should be back up and running. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. In syslog-ng, the following configuration forwards all local logs to Security Onion. If you want to apply the threshold to a single node, place the pillar in /opt/so/saltstack/local/pillar/minions/.sls. For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. The ip addresses can be random, but I would suggest sticking to RFC1918: Craft the layer 3 information Since we specified port 7789 in our snort rule: Use the / operator to compose our packet and transfer it with the send() method: Check Sguil/Squert/Kibana for the corresponding alert. 41 - Network Segmentation, VLANs, and Subnets. Of course, the target IP address will most likely be different in your environment: destination d_tcp { tcp("192.168.3.136" port(514)); }; log { Now that we have a signature that will generate alerts a little more selectively, we need to disable the original signature. You received this message because you are subscribed to the Google Groups "security-onion" group. You signed in with another tab or window. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Though each engine uses its own severity level system, Security Onion converts that to a standardized alert severity: event.severity: 4 ==> event.severity_label: critical, event.severity: 3 ==> event.severity_label: high, event.severity: 2 ==> event.severity_label: medium, event.severity: 1 ==> event.severity_label: low. 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. This way, you still have the basic ruleset, but the situations in which they fire are altered. How are they stored? There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). 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: These policy types can be found in /etc/nsm/rules/downloaded.rules. If you would like to create a rule yourself and use it with Suricata, this guide might be helpful. Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. You can read more about this at https://redmine.openinfosecfoundation.org/issues/4377. At those times, it can be useful to query the database from the commandline. 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. It is located at /opt/so/saltstack/local/pillar/global.sls. You do not have permission to delete messages in this group, Either email addresses are anonymous for this group or you need the view member email addresses permission to view the original message. You can then run curl http://testmynids.org/uid/index.html on the node to generate traffic which should cause this rule to alert (and the original rule that it was copied from, if it is enabled). Finally, run so-strelka-restart to allow Strelka to pull in the new rules. This section will cover both network firewalls outside of Security Onion and the host-based firewall built into Security Onion. 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. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. 2GB RAM will provide decent performance for the Sguil client and retrieving packet captures from the server but also enough to run Security Onion in standalone mode for monitoring the local client and testing packet captures with tools like tcpreplay, 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. . Then tune your IDS rulesets. Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. This will add the host group to, Add the desired IPs to the host group. Saltstack states are used to ensure the state of objects on a minion. You can find the latest version of this page at: https://securityonion.net/docs/AddingLocalRules. This directory stores the firewall rules specific to your grid. From the Command Line. Logs. Files here should not be modified as changes would be lost during a code update. The county seat is in Evansville. 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). For example, consider the following rules that reference the ET.MSSQL flowbit. Some of these refer to areas where data is stored, while others point to configuration files that can be modified to change how Security Onion interacts with various tools. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you don't want your network sensors to process. In this step we are redefining the nginx port group, so be sure to include the default ports as well if you want to keep them: Associate this port group redefinition to a node. 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. to security-onion > > My rules is as follows: > > alert icmp any any -> (msg:"ICMP Testing"; sid:1000001; rev:1:) the rule is missing a little syntax, maybe try: alert icmp any any ->. Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). Revision 39f7be52. Run the following command to get a listing of categories and the number of rules in each: In tuning your sensor, you must first understand whether or not taking corrective actions on this signature will lower your overall security stance. 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. We offer both training and support for Security Onion. in Sguil? 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. https://docs.securityonion.net/en/2.3/local-rules.html?#id1. /opt/so/saltstack/local/salt/firewall/assigned_hostgroups.local.map.yaml is where host group and port group associations would be made to create custom host group and port group assignements that would apply to all nodes of a certain role type in the grid. Security Onion offers the following choices for rulesets to be used by Snort/Suricata: ET Open optimized for Suricata, but available for Snort as well free For more information, see: https://rules.emergingthreats.net/open/ ET Pro (Proofpoint) optimized for Suricata, but available for Snort as well rules retrievable as released Local pillar file: This is the pillar file under /opt/so/saltstack/local/pillar/. When configuring network firewalls for Internet-connected deployments (non-Airgap), youll want to ensure that the deployment can connect outbound to the following: In the case of a distributed deployment, you can configure your nodes to pull everything from the manager so that only the manager requires Internet access. To enable the Talos Subscriber ruleset in an already installed grid, modify the /opt/so/saltstack/local/pillar/minions/ file as follows: To add other remotely-accessible rulesets, add an entry under urls for the ruleset URL in /opt/so/saltstack/local/pillar/minions/: Copyright 2023 The firewall state is designed with the idea of creating port groups and host groups, each with their own alias or name, and associating the two in order to create an allow rule. Logs . Modifying these values outside of so-allow or so-firewall could lead to problems accessing your existing hosts. Revision 39f7be52. Generate some traffic to trigger the alert. The format of the pillar file can be seen below, as well as in /opt/so/saltstack/default/pillar/thresholding/pillar.usage and /opt/so/saltstack/default/pillar/thresholding/pillar.example. 7.2. Copyright 2023 Generate some traffic to trigger the alert. /opt/so/saltstack/default/salt/firewall/portgroups.yaml, /opt/so/saltstack/default/salt/firewall/hostgroups.yaml, /opt/so/saltstack/default/salt/firewall/assigned_hostgroups.map.yaml, /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml, /opt/so/saltstack/local/salt/firewall/hostgroups.local.yaml, /opt/so/saltstack/local/salt/firewall/assigned_hostgroups.local.map.yaml, /opt/so/saltstack/local/pillar/minions/_.sls, Allow hosts to send syslog to a sensor node, raw.githubusercontent.com (Security Onion public key), sigs.securityonion.net (Signature files for Security Onion containers), rules.emergingthreatspro.com (Emerging Threats IDS rules), rules.emergingthreats.net (Emerging Threats IDS open rules), github.com (Strelka and Sigma rules updates), geoip.elastic.co (GeoIP updates for Elasticsearch), storage.googleapis.com (GeoIP updates for Elasticsearch), download.docker.com (Docker packages - Ubuntu only), repo.saltstack.com (Salt packages - Ubuntu only), packages.wazuh.com (Wazuh packages - Ubuntu only), 3142 (Apt-cacher-ng) (if manager proxy enabled, this is repocache.securityonion.net as mentioned above), Create a new host group that will contain the IPs of the hosts that you want to allow to connect to the sensor.
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