security onion local rules

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. Once your rules and alerts are under control, then check to see if you have packet loss. Revision 39f7be52. Security Onion Lab Setup with VirtualBox | Free Video Tutorial - Udemy Security. Copyright 2023 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. Re: [security-onion] Snort Local rules not getting alerts in ELSA / SQUERT so-rule allows you to disable, enable, or modify NIDS rules. Any definitions made here will override anything defined in other pillar files, including global. Security Onion Documentation Security Onion 2.3 documentation Add the following to the sensor minion pillar file located at. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Adding Local Rules Security Onion 2.3 documentation 2. Its important to note that with this functionality, care should be given to the suppressions being written to make sure they do not suppress legitimate alerts. securityonion-docs/local-rules.rst at master Security-Onion-Solutions Then tune your IDS rulesets. In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. Before You Begin. You should only run the rules necessary for your environment, so you may want to disable entire categories of rules that dont apply to you. Now that we have a signature that will generate alerts a little more selectively, we need to disable the original signature. alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). Do you see these alerts in Squert or ELSA? 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. Please update your bookmarks. GitHub - security-onion-solutions/security-onion/wiki Security Onion Set Up Part 3: Configuration of Version 14.04 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. 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. Beta Copyright 2023 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. 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). Salt is a core component of Security Onion 2 as it manages all processes on all nodes. Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. FAQ Security-Onion-Solutions/security-onion Wiki GitHub Local pillar file: This is the pillar file under /opt/so/saltstack/local/pillar/. Now that the configuration is in place, you can either wait for the sensor to sync with Salt running on the manager, or you can force it to update its firewall by running the following from the manager: Add the required ports to the port group. ELSA? 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. Durian - Wikipedia Let's add a simple rule that will alert on the detection of a string in a tcp session. . lawson cedars. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. > > => I do not know how to do your guilde line. /opt/so/saltstack/local/pillar/minions/, https://www.proofpoint.com/us/threat-insight/et-pro-ruleset, https://www.snort.org/downloads/#rule-downloads, https://www.snort.org/faq/what-are-community-rules, https://snort.org/documents/registered-vs-subscriber, license fee per sensor (users are responsible for purchasing enough licenses for their entire deployment), Snort SO (Shared Object) rules only work with Snort not, same rules as Snort Subscriber ruleset, except rules only retrievable after 30 days past release, not officially managed/supported by Security Onion. to security-onion When I run 'rule-update' it give an error that there are no rules in /usr/local/lib/snort_dynamicrules. 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. Write your rule, see Rules Format and save it. The territories controlled by the ROC consist of 168 islands, with a combined area of 36,193 square . 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. 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. After viewing your redacted sostat it seems that the ICMP and UDP rules are triggering: Are you using SO with in a VM? A Campus Card is your University of Reading student/staff/associate You are an adult, at least 18 years of age, you are familiar with and understand the standards and laws of your local community regarding sexually-oriented media. 5. Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. No rules in /usr/local/lib/snort_dynamicrules - Google Groups Tuning Security Onion 2.3 documentation When editing these files, please be very careful to respect YAML syntax, especially whitespace. All alerts are viewable in Alerts, Dashboards, Hunt, and Kibana. Use one of the following examples in your console/terminal window: sudo nano local.rules sudo vim local.rules. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. The signature id (SID) must be unique. Security Onion is a platform that allows you to monitor your network for security alerts. Adding local rules in Security Onion is a rather straightforward process. To unsubscribe from this group and stop receiving emails from it, send an email to security-onio.@googlegroups.com. This will add the IPs to the host group in, Since we reused the syslog port group that is already defined, we dont need to create a new port group. It incorporates NetworkMiner, CyberChef, Squert, Sguil, Wazuh, Bro, Suricata, Snort, Kibana, Logstash, Elasticsearch, and numerous other security onion tools. Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: jq; so-allow; so-elastic-auth; so . Custom local.rules not showing up in kibana NIDS page #1712 - GitHub . 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. idstools may seem like it is ignoring your disabled rules request if you try to disable a rule that has flowbits set. Logs. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. Next, run so-yara-update to pull down the rules. However, generating custom traffic to test the alert can sometimes be a challenge. Cannot retrieve contributors at this time. Logs Security Onion 2.3 documentation All node types are added to the minion host group to allow Salt communication. Add the following to the minions sls file located at. This first sub-section will discuss network firewalls outside of Security Onion. Salt is a new approach to infrastructure management built on a dynamic communication bus. Tried as per your syntax, but still issue persists. As shown above, we edit the minion pillar and add the SID to the idstools - sids - disabled section. This error now occurs in the log due to a change in the exception handling within Salts event module. It is located at /opt/so/saltstack/local/pillar/global.sls. For some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. we run SO in a distributed deployment and the manager doesn't run strelka but does run on the sensor, the paths however (/opt/so/saltstack/local/salt/strelka/rules) exist on the manger but not the sensor, I did find the default repo under opt/so/saltstack/default/salt/strelka/rules/ on the manager and I can run so-yara-update but not so-strelka-restart because its not running on the manager so I'm a little confused on where I should be putting the custom YARA rules because things don't line up with the documentation or I'm just getting super confused. sigs.securityonion.net (Signature files for Security Onion containers) ghcr.io (Container downloads) rules.emergingthreatspro.com (Emerging Threats IDS rules) rules.emergingthreats.net (Emerging Threats IDS open rules) www.snort.org (Paid Snort Talos ruleset) github.com (Strelka and Sigma rules updates) local.rules not working 3. The remainder of this section will cover the host firewall built into Security Onion. 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. Please note that Suricata 6 has a 64-character limitation on the IP field in a threshold. If so, then tune the number of AF-PACKET workers for sniffing processes. Finally, run so-strelka-restart to allow Strelka to pull in the new rules. There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). If you previously added a host or network to your firewall configuration and now need to remove them, you can use so-firewall with the excludehost option. If you would like to create a rule yourself and use it with Suricata, this guide might be helpful. Then tune your IDS rulesets. 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. This was implemented to avoid some issues that we have seen regarding Salt states that used the ip_interfaces grain to grab the management interface IP. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. Copyright 2023 Generate some traffic to trigger the alert. At the end of this example IPs in the analyst host group, will be able to connect to 80, 443 and 8086 on our standalone node. /opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. Syslog-ng and Security Onion /opt/so/saltstack/local/salt/idstools/local.rules, "GPL ATTACK_RESPONSE id check returned root 2", /opt/so/saltstack/local/salt/strelka/rules, /opt/so/saltstack/local/salt/strelka/rules/localrules, /opt/so/saltstack/local/salt/strelka/rules/, https://github.com/Neo23x0/signature-base. Security Onion has Snort built in and therefore runs in the same instance. Logs . At those times, it can be useful to query the database from the commandline. 3. Security Onion a free and open platform for intrusion detection, enterprise security monitoring, and log management. If you need to manually update your rules, you can run the following on your manager node: If you have a distributed deployment and you update the rules on your manager node, then those rules will automatically replicate from the manager node to your sensors within 15 minutes. A. This will add the host group to, Add the desired IPs to the host group. Global pillar file: This is the pillar file that can be used to make global pillar assignments to the nodes. Cleaning up local_rules.xml backup files older than 30 days. You may want to bump the SID into the 90,000,000 range and set the revision to 1. Modifying these values outside of so-allow or so-firewall could lead to problems accessing your existing hosts. Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: Paste the rule. You could try testing a rule . The next run of idstools should then merge /opt/so/rules/nids/local.rules into /opt/so/rules/nids/all.rules which is what Suricata reads from. Zero Dollar Detection and Response Orchestration with n8n, Security You signed in with another tab or window. For example, suppose that we want to modify SID 2100498 and replace any instances of returned root with returned root test. Answered by weslambert on Dec 15, 2021. Security Onion offers the following choices for rulesets to be used by Suricata. Find Age Regression Discord servers and make new friends! Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. To enable or disable SIDs for Suricata, the Salt idstools pillar can be used in the minion pillar file (/opt/so/saltstack/local/pillar/minions/_.sls). How are they stored? In this file, the idstools section has a modify sub-section where you can add your modifications. We've been teaching Security Onion classes and providing Professional Services since 2014. You signed in with another tab or window. You can learn more about scapy at secdev.org and itgeekchronicles.co.uk. 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. To verify the Snort version, type in snort -Vand hit Enter. 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. You may want to bump the SID into the 90,000,000 range and set the revision to 1. Have you tried something like this, in case you are not getting traffic to $HOME_NET?

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