Salt Security Onion 2.3 documentation If you would like to create a rule yourself and use it with Suricata, this guide might be helpful. Security Onion not detecting traffic - groups.google.com 41 - Network Segmentation, VLANs, and Subnets. 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. 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. If you were to add a search node, you would see its IP appear in both the minion and the search_node host groups. 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. Default pillar file: This is the pillar file located under /opt/so/saltstack/default/pillar/. In a distributed deployment, the manager node controls all other nodes via salt. Let's add a simple rule that will alert on the detection of a string in a tcp session. Please note if you are using a ruleset that enables an IPS policy in /etc/nsm/pulledpork/pulledpork.conf, your local rules will be disabled. Security. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you don't want your network sensors to process. Modifying these values outside of so-allow or so-firewall could lead to problems accessing your existing hosts. Security Onion | InsightIDR Documentation - Rapid7 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. If you need to increase this delay, it can be done using the salt:minion:service_start_delay pillar. 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. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. 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. If there are a large number of uncategorized events in the securityonion_db database, sguil can have a hard time of managing the vast amount of data it needs to process to present a comprehensive overview of the alerts. Then tune your IDS rulesets. Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: Paste the rule. For more information about Salt, please see https://docs.saltstack.com/en/latest/. Hi @Trash-P4nda , I've just updated the documentation to be clearer. to security-onion When I run 'rule-update' it give an error that there are no rules in /usr/local/lib/snort_dynamicrules. Integrating Snort 3.0 (SnortSP) and Sguil in 3 Steps - Security Onion Please note if you are using a ruleset that enables an IPS policy in /etc/nsm/pulledpork/pulledpork.conf, your local rules will be disabled. Write your rule, see Rules Format and save it. To unsubscribe from this group and stop receiving emails from it, send an email to security-onio.@googlegroups.com. 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. Any pointers would be appreciated. Salt is a new approach to infrastructure management built on a dynamic communication bus. Revision 39f7be52. https://securityonion.net/docs/AddingLocalRules. Our products include both the Security Onion software and specialized hardware appliances that are built and tested to run Security Onion. Adding local rules in Security Onion is a rather straightforward process. You can learn more about snort and writing snort signatures from the Snort Manual. 2. Are you sure you want to create this branch? 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 ->. All alerts are viewable in Alerts, Dashboards, Hunt, and Kibana. To get the best performance out of Security Onion, youll want to tune it for your environment. Security Onion Documentation Security Onion 2.3 documentation In order to apply the threshold to all nodes, place the pillar in /opt/so/saltstack/local/pillar/global.sls. Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. 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. Adding Local Rules Security Onion 2.3 documentation Docs Tuning Adding Local Rules Edit on GitHub Adding Local Rules NIDS You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. The signature id (SID) must be unique. Security Onion generates a lot of valuable information for you the second you plug it into a TAP or SPAN port. If you would like to pull in NIDS rules from a MISP instance, please see: For some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. (Archived 1/22) Tuning NIDS Rules in Security Onion - YouTube idstools may seem like it is ignoring your disabled rules request if you try to disable a rule that has flowbits set. One of those regular interventions is to ensure that you are tuning properly and proactively attempting to reach an acceptable level of signal to noise. 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. Adding Local Rules Security Onion 2.3 documentation 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 Security Onion uses idstools to download new signatures every night and process them against a set list of user generated configurations. Diagnostic logs can be found in /opt/so/log/salt/. Answered by weslambert on Dec 15, 2021. Revision 39f7be52. More information on each of these topics can be found in this section. When editing these files, please be very careful to respect YAML syntax, especially whitespace. No rules in /usr/local/lib/snort_dynamicrules - Google Groups There are two directories that contain the yaml files for the firewall configuration. 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. If you dont want to wait 15 minutes, you can force the sensors to update immediately by running the following command on your manager node: Security Onion offers the following choices for rulesets to be used by Suricata. If SID 4321 is noisy, you can disable it as follows: From the manager, run the following to update the config: If you want to disable multiple rules at one time, you can use a regular expression, but make sure you enclose the full entry in single quotes like this: We can use so-rule to modify an existing NIDS rule. As you can see I have the Security Onion machine connected within the internal network to a hub. How are they parsed? Syslog-ng and Security Onion In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. . Reboot into your new Security Onion installation and login using the username/password you specified in the previous step. > To unsubscribe from this topic . Managing Rules Security Onion 2.3 documentation Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. GitHub - security-onion-solutions/security-onion/wiki Important "Security Onion" Files and Directories - Medium Security Onion Lab Setup with VirtualBox | Free Video Tutorial - Udemy You may want to bump the SID into the 90,000,000 range and set the revision to 1. 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. Tried as per your syntax, but still issue persists. Entry-Level Network Traffic Analysis with Security Onion - Totem 4. Cleaning up local_rules.xml backup files older than 30 days. A. 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. And when I check, there are no rules there. In the image below, we can see how we define some rules for an eval node. You need to configure Security Onion to send syslog so that InsightIDR can ingest it. ELSA? For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. The county seat is in Evansville. While Vanderburgh County was the Give feedback. 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. When you purchase products and services from us, you're helping to fund development of Security Onion! This wiki is no longer maintained. Ingest. Can anyone tell me > > > > what I've done wrong please? Salt is a core component of Security Onion 2 as it manages all processes on all nodes. 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). 7.2. Adding Your Own Rules Suricata 6.0.0 documentation - Read the Docs Where is it that you cannot view them? This writeup contains a listing of important Security Onion files and directories. 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). /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. Beta One thing you can do with it (and the one that most people are interested in) is to configure it for IDS mode. 7.2. The files in this directory should not be modified as they could possibly be overwritten during a soup update in the event we update those files. Also ensure you run rule-update on the machine. Copyright 2023 Copyright 2023 In this file, the idstools section has a modify sub-section where you can add your modifications. By default, only the analyst hostgroup is allowed access to the nginx ports. epic charting system training We created and maintain Security Onion, so we know it better than anybody else. This will add the host group to, Add the desired IPs to the host group. If you try to disable the first two rules without disabling the third rule (which has flowbits:isset,ET.MSSQL) the third rule could never fire due to one of the first two rules needing to fire first.