Security Onion has Snort built in and therefore runs in the same instance. But after I run the rule-update command, no alert is generated in Sguil based on that rule.It was working when I first installed Security Onion. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. Files here should not be modified as changes would be lost during a code update. =========================================================================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=========================================================================. Assuming you have Internet access, Security Onion will automatically update your NIDS rules on a daily basis. Salt is a new approach to infrastructure management built on a dynamic communication bus. How are they stored? Generate some traffic to trigger the alert. Any definitions made here will override anything defined in other pillar files, including global. 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). Start creating a file for your rule. We can start by listing any rules that are currently modified: Lets first check the syntax for the add option: Now that we understand the syntax, lets add our modification: Once the command completes, we can verify that our modification has been added: Finally, we can check the modified rule in /opt/so/rules/nids/all.rules: To include an escaped $ character in the regex pattern youll need to make sure its properly escaped. In a distributed Security Onion environment, you only need to change the configuration in the manager pillar and then all other nodes will get the updated rules automatically. 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. Manager of Support and Professional Services. For example, if you dont care that users are accessing Facebook, then you can silence the policy-based signatures for Facebook access. 4. You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. There are many ways to achieve age regression, but the three primary methods are: Botox. 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. Finally, run so-strelka-restart to allow Strelka to pull in the new rules. Enter the following sample in a line at a time. Copyright 2023 You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. Beta ELSA? Security Onion a free and open platform for intrusion detection, enterprise security monitoring, and log management. 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. Security Onion is an open-source and free Linux distribution for log management, enterprise security monitoring, and intrusion detection. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. 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. Generate some traffic to trigger the alert. 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. For example, suppose that we want to modify SID 2100498 and replace any instances of returned root with returned root test. 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. Minion pillar file: This is the minion specific pillar file that contains pillar definitions for that node. /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. These are the files that will need to be changed in order to customize nodes. 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. When setup is run on a new node, it will SSH to the manager using the soremote account and add itself to the appropriate host groups. The second only needs the $ character escaped to prevent bash from treating that as a variable. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. You signed in with another tab or window. In the image below, we can see how we define some rules for an eval node. 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). Before You Begin. 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. To unsubscribe from this group and stop receiving emails from it, send an email to. Started by Doug Burks, and first released in 2009, Security Onion has. 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. Salt can be used for data-driven orchestration, remote execution for any infrastructure, configuration management for any app stack, and much more. Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: Paste the rule. 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. If you built the rule correctly, then snort should be back up and running. Between Zeek logs, alert data from Suricata, and full packet capture from Stenographer, you have enough information to begin identifying areas of interest and making positive changes to your security stance. The county seat is in Evansville. Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. 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 Backing up current downloaded.rules file before it gets overwritten. If you want to tune Wazuh HIDS alerts, please see the Wazuh section. 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. idstools may seem like it is ignoring your disabled rules request if you try to disable a rule that has flowbits set. Security Onion Layers Ubuntu based OS Snort, Suricata Snorby Bro Sguil Squert This error now occurs in the log due to a change in the exception handling within Salts event module. However, generating custom traffic to test the alert can sometimes be a challenge. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. lawson cedars. 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. Revision 39f7be52. 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,. When you run so-allow or so-firewall, it modifies this file to include the IP provided in the proper hostgroup. Copyright 2023 To configure syslog for Security Onion: Stop the Security Onion service. Naming convention: The collection of server processes has a server name separate from the hostname of the box. Open /etc/nsm/rules/local.rules using your favorite text editor. Copyright 2023 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. Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. Our products include both the Security Onion software and specialized hardware appliances that are built and tested to run Security Onion. After select all interfaces also ICMP logs not showing in sguil. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. . In order to apply the threshold to all nodes, place the pillar in /opt/so/saltstack/local/pillar/global.sls. 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. The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. Revision 39f7be52. Check out our NIDS tuning video at https://youtu.be/1jEkFIEUCuI! 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. Answered by weslambert on Dec 15, 2021. 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.

Stop Disasters Game Earthquake 15 Key Facts, Articles S