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. This is located at /opt/so/saltstack/local/pillar/minions/.sls. 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. 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. In 2008, Doug Burks started working on Security Onion, a Linux distribution for intrusion detection, network security monitoring, and log management. To get the best performance out of Security Onion, youll want to tune it for your environment. alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). In syslog-ng, the following configuration forwards all local logs to Security Onion. 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. Let's add a simple rule that will alert on the detection of a string in a tcp session. To configure syslog for Security Onion: Stop the Security Onion service. However, generating custom traffic to test the alert can sometimes be a challenge. 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. Download Security Onion 20110116. 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. epic charting system training You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. Any line beginning with "#" can be ignored as it is a comment. For example: If you need to modify a part of a rule that contains a special character, such as a $ in variable names, the special character needs to be escaped in the search part of the modify string. Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: Beta idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. Security Onion uses idstools to download new signatures every night and process them against a set list of user generated configurations. Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. This is an advanced case and you most likely wont never need to modify these files. For example, consider the following rules that reference the ET.MSSQL flowbit. 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. When editing these files, please be very careful to respect YAML syntax, especially whitespace. There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). If you need to increase this delay, it can be done using the salt:minion:service_start_delay pillar. 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. 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. This directory stores the firewall rules specific to your grid. 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. Re: [security-onion] Snort Local rules not getting alerts in ELSA / SQUERT 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. If you would like to pull in NIDS rules from a MISP instance, please see: Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. When configuring network firewalls for distributed deployments, youll want to ensure that nodes can connect as shown below. 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. Security. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. 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 In a distributed deployment, the manager node controls all other nodes via salt. MISP Rules. ManagingAlerts Security-Onion-Solutions/security-onion Wiki - GitHub A. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. You can find the latest version of this page at: https://securityonion.net/docs/AddingLocalRules. 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. Saltstack states are used to ensure the state of objects on a minion. 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). Local YARA rules Discussion #6556 Security-Onion - GitHub Durio zibethinus, native to Borneo and Sumatra, is the only species available in the international market.It has over 300 named varieties in Thailand and 100 in Malaysia, as of 1987. In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. 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! /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml defines custom 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. 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. You received this message because you are subscribed to the Google Groups "security-onion" group. No rules in /usr/local/lib/snort_dynamicrules - Google Groups Have you tried something like this, in case you are not getting traffic to $HOME_NET? Age Regression SuppliesWelcome Welcome to Gabby's Little Store! This is 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. 'Re: [security-onion] Rule still triggering even after modifying to 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. And when I check, there are no rules there. Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. In a distributed deployment, the manager node controls all other nodes via salt. Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. How are they stored? Adding Local Rules Security Onion 2.3 documentation Adding Your Own Rules . Escalate local privileges to root level. securityonion-docs/local-rules.rst at master Security-Onion-Solutions If you do not see this alert, try checking to see if the rule is enabled in /opt/so/rules/nids/all.rules: Rulesets come with a large number of rules enabled (over 20,000 by default). Our documentation has moved to https://securityonion.net/docs/. 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. In the image below, we can see how we define some rules for an eval node. 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. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. It incorporates NetworkMiner, CyberChef, Squert, Sguil, Wazuh, Bro, Suricata, Snort, Kibana, Logstash, Elasticsearch, and numerous other security onion tools. /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. Run rule-update (this will merge local.rules into downloaded.rules, update. Logs. However, generating custom traffic to test the alert can sometimes be a challenge. 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. Data collection Examination Port groups are a way of grouping together ports similar to a firewall port/service alias. lawson cedars. Disabling all three of those rules by adding the following to disablesid.conf has the obvious negative effect of disabling all three of the rules: When you run sudo so-rule-update, watch the Setting Flowbit State section and you can see that if you disable all three (or however many rules share that flowbit) that the Enabled XX flowbits line is decremented and all three rules should then be disabled in your all.rules. Copyright 2023 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. /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. /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. To enable the ET Pro ruleset in an already installed grid, modify the /opt/so/saltstack/local/pillar/minions/ file as follows: Since Shared Object rules wont work with Suricata, you may want to disable them using a regex like 're:soid [0-9]+' as described in the Managing Alerts section. Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. It . 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. You signed in with another tab or window. Here are some of the items that can be customized with pillar settings: Currently, the salt-minion service startup is delayed by 30 seconds. 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. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. to security-onion When I run 'rule-update' it give an error that there are no rules in /usr/local/lib/snort_dynamicrules. FAQ Security-Onion-Solutions/security-onion Wiki GitHub You need to configure Security Onion to send syslog so that InsightIDR can ingest it. From https://docs.saltstack.com/en/latest/: Salt is a core component of Security Onion 2 as it manages all processes on all nodes. The second only needs the $ character escaped to prevent bash from treating that as a variable. Tuning NIDS Rules in Security Onion - YouTube 0:00 / 15:12 Tuning NIDS Rules in Security Onion 1,511 views Jan 10, 2022 This video shows you how to tune Suricata NIDS rules in. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. the rule is missing a little syntax, maybe try: alert icmp any any -> $HOME_NET any (msg:"ICMP Testing"; sid:1000001; rev:1;). Security Onion is a free and open source platform for threat hunting, network security monitoring, and log management. Adding local rules in Security Onion is a rather straightforward process. Security Onion is a intrusion detection and network monitoring tool. You could try testing a rule . Are you sure you want to create this branch? Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. To add local YARA rules, create a directory in /opt/so/saltstack/local/salt/strelka/rules, for example localrules. 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.