security onion local rules

If you were to add a search node, you would see its IP appear in both the minion and the search_node host groups. This will add the host group to, Add the desired IPs to the host group. Adding local rules in Security Onion is a rather straightforward process. The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. Revision 39f7be52. The second only needs the $ character escaped to prevent bash from treating that as a variable. In order to apply the threshold to all nodes, place the pillar in /opt/so/saltstack/local/pillar/global.sls. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you don't want your network sensors to process. Copyright 2023 When editing these files, please be very careful to respect YAML syntax, especially whitespace. This writeup contains a listing of important Security Onion files and directories. 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. Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. Logs . Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. to security-onion When I run 'rule-update' it give an error that there are no rules in /usr/local/lib/snort_dynamicrules. https://docs.securityonion.net/en/2.3/local-rules.html?#id1. Once your rules and alerts are under control, then check to see if you have packet loss. Give feedback. These policy types can be found in /etc/nsm/rules/downloaded.rules. 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. Taiwan, officially the Republic of China (ROC), is a country in East Asia.It is located at the junction of the East and South China Seas in the northwestern Pacific Ocean, with the People's Republic of China (PRC) to the northwest, Japan to the northeast, and the Philippines to the south. To configure syslog for Security Onion: Stop the Security Onion service. In this file, the idstools section has a modify sub-section where you can add your modifications. 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. Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). Copyright 2023 /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. Files here should not be modified as changes would be lost during a code update. One thing you can do with it (and the one that most people are interested in) is to configure it for IDS mode. 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. Security Onion is an open source suite of network security monitoring (NSM) tools for evaluating alerts, providing three core functions to the cybersecurity analyst: Full packet capture and data types Network-based and host-based intrusion detection systems Alert analysis tools 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. 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. All the following will need to be run from the manager. 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. Check out our NIDS tuning video at https://youtu.be/1jEkFIEUCuI! . 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. 137 vi local.rules 138 sudo vi local.rules 139 vi cd .. 140 cd .. 141 vi securityonion.conf 142 sudo vi pulledpork/pulledpork.conf 143 sudo rule-update 144 history 145 vi rules/downloaded.rules 146 sudo vi local.rules 147 sudo vi rules/local.rules 160 sudo passwd david 161 sudo visudo 162 sudo vi rules/local.rules . Adding local rules in Security Onion is a rather straightforward process. In 2008, Doug Burks started working on Security Onion, a Linux distribution for intrusion detection, network security monitoring, and log management. 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). Write your rule, see Rules Format and save it. Port groups are a way of grouping together ports similar to a firewall port/service alias. In a distributed deployment, the manager node controls all other nodes via salt. Revision 39f7be52. This first sub-section will discuss network firewalls outside of Security Onion. Long-term you should only run the rules necessary for > your environment. Download Security Onion 20110116. Security Onion Peel Back the Layers of Your Enterprise Monday, January 26, 2009 Integrating Snort 3.0 (SnortSP) and Sguil in 3 Steps So once you have Snort 3.0 installed, what can you do with it? 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. Adding Your Own Rules . 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. 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. Launch your Ubuntu Server VM, log on with credentials provided at the beginning of this guide and open a terminal shell by double-clicking the Desktop shortcut. Managing firewall rules for all devices should be done from the manager node using either so-allow, so-firewall or, for advanced cases, manually editing the yaml files. Cleaning up local_rules.xml backup files older than 30 days. 3. 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. However, the exception is now logged. 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. There are two directories that contain the yaml files for the firewall configuration. 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. Enter the following sample in a line at a time. However, generating custom traffic to test the alert can sometimes be a challenge. When you run so-allow or so-firewall, it modifies this file to include the IP provided in the proper hostgroup. It . In the image below, we can see how we define some rules for an eval node. /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. Security Onion has Snort built in and therefore runs in the same instance. From https://docs.saltstack.com/en/latest/: Salt is a core component of Security Onion 2 as it manages all processes on all 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. You need to configure Security Onion to send syslog so that InsightIDR can ingest it. 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 you purchase products and services from us, you're helping to fund development of Security Onion! 1. 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. You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. 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. However, generating custom traffic to test the alert can sometimes be a challenge. You can learn more about scapy at secdev.org and itgeekchronicles.co.uk. https://securityonion.net/docs/AddingLocalRules. 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. You signed in with another tab or window. 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. If you need to increase this delay, it can be done using the salt:minion:service_start_delay pillar. 7.2. so-rule allows you to disable, enable, or modify NIDS rules. Now that we have a signature that will generate alerts a little more selectively, we need to disable the original signature. MISP Rules. Start creating a file for your rule. For example, suppose we want to disable SID 2100498. 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.