Naming convention: The collection of server processes has a server name separate from the hostname of the box. After select all interfaces also ICMP logs not showing in sguil. in Sguil? Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. These policy types can be found in /etc/nsm/rules/downloaded.rules. Security Onion. 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. Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. Security Onion uses idstools to download new signatures every night and process them against a set list of user generated configurations. 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. Use one of the following examples in your console/terminal window: sudo nano local.rules sudo vim local.rules. Started by Doug Burks, and first released in 2009, Security Onion has. The second only needs the $ character escaped to prevent bash from treating that as a variable. You may want to bump the SID into the 90,000,000 range and set the revision to 1. Introduction Adding local rules in Security Onion is a rather straightforward process. The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. However, the exception is now logged. 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. /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml defines custom port groups. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. and dont forget that the end is a semicolon and not a colon. Default YARA rules are provided from Florian Roths signature-base Github repo at https://github.com/Neo23x0/signature-base. 7.2. For example, if you dont care that users are accessing Facebook, then you can silence the policy-based signatures for Facebook access. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. (Archived 1/22) Tuning NIDS Rules in Security Onion Security Onion 7.5K subscribers 48 Dislike Share 1,465 views Dec 22, 2021 This video has been archived as of January 2022 - the latest. One thing you can do with it (and the one that most people are interested in) is to configure it for IDS mode. 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. After viewing your redacted sostat it seems that the ICMP and UDP rules are triggering: Are you using SO with in a VM? Once your rules and alerts are under control, then check to see if you have packet loss. From the Command Line. All node types are added to the minion host group to allow Salt communication. Now that we have a signature that will generate alerts a little more selectively, we need to disable the original signature. 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. 4. Run so-rule without any options to see the help output: We can use so-rule to modify an existing NIDS rule. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. 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. Some node types get their IP assigned to multiple host groups. 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. 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. Reboot into your new Security Onion installation and login using the username/password you specified in the previous step. If you were to add a search node, you would see its IP appear in both the minion and the search_node host groups. In a distributed deployment, the manager node controls all other nodes via salt. Hi @Trash-P4nda , I've just updated the documentation to be clearer. Copyright 2023 For example, suppose that we want to modify SID 2100498 and replace any instances of returned root with returned root test. Files here should not be modified as changes would be lost during a code update. Can anyone tell me > > > > what I've done wrong please? The server is also responsible for ruleset management. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. The territories controlled by the ROC consist of 168 islands, with a combined area of 36,193 square . Custom rules can be added to the local.rules file Rule threshold entries can . To configure syslog for Security Onion: Stop the Security Onion service. However, generating custom traffic to test the alert can sometimes be a challenge. This directory contains the default firewall rules. By default, only the analyst hostgroup is allowed access to the nginx ports. In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. Generate some traffic to trigger the alert. =========================================================================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=========================================================================. 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. . After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. Backing up current local_rules.xml file. Any line beginning with "#" can be ignored as it is a comment. 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,. Security Onion is a intrusion detection and network monitoring tool. A tag already exists with the provided branch name. Open /etc/nsm/rules/local.rules using your favorite text editor. If you built the rule correctly, then snort should be back up and running. alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). And when I check, there are no rules there. These are the files that will need to be changed in order to customize nodes. 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. If it is, then the most expedient measure may be to resolve the misconfiguration and then reinvestigate tuning. Long-term you should only run the rules necessary for > your environment. Identification. You can find the latest version of this page at: https://securityonion.net/docs/AddingLocalRules. Network Security Monitoring, as a practice, is not a solution you can plug into your network, make sure you see blinking lights and tell people you are secure. It requires active intervention from an analyst to qualify the quantity of information presented. 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. The rule categories are Malware-Cnc, Blacklist, SQL injection, Exploit-kit, and rules from the connectivity ruleset Security: CVSS Score of 8 or higher Vulnerability age is four years old and newer The rule categories include Balanced and Connectivity with one additional category being App-detect /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. Add the following to the sensor minion pillar file located at. Have you tried something like this, in case you are not getting traffic to $HOME_NET? Are you sure you want to create this branch? To add local YARA rules, create a directory in /opt/so/saltstack/local/salt/strelka/rules, for example localrules. Please review the Salt section to understand pillars and templates. 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. 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. However, generating custom traffic to test the alert can sometimes be a challenge. 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. lawson cedars. Please keep this value below 90 seconds otherwise systemd will reach timeout and terminate the service. When I run sostat. c96 extractor. Diagnostic logs can be found in /opt/so/log/salt/. 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. You may see the following error in the salt-master log located at /opt/so/log/salt/master: The root cause of this error is a state trying to run on a minion when another state is already running. idstools may seem like it is ignoring your disabled rules request if you try to disable a rule that has flowbits set. 3. This wiki is no longer maintained. Backing up current downloaded.rules file before it gets overwritten. 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. Where is it that you cannot view them? It incorporates NetworkMiner, CyberChef, Squert, Sguil, Wazuh, Bro, Suricata, Snort, Kibana, Logstash, Elasticsearch, and numerous other security onion tools. You need to configure Security Onion to send syslog so that InsightIDR can ingest it. Revision 39f7be52. It . 1. Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: You can then run curl http://testmynids.org/uid/index.html on the node to generate traffic which should cause this rule to alert (and the original rule that it was copied from, if it is enabled). The county seat is in Evansville. To get the best performance out of Security Onion, youll want to tune it for your environment. Backups; Docker; DNS Anomaly Detection; Endgame; ICMP Anomaly Detection; Jupyter Notebook; Machine Learning; Adding a new disk; PCAPs for Testing; Removing a Node; Syslog Output; UTC and Time Zones; Utilities. 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. Manager of Support and Professional Services. 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. Check out our NIDS tuning video at https://youtu.be/1jEkFIEUCuI! 1. 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. 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. Interested in discussing how our products and services can help your organization? 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. If you would like to pull in NIDS rules from a MISP instance, please see: You signed in with another tab or window. There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). Revision 39f7be52. Let's add a simple rule that will alert on the detection of a string in a tcp session. 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. This way, you still have the basic ruleset, but the situations in which they fire are altered. A. Home About Us Bill Pay 877-213-8180 Product Library My accountItems of interest (0) Get your campus card Your campus card allows you to borrow books from the Library, use services at the student centre, make payments at Macquarie University retail outlets, and identify yourself during class tests and . You can add Wazuh HIDS rules in /opt/so/rules/hids/local_rules.xml. Cannot retrieve contributors at this time. For some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. For a Security Onion client, you should dedicate at least 2GB RAM, but ideally 4GB if possible. All alerts are viewable in Alerts, Dashboards, Hunt, and Kibana. We've been teaching Security Onion classes and providing Professional Services since 2014. Also ensure you run rule-update on the machine. Beta 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. Do you see these alerts in Squert or ELSA? If you would like to create a rule yourself and use it with Suricata, this guide might be helpful. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. 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. 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. 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. 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. Saltstack states are used to ensure the state of objects on a minion. That's what we'll discuss in this section. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you dont want your network sensors to process. In a distributed deployment, the manager node controls all other nodes via salt. 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. This first sub-section will discuss network firewalls outside of Security Onion. We offer both training and support for Security Onion. The National Institutes of Standards and Technology (NIST) 800-171 cybersecurity standard has four safeguards that are related to network traffic monitoring: 3.13.1: Monitor, control, and protect organizational communications (i.e., information transmitted or received by organizational information Salt is a core component of Security Onion 2 as it manages all processes on all nodes. Once logs are generated by network sniffing processes or endpoints, where do they go? The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. Local pillar file: This is the pillar file under /opt/so/saltstack/local/pillar/. Logs. Enter the following sample in a line at a time. If you are on a large network, you may need to do additional tuning like pinning processes to CPU cores. Add the following to the minions sls file located at. Start creating a file for your rule. so-rule allows you to disable, enable, or modify NIDS rules. 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. /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. 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 Copyright 2023 3. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. ELSA? The format of the pillar file can be seen below, as well as in /opt/so/saltstack/default/pillar/thresholding/pillar.usage and /opt/so/saltstack/default/pillar/thresholding/pillar.example. 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. Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. 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. . Modifying these values outside of so-allow or so-firewall could lead to problems accessing your existing hosts. You signed in with another tab or window. Fresh install of Security Onion 16.04.6.3 ISO to hardware: Two NICs, one facing management network, one monitoring mirrored port for test network Setup for Production Mode, pretty much all defaults, suricata create alert rules for /etc/nsm/local.rules and run rule-update Log into scapy/msf on kalibox, send a few suspicious packets Salt can be used for data-driven orchestration, remote execution for any infrastructure, configuration management for any app stack, and much more.
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