Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you don't want your network sensors to process. to security-onion When I run 'rule-update' it give an error that there are no rules in /usr/local/lib/snort_dynamicrules. 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. Add the following to the minions sls file located at. 3. Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. 2GB RAM will provide decent performance for the Sguil client and retrieving packet captures from the server but also enough to run Security Onion in standalone mode for monitoring the local client and testing packet captures with tools like tcpreplay, 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. 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. Security Onion. 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 built the rule correctly, then snort should be back up and running. These non-manager nodes are referred to as salt minions. Security Onion uses idstools to download new signatures every night and process them against a set list of user generated configurations. I went ahead and put in the below rules under /etc/nsm/local.rules and ran the rule-update command. Revision 39f7be52. To verify the Snort version, type in snort -Vand hit Enter. 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. 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. 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. In many of the use cases below, we are providing the ability to modify a configuration file by editing either the global or minion pillar file. . 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,. 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. You could try testing a rule . These non-manager nodes are referred to as salt minions. 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. . However, generating custom traffic to test the alert can sometimes be a challenge. 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. 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. To get the best performance out of Security Onion, youll want to tune it for your environment. Salt is a new approach to infrastructure management built on a dynamic communication bus. 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? Global pillar file: This is the pillar file that can be used to make global pillar assignments to the nodes. Backing up current downloaded.rules file before it gets overwritten. If it is, then the most expedient measure may be to resolve the misconfiguration and then reinvestigate tuning. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. Nodes will be configured to pull from repocache.securityonion.net but this URL does not actually exist on the Internet, it is just a special address for the manager proxy. For more information, please see: # alert ip any any -> any any (msg:"GPL ATTACK_RESPONSE id check returned root"; content:"uid=0|28|root|29|"; classtype:bad-unknown; sid:2100498; rev:7; metadata:created_at 2010_09_23, updated_at 2010_09_23;), /opt/so/saltstack/local/pillar/minions/_.sls, "GPL ATTACK_RESPONSE id check returned root test", /opt/so/saltstack/default/pillar/thresholding/pillar.usage, /opt/so/saltstack/default/pillar/thresholding/pillar.example, /opt/so/saltstack/local/pillar/global.sls, /opt/so/saltstack/local/pillar/minions/.sls, https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html, https://redmine.openinfosecfoundation.org/issues/4377, https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. These are the files that will need to be changed in order to customize nodes. When you run so-allow or so-firewall, it modifies this file to include the IP provided in the proper hostgroup. Open /etc/nsm/rules/local.rules using your favorite text editor. 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. 1. However, the exception is now logged. That's what we'll discuss in this section. Once logs are generated by network sniffing processes or endpoints, where do they go? In a distributed deployment, the manager node controls all other nodes via salt. Salt sls files are in YAML format. Enter the following sample in a line at a time. Here are some of the items that can be customized with pillar settings: Currently, the salt-minion service startup is delayed by 30 seconds. Try checking /var/log/nsm/hostname-interface/snortu-1.log for clues and please post the exact rule syntax you are attempting to use. 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. 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. Though each engine uses its own severity level system, Security Onion converts that to a standardized alert severity: event.severity: 4 ==> event.severity_label: critical, event.severity: 3 ==> event.severity_label: high, event.severity: 2 ==> event.severity_label: medium, event.severity: 1 ==> event.severity_label: low. This error now occurs in the log due to a change in the exception handling within Salts event module. Saltstack states are used to ensure the state of objects on a minion. How are they parsed? In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. Copyright 2023 Set anywhere from 5 to 12 in the local_rules Kevin. If this is a distributed deployment, edit local.rules on your master server and it will replicate to your sensors. Salt is a core component of Security Onion 2 as it manages all processes on all nodes. Logs. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. 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. Custom rules can be added to the local.rules file Rule threshold entries can . Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. https://securityonion.net/docs/AddingLocalRules. Copyright 2023 Hi @Trash-P4nda , I've just updated the documentation to be clearer. 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). A tag already exists with the provided branch name. Add the following to the sensor minion pillar file located at. You can learn more about scapy at secdev.org and itgeekchronicles.co.uk. There are multiple ways to handle overly productive signatures and well try to cover as many as we can without producing a full novel on the subject. 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. > > => I do not know how to do your guilde line. Data collection Examination Once your rules and alerts are under control, then check to see if you have packet loss. You can do the reverse unit conversion from MPa to psi, or enter any two units below:LED MSI Optix G242 24 inch IPS Gaming Monitor - Full HD - 144Hz Refresh Rate - 1ms Response time - Adaptive Sync for Esports (9S6-3BA41T-039) LED MSI OPTIX G272 Gaming Monitor 27" FHD IPS 144HZ 1MS Adaptive Sync (9S6-3CB51T-036) LG 27 FHD IPS 1ms 240Hz G . Check out our NIDS tuning video at https://youtu.be/1jEkFIEUCuI! (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. It is now read-only. /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. Generate some traffic to trigger the alert. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. I've just updated the documentation to be clearer. Assuming you have Internet access, Security Onion will automatically update your NIDS rules on a daily basis. For more information, please see https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. 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. We created and maintain Security Onion, so we know it better than anybody else. There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). Write your rule, see Rules Format and save it. Backing up current local_rules.xml file. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. Revision 39f7be52. /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. There isnt much in here other than anywhere, dockernet, localhost and self. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you dont want your network sensors to process. Escalate local privileges to root level. Security Onion is an open-source and free Linux distribution for log management, enterprise security monitoring, and intrusion detection. For a Security Onion client, you should dedicate at least 2GB RAM, but ideally 4GB if possible. 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. This directory contains the default firewall rules. idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. These policy types can be found in /etc/nsm/rules/downloaded.rules. Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. Copyright 2023 You signed in with another tab or window. /opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. See above for suppress examples. You may want to bump the SID into the 90,000,000 range and set the revision to 1. For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. To configure syslog for Security Onion: Stop the Security Onion service. Our products include both the Security Onion software and specialized hardware appliances that are built and tested to run Security Onion. Please keep this value below 90 seconds otherwise systemd will reach timeout and terminate the service. (Alternatively, you can press Ctrl+Alt+T to open a new shell.) Previously, in the case of an exception, the code would just pass. Do you see these alerts in Squert or ELSA? 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 All the following will need to be run from the manager. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. Integrated into the Security Onion, OSSEC is a host-based intrusion detection system (HIDS) that can conduct file integrity monitoring, local log monitoring, system process monitoring, and rootkit detection. the rule is missing a little syntax, maybe try: alert icmp any any -> $HOME_NET any (msg:"ICMP Testing"; sid:1000001; rev:1;). By default, only the analyst hostgroup is allowed access to the nginx ports. Inside of /opt/so/saltstack/local/salt/strelka/rules/localrules, add your YARA rules. 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. According to NIST, which step in the digital forensics process involves drawing conclusions from data? Any definitions made here will override anything defined in other pillar files, including global. Answered by weslambert on Dec 15, 2021. Identification. You may want to bump the SID into the 90,000,000 range and set the revision to 1. Default YARA rules are provided from Florian Roths signature-base Github repo at https://github.com/Neo23x0/signature-base. Give feedback. Cannot retrieve contributors at this time. 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. 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. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. 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. Revision 39f7be52. Now that we have a signature that will generate alerts a little more selectively, we need to disable the original signature. 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 To unsubscribe from this group and stop receiving emails from it, send an email to. You can add Wazuh HIDS rules in /opt/so/rules/hids/local_rules.xml. 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. 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. /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. 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. 3. . When editing these files, please be very careful to respect YAML syntax, especially whitespace. Adding local rules in Security Onion is a rather straightforward process. 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. 5. In a distributed deployment, the manager node controls all other nodes via salt. You signed in with another tab or window. Please review the Salt section to understand pillars and templates. Reboot into your new Security Onion installation and login using the username/password you specified in the previous step. Revision 39f7be52. 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 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. 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. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. 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. . Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. Any pointers would be appreciated. Then tune your IDS rulesets. When configuring network firewalls for Internet-connected deployments (non-Airgap), youll want to ensure that the deployment can connect outbound to the following: In the case of a distributed deployment, you can configure your nodes to pull everything from the manager so that only the manager requires Internet access. 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. You can read more about this at https://redmine.openinfosecfoundation.org/issues/4377. To add local YARA rules, create a directory in /opt/so/saltstack/local/salt/strelka/rules, for example localrules. For example, consider the following rules that reference the ET.MSSQL flowbit. 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 Adding Your Own Rules . Salt sls files are in YAML format. Generate some traffic to trigger the alert. From the Command Line. Security Onion a free and open platform for intrusion detection, enterprise security monitoring, and log management. This is an advanced case and you most likely wont never need to modify these files. "; reference: url,http://holisticinfosec.blogspot.com/2011/12/choose-2011-toolsmith-tool-of-year.html; content: "toolsmith"; flow:to_server; nocase; sid:9000547; metadata:policy security-ips; rev:1). 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. Beta Find Age Regression Discord servers and make new friends! Use one of the following examples in your console/terminal window: sudo nano local.rules sudo vim local.rules. Long-term you should only run the rules necessary for > your environment. If . Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. However, generating custom traffic to test the alert can sometimes be a challenge. Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. 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. If you need to increase this delay, it can be done using the salt:minion:service_start_delay pillar. At those times, it can be useful to query the database from the commandline. 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. Revision 39f7be52. Port groups are a way of grouping together ports similar to a firewall port/service alias. https://docs.securityonion.net/en/2.3/local-rules.html?#id1. 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 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. 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. 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. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. This writeup contains a listing of important Security Onion files and directories. The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. This directory stores the firewall rules specific to your grid. Ingest. The error can be ignored as it is not an indication of any issue with the minions. If you want to tune Wazuh HIDS alerts, please see the Wazuh section.