Salt can be used for data-driven orchestration, remote execution for any infrastructure, configuration management for any app stack, and much more. /opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. (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NIDS Rules in Security Onion Security Onion 7.5K subscribers 48 Dislike Share 1,465 views Dec 22, 2021 This video has been archived as of January 2022 - the latest. Check your syslog-ng configuration for the name of the local log source ("src" is used on SUSE systems). Also ensure you run rule-update on the machine. 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. Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. /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. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. 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. If you dont want to wait for these automatic processes, you can run them manually from the manager (replacing $SENSORNAME_$ROLE as necessary): Lets add a simple rule to /opt/so/saltstack/local/salt/idstools/local.rules thats really just a copy of the traditional id check returned root rule: Restart Suricata (replacing $SENSORNAME_$ROLE as necessary): If you built the rule correctly, then Suricata should be back up and running. local.rules not working If you want to tune Wazuh HIDS alerts, please see the Wazuh section. For example, suppose that we want to modify SID 2100498 and replace any instances of returned root with returned root test. 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. Please note that Suricata 6 has a 64-character limitation on the IP field in a threshold. A node that has a port group and host group association assigned to it will allow those hosts to connect to those ports on that node. 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. 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. Default YARA rules are provided from Florian Roths signature-base Github repo at https://github.com/Neo23x0/signature-base. A Campus Card is your University of Reading student/staff/associate You can learn more about scapy at secdev.org and itgeekchronicles.co.uk. Adding local rules in Security Onion is a rather straightforward process. 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. Interested in discussing how our products and services can help your organization? And when I check, there are no rules there. 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. For example, if you dont care that users are accessing Facebook, then you can silence the policy-based signatures for Facebook access. For more information, please see https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. 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. Copyright 2023 Our documentation has moved to https://securityonion.net/docs/. This repository has been archived by the owner on Apr 16, 2021. For some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. Copyright 2023 Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. 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. 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. 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. Local pillar file: This is the pillar file under /opt/so/saltstack/local/pillar/. For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. 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 . According to NIST, which step in the digital forensics process involves drawing conclusions from data? /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. Try checking /var/log/nsm/hostname-interface/snortu-1.log for clues and please post the exact rule syntax you are attempting to use. 4. Adding local rules in Security Onion is a rather straightforward process. In this file, the idstools section has a modify sub-section where you can add your modifications. The second only needs the $ character escaped to prevent bash from treating that as a variable. The easiest way to test that our NIDS is working as expected might be to simply access http://testmynids.org/uid/index.html from a machine that is being monitored by Security Onion. Some node types get their IP assigned to multiple host groups. Answered by weslambert on Dec 15, 2021. . 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. Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. For example, if you include a bad custom snort rule with incorrect syntax, the snort engine will fail . Adding Local Rules Security Onion 2.3 documentation Here are some of the items that can be customized with pillar settings: Currently, the salt-minion service startup is delayed by 30 seconds. 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. 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). It is located at /opt/so/saltstack/local/pillar/global.sls. 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 See above for suppress examples. To add local YARA rules, create a directory in /opt/so/saltstack/local/salt/strelka/rules, for example localrules. 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. Was this translation helpful? securityonion-docs/local-rules.rst at master Security-Onion-Solutions 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. ELSA? Data collection Examination 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 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 /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. 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! 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. alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). 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. 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. 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. Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. 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. Logs . OSSEC custom rules not generating alerts - Google Groups You signed in with another tab or window. Please provide the output of sostat-redacted, attaching as a plain text file, or by using a service like Pastebin.com. . Security Onion. 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. 3. 1. Salt is a core component of Security Onion 2 as it manages all processes on all nodes. Any definitions made here will override anything defined in other pillar files, including global. You could try testing a rule . If you built the rule correctly, then snort should be back up and running. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. For example, suppose we want to disable SID 2100498. Minion pillar file: This is the minion specific pillar file that contains pillar definitions for that node. Integrating Snort 3.0 (SnortSP) and Sguil in 3 Steps - Security Onion 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. Our products include both the Security Onion software and specialized hardware appliances that are built and tested to run Security Onion. Finally, run so-strelka-restart to allow Strelka to pull in the new rules. To verify the Snort version, type in snort -Vand hit Enter. idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. MISP Rules. When editing these files, please be very careful to respect YAML syntax, especially whitespace. Security Onion Layers Ubuntu based OS Snort, Suricata Snorby Bro Sguil Squert Revision 39f7be52. Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. 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. 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. You may want to bump the SID into the 90,000,000 range and set the revision to 1. 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. You can find the latest version of this page at: https://securityonion.net/docs/AddingLocalRules. 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 . Custom rules can be added to the local.rules file Rule threshold entries can . 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. All node types are added to the minion host group to allow Salt communication. If you need to increase this delay, it can be done using the salt:minion:service_start_delay pillar. There are two directories that contain the yaml files for the firewall configuration. 5. 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. Enter the following sample in a line at a time. Convert PSI to MPA | Chapel Steel Convert psi to - francescolangella.it Reboot into your new Security Onion installation and login using the username/password you specified in the previous step. Add the following to the minions sls file located at. We've been teaching Security Onion classes and providing Professional Services since 2014. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Important "Security Onion" Files and Directories - Medium Zero Dollar Detection and Response Orchestration with n8n, Security Some of these refer to areas where data is stored, while others point to configuration files that can be modified to change how Security Onion interacts with various tools. 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. idstools may seem like it is ignoring your disabled rules request if you try to disable a rule that has flowbits set. These policy types can be found in /etc/nsm/rules/downloaded.rules. For example, if you had a web server you could include 80 and 443 tcp into an alias or in this case a port group. 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 If you were to add a search node, you would see its IP appear in both the minion and the search_node host groups. Hi @Trash-P4nda , I've just updated the documentation to be clearer. 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. If you are on a large network, you may need to do additional tuning like pinning processes to CPU cores. the rule is missing a little syntax, maybe try: alert icmp any any -> $HOME_NET any (msg:"ICMP Testing"; sid:1000001; rev:1;). In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. 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. c96 extractor. These non-manager nodes are referred to as salt minions. Open /etc/nsm/rules/local.rules using your favorite text editor. From the Command Line. AddingLocalRules Security-Onion-Solutions/security-onion Wiki Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. We created and maintain Security Onion, so we know it better than anybody else. This error now occurs in the log due to a change in the exception handling within Salts event module. Let's add a simple rule that will alert on the detection of a string in a tcp session. 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. Cannot retrieve contributors at this time. Start creating a file for your rule. Security Onion has Snort built in and therefore runs in the same instance. 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. How are they stored? Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. You can add Wazuh HIDS rules in /opt/so/rules/hids/local_rules.xml. Run rule-update (this will merge local.rules into downloaded.rules, update. There isnt much in here other than anywhere, dockernet, localhost and self. Basic snort rules syntax and usage [updated 2021] | Infosec Resources 1. In the image below, we can see how we define some rules for an eval node. The remainder of this section will cover the host firewall built into Security Onion. Write your rule, see Rules Format and save it. 2. Adding local rules in Security Onion is a rather straightforward process. In order to apply the threshold to all nodes, place the pillar in /opt/so/saltstack/local/pillar/global.sls. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others.
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