security onion local rules

. Security Onion is a free and open source platform for threat hunting, network security monitoring, and log management. PFA local.rules. sigs.securityonion.net (Signature files for Security Onion containers) ghcr.io (Container downloads) rules.emergingthreatspro.com (Emerging Threats IDS rules) rules.emergingthreats.net (Emerging Threats IDS open rules) www.snort.org (Paid Snort Talos ruleset) github.com (Strelka and Sigma rules updates) Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you don't want your network sensors to process. In syslog-ng, the following configuration forwards all local logs to Security Onion. Security Onion. This directory stores the firewall rules specific to your grid. Also ensure you run rule-update on the machine. /opt/so/saltstack/local/salt/firewall/assigned_hostgroups.local.map.yaml is where host group and port group associations would be made to create custom host group and port group assignements that would apply to all nodes of a certain role type in the grid. You may want to bump the SID into the 90,000,000 range and set the revision to 1. 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. These are the files that will need to be changed in order to customize nodes. Previously, in the case of an exception, the code would just pass. ELSA? Finally, run so-strelka-restart to allow Strelka to pull in the new rules. 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. 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. 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. However, generating custom traffic to test the alert can sometimes be a challenge. You need to configure Security Onion to send syslog so that InsightIDR can ingest it. It's simple enough to run in small environments without many issues and allows advanced users to deploy distributed systems that can be used in network enterprise type environments. 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. Check out our NIDS tuning video at https://youtu.be/1jEkFIEUCuI! It is located at /opt/so/saltstack/local/pillar/global.sls. and dont forget that the end is a semicolon and not a colon. The server is also responsible for ruleset management. Beta https://securityonion.net/docs/AddingLocalRules. This is located at /opt/so/saltstack/local/pillar/minions/.sls. To add local YARA rules, create a directory in /opt/so/saltstack/local/salt/strelka/rules, for example localrules. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. 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. If you built the rule correctly, then snort should be back up and running. Any definitions made here will override anything defined in other pillar files, including global. 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. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. to security-onion When I run 'rule-update' it give an error that there are no rules in /usr/local/lib/snort_dynamicrules. 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. 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? 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! Revision 39f7be52. 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. When you purchase products and services from us, you're helping to fund development of Security Onion! 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. We offer both training and support for Security Onion. This repository has been archived by the owner on Apr 16, 2021. Now that we have a signature that will generate alerts a little more selectively, we need to disable the original signature. These policy types can be found in /etc/nsm/rules/downloaded.rules. 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. Inside of /opt/so/saltstack/local/salt/strelka/rules/localrules, add your YARA rules. Security Onion offers the following choices for rulesets to be used by Suricata. When I run sostat. /opt/so/saltstack/local/salt/firewall/hostgroups.local.yaml is where many default named hostgroups get populated with IPs that are specific to your environment. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. Add the following to the minions sls file located at. jq; so-allow; so-elastic-auth; so . For more information about Salt, please see https://docs.saltstack.com/en/latest/. A. In a distributed deployment, the manager node controls all other nodes via salt. Reboot into your new Security Onion installation and login using the username/password you specified in the previous step. Check your syslog-ng configuration for the name of the local log source ("src" is used on SUSE systems). 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. Youll need to ensure the first of the two properly escapes any characters that would be interpreted by regex. idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. https://docs.securityonion.net/en/2.3/local-rules.html?#id1. How are they stored? 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. 3. According to NIST, which step in the digital forensics process involves drawing conclusions from data? Enter the following sample in a line at a time. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml defines custom port groups. 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. Please keep this value below 90 seconds otherwise systemd will reach timeout and terminate the service. 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. First off, I'll briefly explain security onion security Onion is the leading open source operating system for network security monitoring, intrusion detection, log management and threat hunting. Ingest. 2. This first sub-section will discuss network firewalls outside of Security Onion. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. You can do so via the command line using curl: Alternatively, you could also test for additional hits with a utility called tmNIDS, running the tool in interactive mode: If everything is working correctly, you should see a corresponding alert (GPL ATTACK_RESPONSE id check returned root) in Alerts, Dashboards, Hunt, or Kibana. For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. 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. To get the best performance out of Security Onion, youll want to tune it for your environment. If you want to apply the threshold to a single node, place the pillar in /opt/so/saltstack/local/pillar/minions/.sls. Security Onion Layers Ubuntu based OS Snort, Suricata Snorby Bro Sguil Squert There are many ways to achieve age regression, but the three primary methods are: Botox. This will add the host group to, Add the desired IPs to the host group. Start creating a file for your rule. It incorporates NetworkMiner, CyberChef, Squert, Sguil, Wazuh, Bro, Suricata, Snort, Kibana, Logstash, Elasticsearch, and numerous other security onion tools. Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. 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. 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. . This section will cover both network firewalls outside of Security Onion and the host-based firewall built into Security Onion. 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. And when I check, there are no rules there. 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. More information on each of these topics can be found in this section. If you would like to create a rule yourself and use it with Suricata, this guide might be helpful. Logs . For example, if you want to modify SID 2009582 and change $EXTERNAL_NET to $HOME_NET: The first string is a regex pattern, while the second is just a raw value. 7.2. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. This directory contains the default firewall rules. Global pillar file: This is the pillar file that can be used to make global pillar assignments to the nodes. Modifying these values outside of so-allow or so-firewall could lead to problems accessing your existing hosts. Custom rules can be added to the local.rules file Rule threshold entries can . You can learn more about scapy at secdev.org and itgeekchronicles.co.uk. When editing these files, please be very careful to respect YAML syntax, especially whitespace. 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. 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. However, generating custom traffic to test the alert can sometimes be a challenge. Copyright 2023 "; 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). For some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. Write your rule, see Rules Format and save it. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. Give feedback. 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. The second only needs the $ character escaped to prevent bash from treating that as a variable. Once your rules and alerts are under control, then check to see if you have packet loss. 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. Try checking /var/log/nsm/hostname-interface/snortu-1.log for clues and please post the exact rule syntax you are attempting to use. Before You Begin. In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. in Sguil? Default pillar file: This is the pillar file located under /opt/so/saltstack/default/pillar/. Copyright 2023 Revision 39f7be52. Please note that Suricata 6 has a 64-character limitation on the IP field in a threshold. Security Onion is a intrusion detection and network monitoring tool. 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. 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. lawson cedars. 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. 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. Salt is a new approach to infrastructure management built on a dynamic communication bus. Tracking. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Assuming you have Internet access, Security Onion will automatically update your NIDS rules on a daily basis. 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. 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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. > > > > > > > > Cheers, Andi > > > > > > > > > > -- Mit besten Gren Shane Castle > > > > -- > Mit besten Gren > Shane Castle > > -- > You received this message because you are subscribed to a topic in the > Google Groups "security-onion" group. . Then tune your IDS rulesets. Use one of the following examples in your console/terminal window: sudo nano local.rules sudo vim local.rules. 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. 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. 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. If you right click on the, You can learn more about snort and writing snort signatures from the. In the image below, we can see how we define some rules for an eval node. However, generating custom traffic to test the alert can sometimes be a challenge. Let's add a simple rule that will alert on the detection of a string in a tcp session. You signed in with another tab or window. All the following will need to be run from the manager. Interested in discussing how our products and services can help your organization? The error can be ignored as it is not an indication of any issue with the minions. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. Backing up current local_rules.xml file. Default YARA rules are provided from Florian Roths signature-base Github repo at https://github.com/Neo23x0/signature-base. . Any line beginning with "#" can be ignored as it is a comment. /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. 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. Are you sure you want to create this branch? 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 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 However, generating custom traffic to test the alert can sometimes be a challenge. After viewing your redacted sostat it seems that the ICMP and UDP rules are triggering: Are you using SO with in a VM? This is an advanced case and you most likely wont never need to modify these files. /opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. 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. 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. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. 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. If so, then tune the number of AF-PACKET workers for sniffing processes. Started by Doug Burks, and first released in 2009, Security Onion has. Naming convention: The collection of server processes has a server name separate from the hostname of the box. Salt sls files are in YAML format. Security Onion is a platform that allows you to monitor your network for security alerts. Security Onion a free and open platform for intrusion detection, enterprise security monitoring, and log management. In this file, the idstools section has a modify sub-section where you can add your modifications. Copyright 2023 While Vanderburgh County was the seventh-largest county in 2010 population with 179,703 people, it is also the eighth-smallest county in area in Indiana and the smallest in southwestern Indiana, covering only 236 square miles (610 km2). . Download Security Onion 20110116. The territories controlled by the ROC consist of 168 islands, with a combined area of 36,193 square . You can read more about this at https://redmine.openinfosecfoundation.org/issues/4377. 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 . 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 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. We can start by listing any currently disabled rules: Once that completes, we can then verify that 2100498 is now disabled with so-rule disabled list: Finally, we can check that 2100498 is commented out in /opt/so/rules/nids/all.rules: If you cant run so-rule, then you can modify configuration manually. Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. Long-term you should only run the rules necessary for > your environment. You signed in with another tab or window. Cannot retrieve contributors at this time. 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. Security Onion uses idstools to download new signatures every night and process them against a set list of user generated configurations. On Thursday, June 15, 2017 at 5:06:51 PM UTC+5:30, Wes wrote: Is it simply not triggering, or causing an error? Generate some traffic to trigger the alert. 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. Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. 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. (Alternatively, you can press Ctrl+Alt+T to open a new shell.) You signed in with another tab or window. Then tune your IDS rulesets. Copyright 2023 Backing up current downloaded.rules file before it gets overwritten. To configure syslog for Security Onion: Stop the Security Onion service. If you have Internet access and want to have so-yara-update pull YARA rules from a remote Github repo, copy /opt/so/saltstack/local/salt/strelka/rules/, and modify repos.txt to include the repo URL (one per line). Copyright 2023 At those times, it can be useful to query the database from the commandline. 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,. It is now read-only. This way, you still have the basic ruleset, but the situations in which they fire are altered. To enable or disable SIDs for Suricata, the Salt idstools pillar can be used in the minion pillar file (/opt/so/saltstack/local/pillar/minions/_.sls). We created and maintain Security Onion, so we know it better than anybody else. For more information, please see https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. If you are on a large network, you may need to do additional tuning like pinning processes to CPU cores. Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: Run so-rule without any options to see the help output: We can use so-rule to modify an existing NIDS rule. 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. For example, suppose we want to disable SID 2100498. Revision 39f7be52. In order to apply the threshold to all nodes, place the pillar in /opt/so/saltstack/local/pillar/global.sls. 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. We've been teaching Security Onion classes and providing Professional Services since 2014. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. For example, if you include a bad custom snort rule with incorrect syntax, the snort engine will fail . All node types are added to the minion host group to allow Salt communication. If it is, then the most expedient measure may be to resolve the misconfiguration and then reinvestigate tuning. Escalate local privileges to root level. These non-manager nodes are referred to as salt minions. Security Onion generates a lot of valuable information for you the second you plug it into a TAP or SPAN port. epic charting system training 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 From https://docs.saltstack.com/en/latest/: Salt is a core component of Security Onion 2 as it manages all processes on all nodes. > > => I do not know how to do your guilde line. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. A tag already exists with the provided branch name. Salt is a core component of Security Onion 2 as it manages all processes on all nodes. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. By default, only the analyst hostgroup is allowed access to the nginx ports. 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. That's what we'll discuss in this section. 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/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.

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