Tracking. 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. Write your rule, see Rules Format and save it. Adding local rules in Security Onion is a rather straightforward process. Revision 39f7be52. Security Onion is a intrusion detection and network monitoring tool. If this is a distributed deployment, edit local.rules on your master server and it will replicate to your sensors. You can add Wazuh HIDS rules in /opt/so/rules/hids/local_rules.xml. Now that we have a signature that will generate alerts a little more selectively, we need to disable the original signature. It is located at /opt/so/saltstack/local/pillar/global.sls. This directory stores the firewall rules specific to your grid. Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. Youll need to ensure the first of the two properly escapes any characters that would be interpreted by regex. How are they parsed? 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. As you can see I have the Security Onion machine connected within the internal network to a hub. These non-manager nodes are referred to as salt minions. You signed in with another tab or window. 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 Any pointers would be appreciated. Cannot retrieve contributors at this time. 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? idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. Add the following to the minions sls file located at. Custom rules can be added to the local.rules file Rule threshold entries can . Revision 39f7be52. 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. /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 received this message because you are subscribed to the Google Groups "security-onion" group. You do not have permission to delete messages in this group, Either email addresses are anonymous for this group or you need the view member email addresses permission to view the original message. For example, suppose that we want to modify SID 2100498 and replace any instances of returned root with returned root test. Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. Interested in discussing how our products and services can help your organization? For example, the following threshold IP exceeds the 64-character limit: This results in the following error in the Suricata log: The solution is to break the ip field into multiple entries like this: A suppression rule allows you to make some finer grained decisions about certain rules without the onus of rewriting them. Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. When editing these files, please be very careful to respect YAML syntax, especially whitespace. Security Onion. . There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). 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, . "; 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). The error can be ignored as it is not an indication of any issue with the minions. 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). the rule is missing a little syntax, maybe try: alert icmp any any -> $HOME_NET any (msg:"ICMP Testing"; sid:1000001; rev:1;). 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. (Alternatively, you can press Ctrl+Alt+T to open a new shell.) 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 some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. 7.2. You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. . 1. If it is, then the most expedient measure may be to resolve the misconfiguration and then reinvestigate tuning. 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). You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. 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. The second only needs the $ character escaped to prevent bash from treating that as a variable. 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. Give feedback. 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. Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: Paste the rule. From https://docs.saltstack.com/en/latest/: Salt is a core component of Security Onion 2 as it manages all processes on all nodes. Adding Your Own Rules . If you right click on the, You can learn more about snort and writing snort signatures from the. Salt is a new approach to infrastructure management built on a dynamic communication bus. Any definitions made here will override anything defined in other pillar files, including global. Saltstack states are used to ensure the state of objects on a minion. 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. This directory contains the default firewall rules. This repository has been archived by the owner on Apr 16, 2021. Before You Begin. Security Onion has Snort built in and therefore runs in the same instance. . Manager of Support and Professional Services. Security Onion a free and open platform for intrusion detection, enterprise security monitoring, and log management. 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. 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,. 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. The territories controlled by the ROC consist of 168 islands, with a combined area of 36,193 square . 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. Copyright 2023 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. Reboot into your new Security Onion installation and login using the username/password you specified in the previous step. /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml defines custom port groups. PFA local.rules. In syslog-ng, the following configuration forwards all local logs to Security Onion. 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 Minion pillar file: This is the minion specific pillar file that contains pillar definitions for that node. Enter the following sample in a line at a time. For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. That's what we'll discuss in this section. and dont forget that the end is a semicolon and not a colon. There isnt much in here other than anywhere, dockernet, localhost and self. 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. Security Onion is a platform that allows you to monitor your network for security alerts. https://docs.securityonion.net/en/2.3/local-rules.html?#id1. If you try to disable the first two rules without disabling the third rule (which has flowbits:isset,ET.MSSQL) the third rule could never fire due to one of the first two rules needing to fire first. You may want to bump the SID into the 90,000,000 range and set the revision to 1. If you would like to create a rule yourself and use it with Suricata, this guide might be helpful. Generate some traffic to trigger the alert. As shown above, we edit the minion pillar and add the SID to the idstools - sids - disabled section. When I run sostat. 5. In order to apply the threshold to all nodes, place the pillar in /opt/so/saltstack/local/pillar/global.sls. Local pillar file: This is the pillar file under /opt/so/saltstack/local/pillar/. There may be entire categories of rules that you want to disable first and then look at the remaining enabled rules to see if there are individual rules that can be disabled. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. How are they stored? The county seat is in Evansville. According to NIST, which step in the digital forensics process involves drawing conclusions from data? Security Onion generates a lot of valuable information for you the second you plug it into a TAP or SPAN port. The server is also responsible for ruleset management. Please note that Suricata 6 has a 64-character limitation on the IP field in a threshold. Check your syslog-ng configuration for the name of the local log source ("src" is used on SUSE systems). 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. 41 - Network Segmentation, VLANs, and Subnets. Revision 39f7be52. epic charting system training Open /etc/nsm/rules/local.rules using your favorite text editor. Copyright 2023 In 2008, Doug Burks started working on Security Onion, a Linux distribution for intrusion detection, network security monitoring, and log management. Port groups are a way of grouping together ports similar to a firewall port/service alias. 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). Salt sls files are in YAML format. Hi @Trash-P4nda , I've just updated the documentation to be clearer. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Backing up current local_rules.xml file. Logs. 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. In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. It incorporates NetworkMiner, CyberChef, Squert, Sguil, Wazuh, Bro, Suricata, Snort, Kibana, Logstash, Elasticsearch, and numerous other security onion tools. Backing up current downloaded.rules file before it gets overwritten. If you pivot from that alert to the corresponding pcap you can verify the payload we sent. This writeup contains a listing of important Security Onion files and directories. Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: Default pillar file: This is the pillar file located under /opt/so/saltstack/default/pillar/. The signature id (SID) must be unique. If you cant run so-rule, you can modify the configuration manually in the manager pillar file at /opt/so/saltstack/local/pillar/minions/_.sls (where is manager, managersearch, standalone, or eval depending on the manager type that was chosen during install). 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. Open /etc/nsm/rules/local.rules using your favorite text editor. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. And when I check, there are no rules there. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. You could try testing a rule . so-rule allows you to disable, enable, or modify NIDS rules. Modifying these values outside of so-allow or so-firewall could lead to problems accessing your existing hosts. Security Onion uses idstools to download new signatures every night and process them against a set list of user generated configurations. Long-term you should only run the rules necessary for > your environment. Assuming you have Internet access, Security Onion will automatically update your NIDS rules on a daily basis. Inside of /opt/so/saltstack/local/salt/strelka/rules/localrules, add your YARA rules. You signed in with another tab or window. 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. A tag already exists with the provided branch name. 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. 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. Full Name. Finally, run so-strelka-restart to allow Strelka to pull in the new rules. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. 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) Global pillar file: This is the pillar file that can be used to make global pillar assignments to the nodes. When configuring network firewalls for distributed deployments, youll want to ensure that nodes can connect as shown below. 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. Introduction Adding local rules in Security Onion is a rather straightforward process. Naming convention: The collection of server processes has a server name separate from the hostname of the box. 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. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you dont want your network sensors to process. More information on each of these topics can be found in this section. Our documentation has moved to https://securityonion.net/docs/. Logs . . A. One thing you can do with it (and the one that most people are interested in) is to configure it for IDS mode. I've just updated the documentation to be clearer. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. 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. 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. 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. For example, if you include a bad custom snort rule with incorrect syntax, the snort engine will fail . 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. I have 3 simple use cases (1) Detect FTP Connection to our public server 129.x.x.x (2) Detect SSH Connection attempts (3) Detect NMAP scan. The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. . 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. Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. I have had issues with Sguil when working with a snapshot and have not found a fix yet.. On Monday, June 26, 2017 at 8:28:44 PM UTC+5:30, KennyWap wrote: security-onion+unsubscribe@googlegroups.com, https://groups.google.com/group/security-onion. See above for suppress examples. This wiki is no longer maintained. 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. Find Age Regression Discord servers and make new friends! Started by Doug Burks, and first released in 2009, Security Onion has. Was this translation helpful? 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. . You can use salts test.ping to verify that all your nodes are up: Similarly, you can use salts cmd.run to execute a command on all your nodes at once. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. 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. 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. For example, suppose we want to disable SID 2100498. 3. to security-onion > > My rules is as follows: > > alert icmp any any -> (msg:"ICMP Testing"; sid:1000001; rev:1:) the rule is missing a little syntax, maybe try: alert icmp any any ->. If so, then tune the number of AF-PACKET workers for sniffing processes. If you would like to pull in NIDS rules from a MISP instance, please see: Add the following to the sensor minion pillar file located at. 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. Have you tried something like this, in case you are not getting traffic to $HOME_NET? 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. idstools may seem like it is ignoring your disabled rules request if you try to disable a rule that has flowbits set. 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. Data collection Examination 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. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. Our products include both the Security Onion software and specialized hardware appliances that are built and tested to run Security Onion. In this file, the idstools section has a modify sub-section where you can add your modifications. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. 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. 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. This will add the host group to, Add the desired IPs to the host group. You can find the latest version of this page at: https://securityonion.net/docs/AddingLocalRules. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. This was implemented to avoid some issues that we have seen regarding Salt states that used the ip_interfaces grain to grab the management interface IP. Escalate local privileges to root level. 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. We created and maintain Security Onion, so we know it better than anybody else. /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. Please keep this value below 90 seconds otherwise systemd will reach timeout and terminate the service. This way, you still have the basic ruleset, but the situations in which they fire are altered. Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. Files here should not be modified as changes would be lost during a code update. Security Onion is a free and open source platform for threat hunting, network security monitoring, and log management. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. However, generating custom traffic to test the alert can sometimes be a challenge. 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 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. Security Deposit Reliable Up to $5,000 Payments Higher rents as supported by comparable rents Higher Voucher Payment Standards (VPS) 10/1/2021 Signing Bonus 1 - Bedroom = $893 to $1,064 2 - Bedroom = $1,017 to $1,216 3 - Bedroom = $1,283 to $1,530 4 - Bedroom = $1,568 to $1,872 5 - Bedroom = $1,804 to $2,153 6 - Bedroom = $2,038 to . To get the best performance out of Security Onion, youll want to tune it for your environment. /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.

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