security onion local rules

This repository has been archived by the owner on Apr 16, 2021. 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 Revision 39f7be52. 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. 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 . For some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. Please update your bookmarks. Copyright 2023 Revision 39f7be52. 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. 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. MISP Rules. All node types are added to the minion host group to allow Salt communication. 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. Also ensure you run rule-update on the machine. 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 right click on the, You can learn more about snort and writing snort signatures from the. Some node types get their IP assigned to multiple host groups. 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. so-rule allows you to disable, enable, or modify NIDS rules. Run rule-update (this will merge local.rules into downloaded.rules, update. 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. Security Onion is an open-source and free Linux distribution for log management, enterprise security monitoring, and intrusion detection. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. If so, then tune the number of AF-PACKET workers for sniffing processes. Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. I've just updated the documentation to be clearer. Adding Your Own Rules . 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,. To unsubscribe from this group and stop receiving emails from it, send an email to security-onio.@googlegroups.com. 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. 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. You signed in with another tab or window. c96 extractor. The second only needs the $ character escaped to prevent bash from treating that as a variable. How are they parsed? Full Name. 4. Cleaning up local_rules.xml backup files older than 30 days. And when I check, there are no rules there. This writeup contains a listing of important Security Onion files and directories. To verify the Snort version, type in snort -Vand hit Enter. > > => I do not know how to do your guilde line. Revision 39f7be52. 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. Global pillar file: This is the pillar file that can be used to make global pillar assignments to the nodes. Open /etc/nsm/rules/local.rules using your favorite text editor. 3. 1. 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. Then tune your IDS rulesets. Download Security Onion 20110116. Saltstack states are used to ensure the state of objects on a minion. Check out our NIDS tuning video at https://youtu.be/1jEkFIEUCuI! There are two directories that contain the yaml files for the firewall configuration. 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. /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. Add the following to the minions sls file located at. Assuming you have Internet access, Security Onion will automatically update your NIDS rules on a daily basis. 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. Security Onion has Snort built in and therefore runs in the same instance. /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. to security-onion When I run 'rule-update' it give an error that there are no rules in /usr/local/lib/snort_dynamicrules. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. Revision 39f7be52. In a distributed deployment, the manager node controls all other nodes via salt. 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! Salt sls files are in YAML format. . Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. in Sguil? Our documentation has moved to https://securityonion.net/docs/. If you have multiple entries for the same SID, it will cause an error in salt resulting in all of the nodes in your grid to error out when checking in. The signature id (SID) must be unique. However, generating custom traffic to test the alert can sometimes be a challenge. Write your rule, see Rules Format and save it. 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. 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. Long-term you should only run the rules necessary for > your environment. 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. Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). Adding local rules in Security Onion is a rather straightforward process. Generate some traffic to trigger the alert. 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 section will cover both network firewalls outside of Security Onion and the host-based firewall built into Security Onion. Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. Default YARA rules are provided from Florian Roths signature-base Github repo at https://github.com/Neo23x0/signature-base. You can read more about this at https://redmine.openinfosecfoundation.org/issues/4377. /opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. idstools may seem like it is ignoring your disabled rules request if you try to disable a rule that has flowbits set. PFA local.rules. 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. 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. . Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. As you can see I have the Security Onion machine connected within the internal network to a hub. Finally, run so-strelka-restart to allow Strelka to pull in the new rules. Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. (Alternatively, you can press Ctrl+Alt+T to open a new shell.) 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. Security Onion is a free and open source platform for threat hunting, network security monitoring, and log management. From https://docs.saltstack.com/en/latest/: Salt is a core component of Security Onion 2 as it manages all processes on all nodes. 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. . After select all interfaces also ICMP logs not showing in sguil. 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). Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: Inside of /opt/so/saltstack/local/salt/strelka/rules/localrules, add your YARA rules. Tried as per your syntax, but still issue persists. On Thursday, June 15, 2017 at 5:06:51 PM UTC+5:30, Wes wrote: Is it simply not triggering, or causing an error? 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. These policy types can be found in /etc/nsm/rules/downloaded.rules. /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. 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. Logs. /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml defines custom port groups. 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. Diagnostic logs can be found in /opt/so/log/salt/. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. 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 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). Now that we have a signature that will generate alerts a little more selectively, we need to disable the original signature. Hi @Trash-P4nda , I've just updated the documentation to be clearer. 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. For example, suppose we want to disable SID 2100498. Have you tried something like this, in case you are not getting traffic to $HOME_NET? However, the exception is now logged. 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. 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. However, generating custom traffic to test the alert can sometimes be a challenge. 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. After viewing your redacted sostat it seems that the ICMP and UDP rules are triggering: Are you using SO with in a VM? Copyright 2023 Then tune your IDS rulesets. 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. These are the files that will need to be changed in order to customize nodes. There isnt much in here other than anywhere, dockernet, localhost and self. To unsubscribe from this group and stop receiving emails from it, send an email to. 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. /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 can learn more about snort and writing snort signatures from the Snort Manual. These non-manager nodes are referred to as salt minions. epic charting system training All alerts are viewable in Alerts, Dashboards, Hunt, and Kibana. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). 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 Check your syslog-ng configuration for the name of the local log source ("src" is used on SUSE systems). If you would like to create a rule yourself and use it with Suricata, this guide might be helpful. You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. 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 Please note! In order to apply the threshold to all nodes, place the pillar in /opt/so/saltstack/local/pillar/global.sls. Started by Doug Burks, and first released in 2009, Security Onion has. Salt is a new approach to infrastructure management built on a dynamic communication bus. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. Reboot into your new Security Onion installation and login using the username/password you specified in the previous step. > To unsubscribe from this topic . Previously, in the case of an exception, the code would just pass. Adding local rules in Security Onion is a rather straightforward process. 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. 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. We created and maintain Security Onion, so we know it better than anybody else. 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 Any pointers would be appreciated. When you purchase products and services from us, you're helping to fund development of Security Onion! 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). Data collection Examination It . 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. Salt is a core component of Security Onion 2 as it manages all processes on all nodes. 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. If you want to apply the threshold to a single node, place the pillar in /opt/so/saltstack/local/pillar/minions/.sls. If it is, then the most expedient measure may be to resolve the misconfiguration and then reinvestigate tuning. Here are some of the items that can be customized with pillar settings: Currently, the salt-minion service startup is delayed by 30 seconds. You signed in with another tab or window. 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. /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. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. Security Onion generates a lot of valuable information for you the second you plug it into a TAP or SPAN port. If you would like to pull in NIDS rules from a MISP instance, please see the MISP Rules section. If you built the rule correctly, then snort should be back up and running. Youll need to ensure the first of the two properly escapes any characters that would be interpreted by regex. By default, only the analyst hostgroup is allowed access to the nginx ports. This directory stores the firewall rules specific to your grid. . Once your rules and alerts are under control, then check to see if you have packet loss. 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. Minion pillar file: This is the minion specific pillar file that contains pillar definitions for that node. For more information about Salt, please see https://docs.saltstack.com/en/latest/. Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. Tracking. 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. Run so-rule without any options to see the help output: We can use so-rule to modify an existing NIDS rule. 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. =========================================================================Top 50 All time Sguil Events=========================================================================Totals GenID:SigID Signature1686 1:1000003 UDP Testing Rule646 1:1000001 ICMP Testing Rule2 1:2019512 ET POLICY Possible IP Check api.ipify.org1 1:2100498 GPL ATTACK_RESPONSE id check returned rootTotal2335, =========================================================================Last update=========================================================================. 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. Revision 39f7be52. 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. The server is also responsible for ruleset management. 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. 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. 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. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. Start creating a file for your rule. Add the following to the sensor minion pillar file located at. Try checking /var/log/nsm/hostname-interface/snortu-1.log for clues and please post the exact rule syntax you are attempting to use. In 2008, Doug Burks started working on Security Onion, a Linux distribution for intrusion detection, network security monitoring, and log management. 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. We've been teaching Security Onion classes and providing Professional Services since 2014. Salt sls files are in YAML format. /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. 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 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. 2. idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. You need to configure Security Onion to send syslog so that InsightIDR can ingest it. I went ahead and put in the below rules under /etc/nsm/local.rules and ran the rule-update command. Please note that Suricata 6 has a 64-character limitation on the IP field in a threshold. This wiki is no longer maintained. It is located at /opt/so/saltstack/local/pillar/global.sls. 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. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. 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. Security Onion is a intrusion detection and network monitoring tool. Identification. Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. Security Onion Layers Ubuntu based OS Snort, Suricata Snorby Bro Sguil Squert Copyright 2023 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) 1. Logs . The remainder of this section will cover the host 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. Security. 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. Use one of the following examples in your console/terminal window: sudo nano local.rules sudo vim 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. Files here should not be modified as changes would be lost during a code update.

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