so-rule allows you to disable, enable, or modify NIDS rules. All alerts are viewable in Alerts, Dashboards, Hunt, and Kibana. Security. 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. Find Age Regression Discord servers and make new friends! Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: However, generating custom traffic to test the alert can sometimes be a challenge. 1. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. Check out our NIDS tuning video at https://youtu.be/1jEkFIEUCuI! To unsubscribe from this group and stop receiving emails from it, send an email to. You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. In this file, the idstools section has a modify sub-section where you can add your modifications. 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. 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. Full Name. (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NIDS Rules in Security Onion Security Onion 7.5K subscribers 48 Dislike Share 1,465 views Dec 22, 2021 This video has been archived as of January 2022 - the latest. This way, you still have the basic ruleset, but the situations in which they fire are altered. 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. 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, More information on each of these topics can be found in this section. Any definitions made here will override anything defined in other pillar files, including global. 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. After select all interfaces also ICMP logs not showing in sguil. Salt sls files are in YAML format. Security Onion generates a lot of valuable information for you the second you plug it into a TAP or SPAN port. Backing up current downloaded.rules file before it gets overwritten. If you need to increase this delay, it can be done using the salt:minion:service_start_delay pillar. If this is a distributed deployment, edit local.rules on your master server and it will replicate to your sensors. We created and maintain Security Onion, so we know it better than anybody else. Files here should not be modified as changes would be lost during a code update. 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. Please note that Suricata 6 has a 64-character limitation on the IP field in a threshold. Logs. 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. 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. Introduction Adding local rules in Security Onion is a rather straightforward process. Salt is a core component of Security Onion 2 as it manages all processes on all nodes. Then tune your IDS rulesets. To verify the Snort version, type in snort -Vand hit Enter. Backing up current local_rules.xml file. For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. These non-manager nodes are referred to as salt minions. In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. 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. The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. MISP Rules. 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. 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. 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. This will add the host group to, Add the desired IPs to the host group. . Next, run so-yara-update to pull down the rules. 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. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. If you would like to pull in NIDS rules from a MISP instance, please see: 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. Interested in discussing how our products and services can help your organization? Cannot retrieve contributors at this time. Saltstack states are used to ensure the state of objects on a minion. As you can see I have the Security Onion machine connected within the internal network to a hub. 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. Assuming you have Internet access, Security Onion will automatically update your NIDS rules on a daily basis. If you would like to create a rule yourself and use it with Suricata, this guide might be helpful. 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. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. PFA local.rules. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. 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. Default pillar file: This is the pillar file located under /opt/so/saltstack/default/pillar/. The error can be ignored as it is not an indication of any issue with the minions. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Generate some traffic to trigger the alert. 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 may want to bump the SID into the 90,000,000 range and set the revision to 1. https://docs.securityonion.net/en/2.3/local-rules.html?#id1. If it is, then the most expedient measure may be to resolve the misconfiguration and then reinvestigate tuning. 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. This wiki is no longer maintained. 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. Adding local rules in Security Onion is a rather straightforward process. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. According to NIST, which step in the digital forensics process involves drawing conclusions from data? After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. 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. 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. When you run so-allow or so-firewall, it modifies this file to include the IP provided in the proper hostgroup. Port groups are a way of grouping together ports similar to a firewall port/service alias. 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. Logs . If you were to add a search node, you would see its IP appear in both the minion and the search_node host groups. 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. One thing you can do with it (and the one that most people are interested in) is to configure it for IDS mode. This directory stores the firewall rules specific to your grid. Here are some of the items that can be customized with pillar settings: Currently, the salt-minion service startup is delayed by 30 seconds. 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). Hi @Trash-P4nda , I've just updated the documentation to be clearer. 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. 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. 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) A tag already exists with the provided branch name. If you right click on the, You can learn more about snort and writing snort signatures from the. . "; 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). 2. Of course, the target IP address will most likely be different in your environment: destination d_tcp { tcp("192.168.3.136" port(514)); }; log { 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. Now that we have a signature that will generate alerts a little more selectively, we need to disable the original signature. 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. It is now read-only. > > > > > > > > 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. However, generating custom traffic to test the alert can sometimes be a challenge. Security Onion Solutions, LLC is the creator and maintainer of Security Onion, a free and open platform for threat hunting, network security monitoring, and log management. 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. Was this translation helpful? /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. Revision 39f7be52. However, generating custom traffic to test the alert can sometimes be a challenge. How are they stored? Have you tried something like this, in case you are not getting traffic to $HOME_NET? Copyright 2023 Write your rule, see Rules Format and save it. /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. 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? 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. Please note! 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. 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. 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). Please review the Salt section to understand pillars and templates. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. 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. There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). Security Onion a free and open platform for intrusion detection, enterprise security monitoring, and log management. How are they parsed? Security Onion Solutions, LLC is the creator and maintainer of Security Onion, a free and open platform for threat hunting, network security monitoring, and log management. That's what we'll discuss in this section. Security Onion. 5. 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. 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. All the following will need to be run from the manager. . Revision 39f7be52. 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 When I run sostat. The territories controlled by the ROC consist of 168 islands, with a combined area of 36,193 square . Give feedback. For example, consider the following rules that reference the ET.MSSQL flowbit. Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. Adding Your Own Rules . Add the following to the sensor minion pillar file located at. See above for suppress examples. Please provide the output of sostat-redacted, attaching as a plain text file, or by using a service like Pastebin.com. Are you sure you want to create this branch? Before You Begin. By default, only the analyst hostgroup is allowed access to the nginx ports. 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). To configure syslog for Security Onion: Stop the Security Onion service. Any line beginning with "#" can be ignored as it is a comment. 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. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. 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. This writeup contains a listing of important Security Onion files and directories. At those times, it can be useful to query the database from the commandline. You can use salts test.ping to verify that all your nodes are up: Similarly, you can use salts cmd.run to execute a command on all your nodes at once. =========================================================================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=========================================================================.
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