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 includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. Introduction Adding local rules in Security Onion is a rather straightforward process. /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. This writeup contains a listing of important Security Onion files and directories. /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. 1. Please update your bookmarks. 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. Revision 39f7be52. 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! Then tune your IDS rulesets. If you are on a large network, you may need to do additional tuning like pinning processes to CPU cores. Youll need to ensure the first of the two properly escapes any characters that would be interpreted by regex. If it is, then the most expedient measure may be to resolve the misconfiguration and then reinvestigate tuning. Adding local rules in Security Onion is a rather straightforward process. All alerts are viewable in Alerts, Dashboards, Hunt, and Kibana. Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. Copyright 2023 Security Onion is a intrusion detection and network monitoring tool. Manager of Support and Professional Services. 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 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. Cannot retrieve contributors at this time. 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. For a Security Onion client, you should dedicate at least 2GB RAM, but ideally 4GB if possible. Default pillar file: This is the pillar file located under /opt/so/saltstack/default/pillar/. > > => I do not know how to do your guilde line. 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 The error can be ignored as it is not an indication of any issue with the minions. 3. Any definitions made here will override anything defined in other pillar files, including global. 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. 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. 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. Copyright 2023 Backing up current local_rules.xml file. It is now read-only. As you can see I have the Security Onion machine connected within the internal network to a hub. It is located at /opt/so/saltstack/local/pillar/global.sls. For more information about Salt, please see https://docs.saltstack.com/en/latest/. This is located at /opt/so/saltstack/local/pillar/minions/.sls. 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 . If this is a distributed deployment, edit local.rules on your master server and it will replicate to your sensors. /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml defines custom port groups. You need to configure Security Onion to send syslog so that InsightIDR can ingest it. Security Onion Layers Ubuntu based OS Snort, Suricata Snorby Bro Sguil Squert Can anyone tell me > > > > what I've done wrong please? 4. 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). Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. 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. 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. The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. At those times, it can be useful to query the database from the commandline. Previously, in the case of an exception, the code would just pass. MISP Rules. Security Onion a free and open platform for intrusion detection, enterprise security monitoring, and log management. Salt is a new approach to infrastructure management built on a dynamic communication bus. 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. Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. PFA local.rules. When you purchase products and services from us, you're helping to fund development of Security Onion! https://securityonion.net/docs/AddingLocalRules. Finally, run so-strelka-restart to allow Strelka to pull in the new rules. 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. the rule is missing a little syntax, maybe try: alert icmp any any -> $HOME_NET any (msg:"ICMP Testing"; sid:1000001; rev:1;). Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Modifying these values outside of so-allow or so-firewall could lead to problems accessing your existing hosts. Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. Security Onion uses idstools to download new signatures every night and process them against a set list of user generated configurations. The county seat is in Evansville. As shown above, we edit the minion pillar and add the SID to the idstools - sids - disabled section. On Thursday, June 15, 2017 at 5:06:51 PM UTC+5:30, Wes wrote: Is it simply not triggering, or causing an error? 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. 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). 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. Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: Paste the rule. How are they parsed? There are two directories that contain the yaml files for the firewall configuration. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. To add local YARA rules, create a directory in /opt/so/saltstack/local/salt/strelka/rules, for example localrules. "; 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). Security Onion. Revision 39f7be52. In this file, the idstools section has a modify sub-section where you can add your modifications. Tried as per your syntax, but still issue persists. Between Zeek logs, alert data from Suricata, and full packet capture from Stenographer, you have enough information to begin identifying areas of interest and making positive changes to your security stance. 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. Then tune your IDS rulesets. 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 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. (Alternatively, you can press Ctrl+Alt+T to open a new shell.) Assuming you have Internet access, Security Onion will automatically update your NIDS rules on a daily basis. Any pointers would be appreciated. We created and maintain Security Onion, so we know it better than anybody else. Any line beginning with "#" can be ignored as it is a comment. 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. Logs. so-rule allows you to disable, enable, or modify NIDS rules. There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). Identification. 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. In 2008, Doug Burks started working on Security Onion, a Linux distribution for intrusion detection, network security monitoring, and log management. Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. 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. I've just updated the documentation to be clearer. For example, if you include a bad custom snort rule with incorrect syntax, the snort engine will fail . These policy types can be found in /etc/nsm/rules/downloaded.rules. Boot the ISO and run through the installer. To configure syslog for Security Onion: Stop the Security Onion service. Inside of /opt/so/saltstack/local/salt/strelka/rules/localrules, add your YARA rules. A. If you were to add a search node, you would see its IP appear in both the minion and the search_node host groups. For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. 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. Where is it that you cannot view them? Before You Begin. 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. Data collection Examination However, generating custom traffic to test the alert can sometimes be a challenge. https://docs.securityonion.net/en/2.3/local-rules.html?#id1. 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. 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. Saltstack states are used to ensure the state of objects on a minion. 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. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. In the image below, we can see how we define some rules for an eval node. See above for suppress examples. For more information, please see https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. When you run so-allow or so-firewall, it modifies this file to include the IP provided in the proper hostgroup. In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. These non-manager nodes are referred to as salt minions. This will add the host group to, Add the desired IPs to the host group. idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. For example, suppose we want to disable SID 2100498. 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. and dont forget that the end is a semicolon and not a colon. Hi @Trash-P4nda , I've just updated the documentation to be clearer. Copyright 2023 All the following will need to be run from the manager. Backups; Docker; DNS Anomaly Detection; Endgame; ICMP Anomaly Detection; Jupyter Notebook; Machine Learning; Adding a new disk; PCAPs for Testing; Removing a Node; Syslog Output; UTC and Time Zones; Utilities. Find Age Regression Discord servers and make new friends! 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,. Check out our NIDS tuning video at https://youtu.be/1jEkFIEUCuI! 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.
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