Adding local rules in Security Onion is a rather straightforward process. This wiki is no longer maintained. You need to configure Security Onion to send syslog so that InsightIDR can ingest it. (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NIDS Rules in Security Onion Security Onion 7.5K subscribers 48 Dislike Share 1,465 views Dec 22, 2021 This video has been archived as of January 2022 - the latest. 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 { Naming convention: The collection of server processes has a server name separate from the hostname of the box. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. If . 2. IPS Policy 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, All alerts are viewable in Alerts, Dashboards, Hunt, and Kibana. Next, run so-yara-update to pull down the rules. Copyright 2023 This is an advanced case and you most likely wont never need to modify these files. When you run so-allow or so-firewall, it modifies this file to include the IP provided in the proper hostgroup. Identification. The error can be ignored as it is not an indication of any issue with the minions. Write your rule, see Rules Format and save it. You may want to bump the SID into the 90,000,000 range and set the revision to 1. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. Youll need to ensure the first of the two properly escapes any characters that would be interpreted by regex. Copyright 2023 This first sub-section will discuss network firewalls outside of Security Onion. 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. 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. Please provide the output of sostat-redacted, attaching as a plain text file, or by using a service like Pastebin.com. For more information, please see https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. Files here should not be modified as changes would be lost during a code update. 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. This section will cover both network firewalls outside of Security Onion and the host-based firewall built into Security Onion. This writeup contains a listing of important Security Onion files and directories. This way, you still have the basic ruleset, but the situations in which they fire are altered. Custom rules can be added to the local.rules file Rule threshold entries can . The territories controlled by the ROC consist of 168 islands, with a combined area of 36,193 square . The county seat is in Evansville. 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. The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. When I run sostat. Please keep this value below 90 seconds otherwise systemd will reach timeout and terminate the service. You can learn more about snort and writing snort signatures from the Snort Manual. Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. This will add the host group to, Add the desired IPs to the host group. 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. Revision 39f7be52. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. 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. Please note! 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 Now that we have a signature that will generate alerts a little more selectively, we need to disable the original signature. 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. In a distributed deployment, the manager node controls all other nodes via salt. 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. 7.2. 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. In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. 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. 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. Check your syslog-ng configuration for the name of the local log source ("src" is used on SUSE systems). Add the following to the minions sls file located at. Our instructors are the only Security Onion Certified Instructors in the world and our course material is the only authorized training material for Security Onion. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. You can find the latest version of this page at: https://securityonion.net/docs/AddingLocalRules. It incorporates NetworkMiner, CyberChef, Squert, Sguil, Wazuh, Bro, Suricata, Snort, Kibana, Logstash, Elasticsearch, and numerous other security onion tools. 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. You can do the reverse unit conversion from MPa to psi, or enter any two units below:LED MSI Optix G242 24 inch IPS Gaming Monitor - Full HD - 144Hz Refresh Rate - 1ms Response time - Adaptive Sync for Esports (9S6-3BA41T-039) LED MSI OPTIX G272 Gaming Monitor 27" FHD IPS 144HZ 1MS Adaptive Sync (9S6-3CB51T-036) LG 27 FHD IPS 1ms 240Hz G . Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. lawson cedars. You signed in with another tab or window. When editing these files, please be very careful to respect YAML syntax, especially whitespace. If you need to increase this delay, it can be done using the salt:minion:service_start_delay pillar. You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. In many of the use cases below, we are providing the ability to modify a configuration file by editing either the global or minion pillar file. Default pillar file: This is the pillar file located under /opt/so/saltstack/default/pillar/. It . Run rule-update (this will merge local.rules into downloaded.rules, update. A. However, generating custom traffic to test the alert can sometimes be a challenge. Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. Escalate local privileges to root level. Copyright 2023 Ingest. Adding Your Own Rules . the rule is missing a little syntax, maybe try: alert icmp any any -> $HOME_NET any (msg:"ICMP Testing"; sid:1000001; rev:1;). 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. Then tune your IDS rulesets. Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. 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. Let's add a simple rule that will alert on the detection of a string in a tcp session. That's what we'll discuss in this section. 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). MISP Rules. For example, suppose we want to disable SID 2100498. Modifying these values outside of so-allow or so-firewall could lead to problems accessing your existing hosts. PFA local.rules. Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. 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. 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 . 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. The signature id (SID) must be unique. Our products include both the Security Onion software and specialized hardware appliances that are built and tested to run Security Onion. 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. As you can see I have the Security Onion machine connected within the internal network to a hub. Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. 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. in Sguil? Minion pillar file: This is the minion specific pillar file that contains pillar definitions for that node. Security Onion is a intrusion detection and network monitoring tool. For example, consider the following rules that reference the ET.MSSQL flowbit. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. To unsubscribe from this group and stop receiving emails from it, send an email to. Security Onion a free and open platform for intrusion detection, enterprise security monitoring, and log management. . You may want to bump the SID into the 90,000,000 range and set the revision to 1. If you would like to pull in NIDS rules from a MISP instance, please see the MISP Rules section. After viewing your redacted sostat it seems that the ICMP and UDP rules are triggering: Are you using SO with in a VM? . Manager of Support and Professional Services. Security Onion. Finally, run so-strelka-restart to allow Strelka to pull in the new rules. You received this message because you are subscribed to the Google Groups "security-onion" 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. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. These are the files that will need to be changed in order to customize nodes. Find Age Regression Discord servers and make new friends! 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. 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. These policy types can be found in /etc/nsm/rules/downloaded.rules. However, generating custom traffic to test the alert can sometimes be a challenge. On Thursday, June 15, 2017 at 5:06:51 PM UTC+5:30, Wes wrote: Is it simply not triggering, or causing an error? 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 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. Are you sure you want to create this branch? so-rule allows you to disable, enable, or modify NIDS rules. Do you see these alerts in Squert or ELSA? By default, only the analyst hostgroup is allowed access to the nginx ports. It is now read-only. Inside of /opt/so/saltstack/local/salt/strelka/rules/localrules, add your YARA rules. 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. /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 a Security Onion client, you should dedicate at least 2GB RAM, but ideally 4GB if possible. /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. Please update your bookmarks. 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. 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. 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. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. Once your rules and alerts are under control, then check to see if you have packet loss. Saltstack states are used to ensure the state of objects on a minion. However, generating custom traffic to test the alert can sometimes be a challenge.
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