To add local YARA rules, create a directory in /opt/so/saltstack/local/salt/strelka/rules, for example localrules. Then tune your IDS rulesets. Adding local rules in Security Onion is a rather straightforward process. Adding Local Rules Security Onion 2.3 documentation Finally, run so-strelka-restart to allow Strelka to pull in the new rules. Copyright 2023 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? /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. I've just updated the documentation to be clearer. You signed in with another tab or window. 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 For example, if you include a bad custom snort rule with incorrect syntax, the snort engine will fail . 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. The error can be ignored as it is not an indication of any issue with the minions. Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. Long-term you should only run the rules necessary for > your environment. The rule categories are Malware-Cnc, Blacklist, SQL injection, Exploit-kit, and rules from the connectivity ruleset Security: CVSS Score of 8 or higher Vulnerability age is four years old and newer The rule categories include Balanced and Connectivity with one additional category being App-detect Identification. Security. Global pillar file: This is the pillar file that can be used to make global pillar assignments to the nodes. The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. 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. (Archived 1/22) Tuning NIDS Rules in Security Onion - YouTube To verify the Snort version, type in snort -Vand hit Enter. idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. At those times, it can be useful to query the database from the commandline. 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. . We've been teaching Security Onion classes and providing Professional Services since 2014. In a distributed deployment, the manager node controls all other nodes via salt. Durian - Wikipedia The county seat is in Evansville. This wiki is no longer maintained. One thing you can do with it (and the one that most people are interested in) is to configure it for IDS mode. However, generating custom traffic to test the alert can sometimes be a challenge. 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). Local YARA rules Discussion #6556 Security-Onion - GitHub If this is a distributed deployment, edit local.rules on your master server and it will replicate to your sensors. . 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. 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. In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. Adding local rules in Security Onion is a rather straightforward process. More information on each of these topics can be found in this section. Please note! 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. 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. This section will cover both network firewalls outside of Security Onion and the host-based firewall built into Security Onion. There are two directories that contain the yaml files for the firewall configuration. 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). 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-onio.@googlegroups.com. Next, run so-yara-update to pull down the rules. 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. 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 Onion Solutions Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. 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. 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? Adding local rules in Security Onion is a rather straightforward process. 1. Security Onion offers the following choices for rulesets to be used by Suricata. Manager of Support and Professional Services. From https://docs.saltstack.com/en/latest/: Salt is a core component of Security Onion 2 as it manages all processes on all nodes. /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml defines custom port groups. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. Syslog-ng and Security Onion 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. Important "Security Onion" Files and Directories - Medium 4. 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. Salt minions must be able to connect to the manager node on ports, /opt/so/saltstack/local/pillar/global.sls, /opt/so/saltstack/local/pillar/minions/.sls, https://docs.saltproject.io/en/getstarted/system/communication.html, https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. For more information about Salt, please see https://docs.saltstack.com/en/latest/. If you right click on the, You can learn more about snort and writing snort signatures from the. All node types are added to the minion host group to allow Salt communication. 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. It incorporates NetworkMiner, CyberChef, Squert, Sguil, Wazuh, Bro, Suricata, Snort, Kibana, Logstash, Elasticsearch, and numerous other security onion tools. Security Onion. Write your rule, see Rules Format and save it. and dont forget that the end is a semicolon and not a colon. Enter the following sample in a line at a time. Previously, in the case of an exception, the code would just pass.
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