If you want to apply the threshold to a single node, place the pillar in /opt/so/saltstack/local/pillar/minions/.sls. 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. To add local YARA rules, create a directory in /opt/so/saltstack/local/salt/strelka/rules, for example localrules. Full Name. Revision 39f7be52. Revision 39f7be52. However, generating custom traffic to test the alert can sometimes be a challenge. Do you see these alerts in Squert or ELSA? To configure syslog for Security Onion: Stop the Security Onion service. . For example, suppose we want to disable SID 2100498. /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. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. 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. Backing up current local_rules.xml file. You may want to bump the SID into the 90,000,000 range and set the revision to 1. 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. 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 Tried as per your syntax, but still issue persists. /opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. Security Onion has Snort built in and therefore runs in the same instance. Long-term you should only run the rules necessary for > your environment. Custom rules can be added to the local.rules file Rule threshold entries can . For example, if you dont care that users are accessing Facebook, then you can silence the policy-based signatures for Facebook access. idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. To get the best performance out of Security Onion, youll want to tune it for your environment. . MISP Rules. For more information about Salt, please see https://docs.saltstack.com/en/latest/. For example, if you had a web server you could include 80 and 443 tcp into an alias or in this case a port group. and dont forget that the end is a semicolon and not a colon. This section will cover both network firewalls outside of Security Onion and the host-based firewall built into Security Onion. 7.2. A. 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. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. To unsubscribe from this group and stop receiving emails from it, send an email to. Adding local rules in Security Onion is a rather straightforward process. In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. Give feedback. There isnt much in here other than anywhere, dockernet, localhost and self. There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). For some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. 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 Diagnostic logs can be found in /opt/so/log/salt/. In a distributed deployment, the manager node controls all other nodes via salt. 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. This is an advanced case and you most likely wont never need to modify these files. Copyright 2023 We've been teaching Security Onion classes and providing Professional Services since 2014. You can read more about this at https://redmine.openinfosecfoundation.org/issues/4377. Run rule-update (this will merge local.rules into downloaded.rules, update. However, generating custom traffic to test the alert can sometimes be a challenge. Can anyone tell me > > > > what I've done wrong please? You can add Wazuh HIDS rules in /opt/so/rules/hids/local_rules.xml. 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 in Sguil? You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. The signature id (SID) must be unique. Inside of /opt/so/saltstack/local/salt/strelka/rules/localrules, add your YARA rules. For example, suppose that we want to modify SID 2100498 and replace any instances of returned root with returned root test. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. /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. From https://docs.saltstack.com/en/latest/: Salt is a core component of Security Onion 2 as it manages all processes on all nodes. You signed in with another tab or window. If you would like to pull in NIDS rules from a MISP instance, please see: Reboot into your new Security Onion installation and login using the username/password you specified in the previous step. Download Security Onion 20110116. the rule is missing a little syntax, maybe try: alert icmp any any -> $HOME_NET any (msg:"ICMP Testing"; sid:1000001; rev:1;). The county seat is in Evansville. In 2008, Doug Burks started working on Security Onion, a Linux distribution for intrusion detection, network security monitoring, and log management. 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. 4. The server is also responsible for ruleset management. From the Command Line. 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. 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). That's what we'll discuss in this section. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. However, the exception is now logged. 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. 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. =========================================================================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=========================================================================. You could try testing a rule . 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. 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 You received this message because you are subscribed to the Google Groups "security-onion" group. We created and maintain Security Onion, so we know it better than anybody else. /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml defines custom port groups. . There are two directories that contain the yaml files for the firewall configuration. 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. Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. > To unsubscribe from this topic . A tag already exists with the provided branch name. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. For example, consider the following rules that reference the ET.MSSQL flowbit. 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. Interested in discussing how our products and services can help your organization? 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. This is located at /opt/so/saltstack/local/pillar/minions/.sls. idstools may seem like it is ignoring your disabled rules request if you try to disable a rule that has flowbits set. Security Onion is a intrusion detection and network monitoring tool. When you purchase products and services from us, you're helping to fund development of Security Onion! 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. More information on each of these topics can be found in this section. 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. Add the following to the minions sls file located at. Port groups are a way of grouping together ports similar to a firewall port/service alias. Manager of Support and Professional Services. Security Onion. . If so, then tune the number of AF-PACKET workers for sniffing processes. If it is, then the most expedient measure may be to resolve the misconfiguration and then reinvestigate tuning. 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. Files here should not be modified as changes would be lost during a code update. However, generating custom traffic to test the alert can sometimes be a challenge. alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). 2. Beta Ingest. (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. /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. ELSA? Then tune your IDS rulesets. 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. 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. epic charting system training Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you dont want your network sensors to process. 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. Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. 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. . However, generating custom traffic to test the alert can sometimes be a challenge. Started by Doug Burks, and first released in 2009, Security Onion has. Tracking. Cleaning up local_rules.xml backup files older than 30 days. 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. 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. Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. 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. You can find the latest version of this page at: https://securityonion.net/docs/AddingLocalRules. Run so-rule without any options to see the help output: We can use so-rule to modify an existing NIDS rule. 1. How are they parsed? Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. 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. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you don't want your network sensors to process. https://docs.securityonion.net/en/2.3/local-rules.html?#id1. According to NIST, which step in the digital forensics process involves drawing conclusions from data? Answered by weslambert on Dec 15, 2021. By default, only the analyst hostgroup is allowed access to the nginx ports. /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. Have you tried something like this, in case you are not getting traffic to $HOME_NET?
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