Backing up current local_rules.xml file. When editing these files, please be very careful to respect YAML syntax, especially whitespace. Generate some traffic to trigger the alert. 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. /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml defines custom port groups. Revision 39f7be52. 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, /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. 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. 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. Salt sls files are in YAML format. 4. The easiest way to test that our NIDS is working as expected might be to simply access http://testmynids.org/uid/index.html from a machine that is being monitored by Security Onion. 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. =========================================================================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 can see that we have an alert with the IP addresses we specified and the TCP ports we specified. I went ahead and put in the below rules under /etc/nsm/local.rules and ran the rule-update command. Where is it that you cannot view them? 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. For example, if you dont care that users are accessing Facebook, then you can silence the policy-based signatures for Facebook access. 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. You are an adult, at least 18 years of age, you are familiar with and understand the standards and laws of your local community regarding sexually-oriented media. This way, you still have the basic ruleset, but the situations in which they fire are altered. 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). Copyright 2023 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. 1. Default pillar file: This is the pillar file located under /opt/so/saltstack/default/pillar/. You signed in with another tab or window. PFA local.rules. 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. 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? If you dont want to wait for these automatic processes, you can run them manually from the manager (replacing $SENSORNAME_$ROLE as necessary): Lets add a simple rule to /opt/so/saltstack/local/salt/idstools/local.rules thats really just a copy of the traditional id check returned root rule: Restart Suricata (replacing $SENSORNAME_$ROLE as necessary): If you built the rule correctly, then Suricata should be back up and running. 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 { To verify the Snort version, type in snort -Vand hit Enter. Security Onion is an open-source and free Linux distribution for log management, enterprise security monitoring, and intrusion detection. Cannot retrieve contributors at this time. Custom rules can be added to the local.rules file Rule threshold entries can . Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you dont want your network sensors to process. Security Onion a free and open platform for intrusion detection, enterprise security monitoring, and log management. /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. ELSA? For example, consider the following rules that reference the ET.MSSQL flowbit. Then tune your IDS rulesets. As you can see I have the Security Onion machine connected within the internal network to a hub. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. 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. Cleaning up local_rules.xml backup files older than 30 days. 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. Salt can be used for data-driven orchestration, remote execution for any infrastructure, configuration management for any app stack, and much more. It . Diagnostic logs can be found in /opt/so/log/salt/. This repository has been archived by the owner on Apr 16, 2021. Set anywhere from 5 to 12 in the local_rules Kevin. 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,. 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. This directory stores the firewall rules specific to your grid. Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. Open /etc/nsm/rules/local.rules using your favorite text editor. 7.2. 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. In this file, the idstools section has a modify sub-section where you can add your modifications. Some of these refer to areas where data is stored, while others point to configuration files that can be modified to change how Security Onion interacts with various tools. Port groups are a way of grouping together ports similar to a firewall port/service alias. If this is a distributed deployment, edit local.rules on your master server and it will replicate to your sensors. 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. Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. See above for suppress examples. in Sguil? Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. Logs. These are the files that will need to be changed in order to customize nodes. Please note! Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Beta 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. Security Onion uses idstools to download new signatures every night and process them against a set list of user generated configurations. However, generating custom traffic to test the alert can sometimes be a challenge. After select all interfaces also ICMP logs not showing in sguil. The error can be ignored as it is not an indication of any issue with the minions. Data collection Examination 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. 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. 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! However, generating custom traffic to test the alert can sometimes be a challenge. Ingest. 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. Security Onion. 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. 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. We've been teaching Security Onion classes and providing Professional Services since 2014. (Alternatively, you can press Ctrl+Alt+T to open a new shell.) All alerts are viewable in Alerts, Dashboards, Hunt, and Kibana. 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. Escalate local privileges to root level. It's simple enough to run in small environments without many issues and allows advanced users to deploy distributed systems that can be used in network enterprise type environments. 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. Boot the ISO and run through the installer. 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. 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 error now occurs in the log due to a change in the exception handling within Salts event module. In a distributed deployment, the manager node controls all other nodes via salt. The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. idstools may seem like it is ignoring your disabled rules request if you try to disable a rule that has flowbits set. 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. Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. Manager of Support and Professional Services. The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. Please review the Salt section to understand pillars and templates. Check out our NIDS tuning video at https://youtu.be/1jEkFIEUCuI! We offer both training and support for Security Onion. Copyright 2023 Please provide the output of sostat-redacted, attaching as a plain text file, or by using a service like Pastebin.com. lawson cedars. This writeup contains a listing of important Security Onion files and directories. 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. 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. And when I check, there are no rules there. Add the following to the sensor minion pillar file located at. In syslog-ng, the following configuration forwards all local logs to Security Onion. Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: You could try testing a rule . 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). If you would like to pull in NIDS rules from a MISP instance, please see the MISP Rules section. Adding local rules in Security Onion is a rather straightforward process. /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. If you were to add a search node, you would see its IP appear in both the minion and the search_node host groups. 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. By default, only the analyst hostgroup is allowed access to the nginx ports. You need to configure Security Onion to send syslog so that InsightIDR can ingest it. 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 Security Onion offers the following choices for rulesets to be used by Snort/Suricata: 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 Tried as per your syntax, but still issue persists. How are they stored? Give feedback. For some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. 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. All node types are added to the minion host group to allow Salt communication. Salt is a core component of Security Onion 2 as it manages all processes on all nodes. 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. /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. Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. Add the following to the minions sls file located at. 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. Revision 39f7be52. Minion pillar file: This is the minion specific pillar file that contains pillar definitions for that node. Are you sure you want to create this branch? 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. 41 - Network Segmentation, VLANs, and Subnets. Security Onion generates a lot of valuable information for you the second you plug it into a TAP or SPAN port. If you would like to pull in NIDS rules from a MISP instance, please see: (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. alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). The county seat is in Evansville. Assuming you have Internet access, Security Onion will automatically update your NIDS rules on a daily basis. To unsubscribe from this group and stop receiving emails from it, send an email to. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. 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. You can learn more about scapy at secdev.org and itgeekchronicles.co.uk. 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. Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. These policy types can be found in /etc/nsm/rules/downloaded.rules. When you run so-allow or so-firewall, it modifies this file to include the IP provided in the proper hostgroup. Adding Local Rules Security Onion 2.3 documentation Docs Tuning Adding Local Rules Edit on GitHub Adding Local Rules NIDS You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. However, generating custom traffic to test the alert can sometimes be a challenge. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. Any definitions made here will override anything defined in other pillar files, including global. Finally, run so-strelka-restart to allow Strelka to pull in the new rules. Write your rule, see Rules Format and save it. 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 Copyright 2023 /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. 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. When I run sostat. Any line beginning with "#" can be ignored as it is a comment. If you need to increase this delay, it can be done using the salt:minion:service_start_delay pillar. 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. Also ensure you run rule-update on the machine. 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. 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. 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). Local pillar file: This is the pillar file under /opt/so/saltstack/local/pillar/. Backing up current downloaded.rules file before it gets overwritten. to security-onion When I run 'rule-update' it give an error that there are no rules in /usr/local/lib/snort_dynamicrules. Try checking /var/log/nsm/hostname-interface/snortu-1.log for clues and please post the exact rule syntax you are attempting to use. Some node types get their IP assigned to multiple host groups. Revision 39f7be52. A. For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. Was this translation helpful? If you right click on the, You can learn more about snort and writing snort signatures from the. Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). 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. 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. 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. However, the exception is now logged. Revision 39f7be52. > To unsubscribe from this topic . so-rule allows you to disable, enable, or modify NIDS rules. Copyright 2023 If you need to manually update your rules, you can run the following on your manager node: If you have a distributed deployment and you update the rules on your manager node, then those rules will automatically replicate from the manager node to your sensors within 15 minutes. 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 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. If you built the rule correctly, then snort should be back up and running. Files here should not be modified as changes would be lost during a code update. 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. "; 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). If you are on a large network, you may need to do additional tuning like pinning processes to CPU cores. Next, run so-yara-update to pull down the rules. If . IPS Policy I have 3 simple use cases (1) Detect FTP Connection to our public server 129.x.x.x (2) Detect SSH Connection attempts (3) Detect NMAP scan. These non-manager nodes are referred to as salt minions. A tag already exists with the provided branch name. Security. 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, please see https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. . There are many ways to achieve age regression, but the three primary methods are: Botox. Disabling all three of those rules by adding the following to disablesid.conf has the obvious negative effect of disabling all three of the rules: When you run sudo so-rule-update, watch the Setting Flowbit State section and you can see that if you disable all three (or however many rules share that flowbit) that the Enabled XX flowbits line is decremented and all three rules should then be disabled in your all.rules. 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. Adding local rules in Security Onion is a rather straightforward process.