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. This will add the host group to, Add the desired IPs to the host group. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. As you can see I have the Security Onion machine connected within the internal network to a hub. Was this translation helpful? Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. If you are on a large network, you may need to do additional tuning like pinning processes to CPU cores. . You may want to bump the SID into the 90,000,000 range and set the revision to 1. There are many ways to achieve age regression, but the three primary methods are: Botox. We offer both training and support for Security Onion. Find Age Regression Discord servers and make new friends! 5. Assuming you have Internet access, Security Onion will automatically update your NIDS rules on a daily basis. 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. If you were to add a search node, you would see its IP appear in both the minion and the search_node host groups. /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. 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. 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. 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. 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 /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 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 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. First off, I'll briefly explain security onion security Onion is the leading open source operating system for network security monitoring, intrusion detection, log management and threat hunting. 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. You can read more about this at https://redmine.openinfosecfoundation.org/issues/4377. idstools may seem like it is ignoring your disabled rules request if you try to disable a rule that has flowbits set. 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. Diagnostic logs can be found in /opt/so/log/salt/. Finally, run so-strelka-restart to allow Strelka to pull in the new rules. 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. In order to apply the threshold to all nodes, place the pillar in /opt/so/saltstack/local/pillar/global.sls. All alerts are viewable in Alerts, Dashboards, Hunt, and Kibana. 7.2. For a Security Onion client, you should dedicate at least 2GB RAM, but ideally 4GB if possible. Naming convention: The collection of server processes has a server name separate from the hostname of the box. See above for suppress examples. c96 extractor. There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). Salt is a new approach to infrastructure management built on a dynamic communication bus. 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: Craft the layer 2 information. we run SO in a distributed deployment and the manager doesn't run strelka but does run on the sensor, the paths however (/opt/so/saltstack/local/salt/strelka/rules) exist on the manger but not the sensor, I did find the default repo under opt/so/saltstack/default/salt/strelka/rules/ on the manager and I can run so-yara-update but not so-strelka-restart because its not running on the manager so I'm a little confused on where I should be putting the custom YARA rules because things don't line up with the documentation or I'm just getting super confused. If we want to allow a host or group of hosts to send syslog to a sensor, then we can do the following: In this example, we will be extending the default nginx port group to include port 8086 for a standalone node. 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 Please keep this value below 90 seconds otherwise systemd will reach timeout and terminate the service. The server is also responsible for ruleset management. After viewing your redacted sostat it seems that the ICMP and UDP rules are triggering: Are you using SO with in a VM? In syslog-ng, the following configuration forwards all local logs to Security Onion. 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. Security Onion a free and open platform for intrusion detection, enterprise security monitoring, and log management. And when I check, there are no rules there. This first sub-section will discuss network firewalls outside of Security Onion. Tracking. Nodes will be configured to pull from repocache.securityonion.net but this URL does not actually exist on the Internet, it is just a special address for the manager proxy. Add the following to the sensor minion pillar file located at. The territories controlled by the ROC consist of 168 islands, with a combined area of 36,193 square . 3. Saltstack states are used to ensure the state of objects on a minion. This section will cover both network firewalls outside of Security Onion and the host-based firewall built into Security Onion. Full Name. For more information, please see https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. Manager of Support and Professional Services. In 2008, Doug Burks started working on Security Onion, a Linux distribution for intrusion detection, network security monitoring, and log management. 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. If you pivot from that alert to the corresponding pcap you can verify the payload we sent. Please update your bookmarks. Revision 39f7be52. Security. 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. You may want to bump the SID into the 90,000,000 range and set the revision to 1. 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 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). 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. Try checking /var/log/nsm/hostname-interface/snortu-1.log for clues and please post the exact rule syntax you are attempting to use. 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. . /opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. 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. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. Default YARA rules are provided from Florian Roths signature-base Github repo at https://github.com/Neo23x0/signature-base. Then tune your IDS rulesets. > To unsubscribe from this topic . How are they stored? This writeup contains a listing of important Security Onion files and directories. You signed in with another tab or window. Our products include both the Security Onion software and specialized hardware appliances that are built and tested to run Security Onion. Youll need to ensure the first of the two properly escapes any characters that would be interpreted by regex. This is an advanced case and you most likely wont never need to modify these files. 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. 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. Security Onion uses idstools to download new signatures every night and process them against a set list of user generated configurations. When you run so-allow or so-firewall, it modifies this file to include the IP provided in the proper hostgroup. 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. Then tune your IDS rulesets. If so, then tune the number of AF-PACKET workers for sniffing processes. 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. Here are some of the items that can be customized with pillar settings: Currently, the salt-minion service startup is delayed by 30 seconds. Once logs are generated by network sniffing processes or endpoints, where do they go? You signed in with another tab or window. The error can be ignored as it is not an indication of any issue with the minions. 41 - Network Segmentation, VLANs, and Subnets. Security Onion offers the following choices for rulesets to be used by Suricata. Started by Doug Burks, and first released in 2009, Security Onion has. 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). Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. Salt can be used for data-driven orchestration, remote execution for any infrastructure, configuration management for any app stack, and much more. 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. Check your syslog-ng configuration for the name of the local log source ("src" is used on SUSE systems). MISP Rules. By default, only the analyst hostgroup is allowed access to the nginx ports. This directory stores the firewall rules specific to your grid. If you want to apply the threshold to a single node, place the pillar in /opt/so/saltstack/local/pillar/minions/.sls. A. 1. Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. You can find the latest version of this page at: https://securityonion.net/docs/AddingLocalRules. For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. You need to configure Security Onion to send syslog so that InsightIDR can ingest it. 1. 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 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. Also ensure you run rule-update on the machine. This wiki is no longer maintained. 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. You signed in with another tab or window. Are you sure you want to create this branch? Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. ELSA? /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. 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. Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. Custom rules can be added to the local.rules file Rule threshold entries can . When editing these files, please be very careful to respect YAML syntax, especially whitespace. 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. After select all interfaces also ICMP logs not showing in sguil. Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. For example, if you include a bad custom snort rule with incorrect syntax, the snort engine will fail . If you try to disable the first two rules without disabling the third rule (which has flowbits:isset,ET.MSSQL) the third rule could never fire due to one of the first two rules needing to fire first. For example, suppose that we want to modify SID 2100498 and replace any instances of returned root with returned root test. /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml defines custom port groups. Reboot into your new Security Onion installation and login using the username/password you specified in the previous step. Next, run so-yara-update to pull down the rules. That's what we'll discuss in this section. If you right click on the, You can learn more about snort and writing snort signatures from the. Run so-rule without any options to see the help output: We can use so-rule to modify an existing NIDS rule. Please provide the output of sostat-redacted, attaching as a plain text file, or by using a service like Pastebin.com. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. However, generating custom traffic to test the alert can sometimes be a challenge. If it is, then the most expedient measure may be to resolve the misconfiguration and then reinvestigate tuning. If you built the rule correctly, then snort should be back up and running. lawson cedars. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. 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. Adding Your Own Rules . The county seat is in Evansville. Open /etc/nsm/rules/local.rules using your favorite text editor. /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. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. PFA local.rules. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. 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. 2. There are two directories that contain the yaml files for the firewall configuration. epic charting system training Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. These policy types can be found in /etc/nsm/rules/downloaded.rules. Check out our NIDS tuning video at https://youtu.be/1jEkFIEUCuI! All node types are added to the minion host group to allow Salt communication. Revision 39f7be52. Security Onion Layers Ubuntu based OS Snort, Suricata Snorby Bro Sguil Squert A tag already exists with the provided branch name. This way, you still have the basic ruleset, but the situations in which they fire are altered. Can anyone tell me > > > > what I've done wrong please? 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. While Vanderburgh County was the seventh-largest county in 2010 population with 179,703 people, it is also the eighth-smallest county in area in Indiana and the smallest in southwestern Indiana, covering only 236 square miles (610 km2). 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 error now occurs in the log due to a change in the exception handling within Salts event module. 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. 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. Adding local rules in Security Onion is a rather straightforward process. When configuring network firewalls for distributed deployments, youll want to ensure that nodes can connect as shown below. All the following will need to be run from the manager. 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 . Use one of the following examples in your console/terminal window: sudo nano local.rules sudo vim local.rules. Do you see these alerts in Squert or ELSA? Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: Paste the rule. Files here should not be modified as changes would be lost during a code update. Copyright 2023 If you would like to pull in NIDS rules from a MISP instance, please see the MISP Rules section. Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. 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? 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. Enter the following sample in a line at a time. Boot the ISO and run through the installer. 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). 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. 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. Our documentation has moved to https://securityonion.net/docs/. 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). If you would like to create a rule yourself and use it with Suricata, this guide might be helpful. If this is a distributed deployment, edit local.rules on your master server and it will replicate to your sensors. 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. 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. 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. Once your rules and alerts are under control, then check to see if you have packet loss. 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,. Let's add a simple rule that will alert on the detection of a string in a tcp session. Salt is a core component of Security Onion 2 as it manages all processes on all nodes. 137 vi local.rules 138 sudo vi local.rules 139 vi cd .. 140 cd .. 141 vi securityonion.conf 142 sudo vi pulledpork/pulledpork.conf 143 sudo rule-update 144 history 145 vi rules/downloaded.rules 146 sudo vi local.rules 147 sudo vi rules/local.rules 160 sudo passwd david 161 sudo visudo 162 sudo vi rules/local.rules 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. 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 is located at /opt/so/saltstack/local/pillar/minions/.sls. If . For example, if you dont care that users are accessing Facebook, then you can silence the policy-based signatures for Facebook access. Minion pillar file: This is the minion specific pillar file that contains pillar definitions for that node.
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