Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. How are they stored? 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. As shown above, we edit the minion pillar and add the SID to the idstools - sids - disabled section. Security Onion is an open-source and free Linux distribution for log management, enterprise security monitoring, and intrusion detection. /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. 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. FAQ Security-Onion-Solutions/security-onion Wiki GitHub That's what we'll discuss in this section. This directory contains the default firewall rules. 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 territories controlled by the ROC consist of 168 islands, with a combined area of 36,193 square . These non-manager nodes are referred to as salt minions. /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. MISP Rules. Security Onion not detecting traffic - groups.google.com Security Onion Layers Ubuntu based OS Snort, Suricata Snorby Bro Sguil Squert 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. Generate some traffic to trigger the alert. AddingLocalRules Security-Onion-Solutions/security-onion Wiki Tracking. 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. 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. 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 Run rule-update (this will merge local.rules into downloaded.rules, update. 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. 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. Custom rules can be added to the local.rules file Rule threshold entries can . After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. 41 - Network Segmentation, VLANs, and Subnets. Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. 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. 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. How are they parsed? . Give feedback. /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. When configuring network firewalls for distributed deployments, youll want to ensure that nodes can connect as shown below. See above for suppress examples. Salt Security Onion 2.3 documentation There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). lawson cedars. 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. 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. Then tune your IDS rulesets. 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. It is now read-only. (Archived 1/22) Tuning NIDS Rules in Security Onion - YouTube The signature id (SID) must be unique. 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. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. 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. OSSEC custom rules not generating alerts - Google Groups When editing these files, please be very careful to respect YAML syntax, especially whitespace. 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). 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 { 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 Run so-rule without any options to see the help output: We can use so-rule to modify an existing NIDS rule. Important "Security Onion" Files and Directories - Medium 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. 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. sigs.securityonion.net (Signature files for Security Onion containers) ghcr.io (Container downloads) rules.emergingthreatspro.com (Emerging Threats IDS rules) rules.emergingthreats.net (Emerging Threats IDS open rules) www.snort.org (Paid Snort Talos ruleset) github.com (Strelka and Sigma rules updates) /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. This way, you still have the basic ruleset, but the situations in which they fire are altered. Finally, run so-strelka-restart to allow Strelka to pull in the new rules. For example, if you include a bad custom snort rule with incorrect syntax, the snort engine will fail . The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. =========================================================================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=========================================================================. This first sub-section will discuss network firewalls outside of Security Onion. Diagnostic logs can be found in /opt/so/log/salt/. If you were to add a search node, you would see its IP appear in both the minion and the search_node host groups. When you purchase products and services from us, you're helping to fund development of Security Onion! 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. When editing these files, please be very careful to respect YAML syntax, especially whitespace. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. Revision 39f7be52. Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. Open /etc/nsm/rules/local.rules using your favorite text editor. Let's add a simple rule that will alert on the detection of a string in a tcp session. Logs . Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: 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. Salt is a core component of Security Onion 2 as it manages all processes on all nodes. You could try testing a rule . Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Managing Rules Security Onion 2.3 documentation Re: [security-onion] Snort Local rules not getting alerts in ELSA / SQUERT Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. Backing up current local_rules.xml file. Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. 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! These are the files that will need to be changed in order to customize nodes. If you need to increase this delay, it can be done using the salt:minion:service_start_delay pillar. 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). Was this translation helpful? 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. Escalate local privileges to root level. Salt sls files are in YAML format. Full Name. For example, suppose we want to disable SID 2100498. Naming convention: The collection of server processes has a server name separate from the hostname of the box. A tag already exists with the provided branch name. More information on each of these topics can be found in this section. 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). 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. Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. 7.2. Firewall Security Onion 2.3 documentation This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. It incorporates NetworkMiner, CyberChef, Squert, Sguil, Wazuh, Bro, Suricata, Snort, Kibana, Logstash, Elasticsearch, and numerous other security onion tools. 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. This error now occurs in the log due to a change in the exception handling within Salts event module. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. Open /etc/nsm/rules/local.rules using your favorite text editor. Have you tried something like this, in case you are not getting traffic to $HOME_NET? 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. Our products include both the Security Onion software and specialized hardware appliances that are built and tested to run Security Onion. 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 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. Inside of /opt/so/saltstack/local/salt/strelka/rules/localrules, add your YARA rules. 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. 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 . You need to configure Security Onion to send syslog so that InsightIDR can ingest it. 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. 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. and dont forget that the end is a semicolon and not a colon. Cannot retrieve contributors at this time. Files here should not be modified as changes would be lost during a code update. Saltstack states are used to ensure the state of objects on a minion. 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 may want to bump the SID into the 90,000,000 range and set the revision to 1. Our documentation has moved to https://securityonion.net/docs/. Revision 39f7be52. 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. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you dont want your network sensors to process. Modifying these values outside of so-allow or so-firewall could lead to problems accessing your existing hosts. 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. In syslog-ng, the following configuration forwards all local logs to Security Onion. A Campus Card is your University of Reading student/staff/associate There isnt much in here other than anywhere, dockernet, localhost and self. 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. Adding local rules in Security Onion is a rather straightforward process. Started by Doug Burks, and first released in 2009, Security Onion has. If this is a distributed deployment, edit local.rules on your master server and it will replicate to your sensors. 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. Security Onion: June 2013 You should only run the rules necessary for your environment, so you may want to disable entire categories of rules that dont apply to you. However, generating custom traffic to test the alert can sometimes be a challenge. You signed in with another tab or window. 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. Try checking /var/log/nsm/hostname-interface/snortu-1.log for clues and please post the exact rule syntax you are attempting to use. Please review the Salt section to understand pillars and templates. 7.2. Adding Your Own Rules Suricata 6.0.0 documentation - Read the Docs 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. 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. When I run sostat. Security Onion: An Interesting Guide For 2021 - Jigsaw Academy Port groups are a way of grouping together ports similar to a firewall port/service alias. Manager of Support and Professional Services. Set anywhere from 5 to 12 in the local_rules Kevin. 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. Home About Us Bill Pay 877-213-8180 Product Library My accountItems of interest (0) Get your campus card Your campus card allows you to borrow books from the Library, use services at the student centre, make payments at Macquarie University retail outlets, and identify yourself during class tests and .