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To add local YARA rules, create a directory in /opt/so/saltstack/local/salt/strelka/rules, for example localrules. Generate some traffic to trigger the alert. You do not have permission to delete messages in this group, Either email addresses are anonymous for this group or you need the view member email addresses permission to view the original message. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. When you purchase products and services from us, you're helping to fund development of Security Onion! Custom rules can be added to the local.rules file Rule threshold entries can . Boot the ISO and run through the installer. Copyright 2023 For more information, please see https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. https://securityonion.net/docs/AddingLocalRules. Copyright 2023 /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. Any line beginning with "#" can be ignored as it is a comment. 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). Try checking /var/log/nsm/hostname-interface/snortu-1.log for clues and please post the exact rule syntax you are attempting to use. 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. PFA local.rules. Write your rule, see Rules Format and save it. 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. After viewing your redacted sostat it seems that the ICMP and UDP rules are triggering: Are you using SO with in a VM? /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. Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: Paste the rule. To configure syslog for Security Onion: Stop the Security Onion service. Revision 39f7be52. Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. 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. 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. If you built the rule correctly, then snort should be back up and running. Security Onion a free and open platform for intrusion detection, enterprise security monitoring, and log management. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. 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 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 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. If you want to apply the threshold to a single node, place the pillar in /opt/so/saltstack/local/pillar/minions/.sls. There are many ways to achieve age regression, but the three primary methods are: Botox. Then tune your IDS rulesets. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. Add the following to the minions sls file located at. /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. According to NIST, which step in the digital forensics process involves drawing conclusions from data? Let's add a simple rule that will alert on the detection of a string in a tcp session. Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. You can find the latest version of this page at: https://securityonion.net/docs/AddingLocalRules. 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. idstools may seem like it is ignoring your disabled rules request if you try to disable a rule that has flowbits set. However, the exception is now logged. 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. For example: By default, if you use so-allow to add a host to the syslog hostgroup, that host will only be allowed to connect to the manager node. 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. The server is also responsible for ruleset management. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. 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. 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. > To unsubscribe from this topic . In many of the use cases below, we are providing the ability to modify a configuration file by editing either the global or minion pillar file. 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. Our documentation has moved to https://securityonion.net/docs/. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you dont want your network sensors to process. You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. 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 Salt is a new approach to infrastructure management built on a dynamic communication bus. Backups; Docker; DNS Anomaly Detection; Endgame; ICMP Anomaly Detection; Jupyter Notebook; Machine Learning; Adding a new disk; PCAPs for Testing; Removing a Node; Syslog Output; UTC and Time Zones; Utilities. A. Please keep this value below 90 seconds otherwise systemd will reach timeout and terminate the service. But after I run the rule-update command, no alert is generated in Sguil based on that rule.It was working when I first installed Security Onion. 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. 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. If it is, then the most expedient measure may be to resolve the misconfiguration and then reinvestigate tuning. Our products include both the Security Onion software and specialized hardware appliances that are built and tested to run Security Onion. . "; 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). For more information about Salt, please see https://docs.saltstack.com/en/latest/. Please update your bookmarks. Default YARA rules are provided from Florian Roths signature-base Github repo at https://github.com/Neo23x0/signature-base. 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. Please note! And when I check, there are no rules there. This way, you still have the basic ruleset, but the situations in which they fire are altered. Generate some traffic to trigger the alert. For example, suppose that we want to modify SID 2100498 and replace any instances of returned root with returned root test. You may want to bump the SID into the 90,000,000 range and set the revision to 1. You need to configure Security Onion to send syslog so that InsightIDR can ingest it. Durio zibethinus, native to Borneo and Sumatra, is the only species available in the international market.It has over 300 named varieties in Thailand and 100 in Malaysia, as of 1987. Adding local rules in Security Onion is a rather straightforward process. Revision 39f7be52. Enter the following sample in a line at a time. 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 As shown above, we edit the minion pillar and add the SID to the idstools - sids - disabled section. 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. However, generating custom traffic to test the alert can sometimes be a challenge. This can be done in the minion pillar file if you want the delay for just that minion, or it can be done in the global.sls file if it should be applied to all minions. Ingest. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. Give feedback. Was this translation helpful? If you would like to pull in NIDS rules from a MISP instance, please see the MISP Rules section. How are they parsed? 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. 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 { Before You Begin. . (Alternatively, you can press Ctrl+Alt+T to open a new shell.) 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. /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. Previously, in the case of an exception, the code would just pass. There are two directories that contain the yaml files for the firewall configuration. 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. 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 . It is located at /opt/so/saltstack/local/pillar/global.sls. This is located at /opt/so/saltstack/local/pillar/minions/.sls. Are you sure you want to create this branch? 41 - Network Segmentation, VLANs, and Subnets. Full Name. Run so-rule without any options to see the help output: We can use so-rule to modify an existing NIDS rule. Security Deposit Reliable Up to $5,000 Payments Higher rents as supported by comparable rents Higher Voucher Payment Standards (VPS) 10/1/2021 Signing Bonus 1 - Bedroom = $893 to $1,064 2 - Bedroom = $1,017 to $1,216 3 - Bedroom = $1,283 to $1,530 4 - Bedroom = $1,568 to $1,872 5 - Bedroom = $1,804 to $2,153 6 - Bedroom = $2,038 to . From https://docs.saltstack.com/en/latest/: Salt is a core component of Security Onion 2 as it manages all processes on all nodes. Tracking. idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. 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). 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. /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. The county seat is in Evansville. With this functionality we can suppress rules based on their signature, the source or destination address and even the IP or full CIDR network block. 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 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. 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. 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 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. There isnt much in here other than anywhere, dockernet, localhost and self. In 2008, Doug Burks started working on Security Onion, a Linux distribution for intrusion detection, network security monitoring, and log management. Default pillar file: This is the pillar file located under /opt/so/saltstack/default/pillar/. Saltstack states are used to ensure the state of objects on a minion. 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. Interested in discussing how our products and services can help your organization? For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. If . 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. Once logs are generated by network sniffing processes or endpoints, where do they go? To unsubscribe from this group and stop receiving emails from it, send an email to. 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 may want to bump the SID into the 90,000,000 range and set the revision to 1. > > > > > > > > Cheers, Andi > > > > > > > > > > -- Mit besten Gren Shane Castle > > > > -- > Mit besten Gren > Shane Castle > > -- > You received this message because you are subscribed to a topic in the > Google Groups "security-onion" group. Any definitions made here will override anything defined in other pillar files, including global. 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. 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. Adding Your Own Rules . These non-manager nodes are referred to as salt minions. In this file, the idstools section has a modify sub-section where you can add your modifications. Security Onion is a free and open source platform for threat hunting, network security monitoring, and log management. That's what we'll discuss in this section. Modifying these values outside of so-allow or so-firewall could lead to problems accessing your existing hosts. In syslog-ng, the following configuration forwards all local logs to Security Onion. For example, if you include a bad custom snort rule with incorrect syntax, the snort engine will fail . A tag already exists with the provided branch name. 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. In order to apply the threshold to all nodes, place the pillar in /opt/so/saltstack/local/pillar/global.sls. Security. Youll need to ensure the first of the two properly escapes any characters that would be interpreted by regex. Here are some of the items that can be customized with pillar settings: Currently, the salt-minion service startup is delayed by 30 seconds. From the Command Line. Also ensure you run rule-update on the machine. All the following will need to be run from the manager. =========================================================================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=========================================================================. See above for suppress examples. We created and maintain Security Onion, so we know it better than anybody else. There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). When editing these files, please be very careful to respect YAML syntax, especially whitespace. For example, suppose we want to disable SID 2100498. Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. You could try testing a rule . 2. Security Onion has Snort built in and therefore runs in the same instance. Global pillar file: This is the pillar file that can be used to make global pillar assignments to the nodes. 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, Check your syslog-ng configuration for the name of the local log source ("src" is used on SUSE systems). Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. 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. 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. 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. If you want to tune Wazuh HIDS alerts, please see the Wazuh section. 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). It incorporates NetworkMiner, CyberChef, Squert, Sguil, Wazuh, Bro, Suricata, Snort, Kibana, Logstash, Elasticsearch, and numerous other security onion tools. so-rule allows you to disable, enable, or modify NIDS rules. 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 would like to create a rule yourself and use it with Suricata, this guide might be helpful. 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. /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. MISP Rules. When you run so-allow or so-firewall, it modifies this file to include the IP provided in the proper hostgroup. 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. (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. Backing up current local_rules.xml file. Started by Doug Burks, and first released in 2009, Security Onion has. You received this message because you are subscribed to the Google Groups "security-onion" group. Set anywhere from 5 to 12 in the local_rules Kevin. You can read more about this at https://redmine.openinfosecfoundation.org/issues/4377. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. in Sguil? 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. to security-onion When I run 'rule-update' it give an error that there are no rules in /usr/local/lib/snort_dynamicrules. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you don't want your network sensors to process. 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,. The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. 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. 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. 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. I went ahead and put in the below rules under /etc/nsm/local.rules and ran the rule-update command. Copyright 2023 Adding local rules in Security Onion is a rather straightforward process. Can anyone tell me > > > > what I've done wrong please? 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. This is an advanced case and you most likely wont never need to modify these files. The firewall state is designed with the idea of creating port groups and host groups, each with their own alias or name, and associating the two in order to create an allow rule. Copyright 2023 Do you see these alerts in Squert or ELSA? 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! 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. Cleaning up local_rules.xml backup files older than 30 days. The territories controlled by the ROC consist of 168 islands, with a combined area of 36,193 square . . https://docs.securityonion.net/en/2.3/local-rules.html?#id1. It . However, generating custom traffic to test the alert can sometimes be a challenge. 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). Revision 39f7be52. Minion pillar file: This is the minion specific pillar file that contains pillar definitions for that node. 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).