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For example, if you dont care that users are accessing Facebook, then you can silence the policy-based signatures for Facebook access. Adding local rules in Security Onion is a rather straightforward process. 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. 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. 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. You signed in with another tab or window. 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. 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 In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. When configuring network firewalls for distributed deployments, youll want to ensure that nodes can connect as shown below. 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. to security-onion When I run 'rule-update' it give an error that there are no rules in /usr/local/lib/snort_dynamicrules. 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? 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. All alerts are viewable in Alerts, Dashboards, Hunt, and Kibana. This writeup contains a listing of important Security Onion files and directories. https://securityonion.net/docs/AddingLocalRules. 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. Security Onion has Snort built in and therefore runs in the same instance. As you can see I have the Security Onion machine connected within the internal network to a hub. Interested in discussing how our products and services can help your organization? /opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. Long-term you should only run the rules necessary for > your environment. To verify the Snort version, type in snort -Vand hit Enter. 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. Salt is a new approach to infrastructure management built on a dynamic communication bus. Adding local rules in Security Onion is a rather straightforward process. Backing up current downloaded.rules file before it gets overwritten. However, the exception is now logged. 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. This way, you still have the basic ruleset, but the situations in which they fire are altered. Files here should not be modified as changes would be lost during a code update. 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. Run rule-update (this will merge local.rules into downloaded.rules, update. Any line beginning with "#" can be ignored as it is a comment. This error now occurs in the log due to a change in the exception handling within Salts event module. 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. Adding Your Own Rules . https://docs.securityonion.net/en/2.3/local-rules.html?#id1. Can anyone tell me > > > > what I've done wrong please? Start creating a file for your rule. This wiki is no longer maintained. Boot the ISO and run through the installer. 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. You may want to bump the SID into the 90,000,000 range and set the revision to 1. Logs. 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. Ingest. 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 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. lawson cedars. Add the following to the sensor minion pillar file located at. The remainder of this section will cover the host firewall built into Security Onion. c96 extractor. 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). Then tune your IDS rulesets. 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. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. 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. idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. 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. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. Find Age Regression Discord servers and make new friends! 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. For more information, please see https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. And when I check, there are no rules there. Copyright 2023 Identification. Salt can be used for data-driven orchestration, remote execution for any infrastructure, configuration management for any app stack, and much more. 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. 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). in Sguil? In the image below, we can see how we define some rules for an eval node. 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, In order to apply the threshold to all nodes, place the pillar in /opt/so/saltstack/local/pillar/global.sls. In a distributed deployment, the manager node controls all other nodes via salt. For some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. Check your syslog-ng configuration for the name of the local log source ("src" is used on SUSE systems). Next, run so-yara-update to pull down the rules. If you pivot from that alert to the corresponding pcap you can verify the payload we sent. /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. 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. Manager of Support and Professional Services. All the following will need to be run from the manager. Please keep this value below 90 seconds otherwise systemd will reach timeout and terminate the service. Been looking to add some custom YARA rules and have been following the docs https://docs.securityonion.net/en/2.3/local-rules.html?#id1 however I'm a little confused. 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. Fresh install of Security Onion 16.04.6.3 ISO to hardware: Two NICs, one facing management network, one monitoring mirrored port for test network Setup for Production Mode, pretty much all defaults, suricata create alert rules for /etc/nsm/local.rules and run rule-update Log into scapy/msf on kalibox, send a few suspicious packets Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Then tune your IDS rulesets. This repository has been archived by the owner on Apr 16, 2021. If you right click on the, You can learn more about snort and writing snort signatures from the. There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). One thing you can do with it (and the one that most people are interested in) is to configure it for IDS mode. However, generating custom traffic to test the alert can sometimes be a challenge. Default pillar file: This is the pillar file located under /opt/so/saltstack/default/pillar/. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. 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 { Default YARA rules are provided from Florian Roths signature-base Github repo at https://github.com/Neo23x0/signature-base. Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. Have you tried something like this, in case you are not getting traffic to $HOME_NET? 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. When I run sostat. Youll need to ensure the first of the two properly escapes any characters that would be interpreted by regex. 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. Add the following to the minions sls file located at. Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. The signature id (SID) must be unique. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. You can learn more about scapy at secdev.org and itgeekchronicles.co.uk. 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. Also ensure you run rule-update on the machine. 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. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. 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. 5. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. 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. 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. 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. Saltstack states are used to ensure the state of objects on a minion. We can start by listing any currently disabled rules: Once that completes, we can then verify that 2100498 is now disabled with so-rule disabled list: Finally, we can check that 2100498 is commented out in /opt/so/rules/nids/all.rules: If you cant run so-rule, then you can modify configuration manually. The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. Adding local rules in Security Onion is a rather straightforward process. 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. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you dont want your network sensors to process. 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. 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 . 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. (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. 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. =========================================================================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=========================================================================. Cleaning up local_rules.xml backup files older than 30 days. In this file, the idstools section has a modify sub-section where you can add your modifications. Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. Copyright 2023 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. > > => I do not know how to do your guilde line. 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. Tracking. Diagnostic logs can be found in /opt/so/log/salt/. IPS Policy The error can be ignored as it is not an indication of any issue with the minions. This section will cover both network firewalls outside of Security Onion and the host-based firewall built into Security Onion. Where is it that you cannot view them? 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. There are many ways to achieve age regression, but the three primary methods are: Botox. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. 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. You received this message because you are subscribed to the Google Groups "security-onion" group. To add local YARA rules, create a directory in /opt/so/saltstack/local/salt/strelka/rules, for example localrules. Any definitions made here will override anything defined in other pillar files, including global. . Inside of /opt/so/saltstack/local/salt/strelka/rules/localrules, add your YARA rules. As shown above, we edit the minion pillar and add the SID to the idstools - sids - disabled section. A. You need to configure Security Onion to send syslog so that InsightIDR can ingest it. By default, only the analyst hostgroup is allowed access to the nginx ports. Answered by weslambert on Dec 15, 2021. Global pillar file: This is the pillar file that can be used to make global pillar assignments to the nodes. 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. 1. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. Was this translation helpful? 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). 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. For example, consider the following rules that reference the ET.MSSQL flowbit. 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. Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: Paste the rule. Open /etc/nsm/rules/local.rules using your favorite text editor. A tag already exists with the provided branch name. When editing these files, please be very careful to respect YAML syntax, especially whitespace. If you would like to pull in NIDS rules from a MISP instance, please see: /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. For a Security Onion client, you should dedicate at least 2GB RAM, but ideally 4GB if possible. If it is, then the most expedient measure may be to resolve the misconfiguration and then reinvestigate tuning. After select all interfaces also ICMP logs not showing in sguil. Any pointers would be appreciated. Data collection Examination Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. At those times, it can be useful to query the database from the commandline. 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. From the Command Line. Security Onion is a platform that allows you to monitor your network for security alerts. 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. The territories controlled by the ROC consist of 168 islands, with a combined area of 36,193 square . It . jq; so-allow; so-elastic-auth; so . However, generating custom traffic to test the alert can sometimes be a challenge. If so, then tune the number of AF-PACKET workers for sniffing processes. Revision 39f7be52. 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. 3. /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. > To unsubscribe from this topic . For example, if you include a bad custom snort rule with incorrect syntax, the snort engine will fail . 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. Hi @Trash-P4nda , I've just updated the documentation to be clearer. This directory stores the firewall rules specific to your grid. 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 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! 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. Minion pillar file: This is the minion specific pillar file that contains pillar definitions for that node. Open /etc/nsm/rules/local.rules using your favorite text editor. 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. 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. 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. Copyright 2023 2. Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: These policy types can be found in /etc/nsm/rules/downloaded.rules. 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. 41 - Network Segmentation, VLANs, and Subnets. 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: [email protected], https://groups.google.com/group/security-onion. To get the best performance out of Security Onion, youll want to tune it for your environment. If you want to tune Wazuh HIDS alerts, please see the Wazuh section. We offer both training and support for Security Onion. 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. 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. For example, suppose we want to disable SID 2100498. You can learn more about snort and writing snort signatures from the Snort Manual. 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. It is located at /opt/so/saltstack/local/pillar/global.sls. Security Onion is an open-source and free Linux distribution for log management, enterprise security monitoring, and intrusion detection. 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). Security Onion generates a lot of valuable information for you the second you plug it into a TAP or SPAN port. /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. You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. . Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars.