Long-term you should only run the rules necessary for > your environment. to security-onion > > My rules is as follows: > > alert icmp any any -> (msg:"ICMP Testing"; sid:1000001; rev:1:) the rule is missing a little syntax, maybe try: alert icmp any any ->. There isnt much in here other than anywhere, dockernet, localhost and self. Security Onion generates a lot of valuable information for you the second you plug it into a TAP or SPAN port. 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. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. Adding local rules in Security Onion is a rather straightforward process. 41 - Network Segmentation, VLANs, and Subnets. Please note that Suricata 6 has a 64-character limitation on the IP field in a threshold. You can add Wazuh HIDS rules in /opt/so/rules/hids/local_rules.xml. Write your rule, see Rules Format and save it. Once your rules and alerts are under control, then check to see if you have packet loss. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. 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. Please review the Salt section to understand pillars and templates. If it is, then the most expedient measure may be to resolve the misconfiguration and then reinvestigate tuning. Hi @Trash-P4nda , I've just updated the documentation to be clearer. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. You are an adult, at least 18 years of age, you are familiar with and understand the standards and laws of your local community regarding sexually-oriented media. This 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. There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). All alerts are viewable in Alerts, Dashboards, Hunt, and Kibana. Data collection Examination https://docs.securityonion.net/en/2.3/local-rules.html?#id1. Security Onion is a intrusion detection and network monitoring tool. 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. When editing these files, please be very careful to respect YAML syntax, especially whitespace. However, generating custom traffic to test the alert can sometimes be a challenge. You received this message because you are subscribed to the Google Groups "security-onion" group. > > > > > > > > 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. Revision 39f7be52. These non-manager nodes are referred to as salt minions. and dont forget that the end is a semicolon and not a colon. 3. 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. Copyright 2023 When editing these files, please be very careful to respect YAML syntax, especially whitespace. There are two directories that contain the yaml files for the firewall configuration. Download Security Onion 20110116. Check out our NIDS tuning video at https://youtu.be/1jEkFIEUCuI! 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. And when I check, there are no rules there. Answered by weslambert on Dec 15, 2021. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. Our documentation has moved to https://securityonion.net/docs/. > To unsubscribe from this topic . 1. When you purchase products and services from us, you're helping to fund development of Security Onion! Assuming you have Internet access, Security Onion will automatically update your NIDS rules on a daily basis. You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. The remainder of this section will cover the host firewall built into Security Onion. Ingest. 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. Open /etc/nsm/rules/local.rules using your favorite text editor. To configure syslog for Security Onion: Stop the Security Onion service. Previously, in the case of an exception, the code would just pass. Full Name. These non-manager nodes are referred to as salt minions. Security Onion a free and open platform for intrusion detection, enterprise security monitoring, and log management. This is an advanced case and you most likely wont never need to modify these files. For example, suppose we want to disable SID 2100498. 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. 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. You may want to bump the SID into the 90,000,000 range and set the revision to 1. 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. /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. 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. Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. In 2008, Doug Burks started working on Security Onion, a Linux distribution for intrusion detection, network security monitoring, and log management. The error can be ignored as it is not an indication of any issue with the minions. If you want to tune Wazuh HIDS alerts, please see the Wazuh section. 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 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. 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. lawson cedars. (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. 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. If you built the rule correctly, then snort should be back up and running. Try checking /var/log/nsm/hostname-interface/snortu-1.log for clues and please post the exact rule syntax you are attempting to use. 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. 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! Security Onion is a platform that allows you to monitor your network for security alerts. Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. Can anyone tell me > > > > what I've done wrong please? . I've just updated the documentation to be clearer. Security Onion. We created and maintain Security Onion, so we know it better than anybody else. PFA local.rules. 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. Global pillar file: This is the pillar file that can be used to make global pillar assignments to the nodes. 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 server is also responsible for ruleset management. 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 rule is missing a little syntax, maybe try: alert icmp any any -> $HOME_NET any (msg:"ICMP Testing"; sid:1000001; rev:1;). 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. 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. 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 At those times, it can be useful to query the database from the commandline. A tag already exists with the provided branch name. 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? The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. 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 signed in with another tab or window. To get the best performance out of Security Onion, youll want to tune it for your environment. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. 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. When I run sostat. Are you sure you want to create this branch? /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. Started by Doug Burks, and first released in 2009, Security Onion has. Then tune your IDS rulesets. Logs . The county seat is in Evansville. . From https://docs.saltstack.com/en/latest/: Salt is a core component of Security Onion 2 as it manages all processes on all nodes. After viewing your redacted sostat it seems that the ICMP and UDP rules are triggering: Are you using SO with in a VM? It is now read-only. In a distributed deployment, the manager node controls all other nodes via salt. 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. Port groups are a way of grouping together ports similar to a firewall port/service alias. 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 . Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: You need to configure Security Onion to send syslog so that InsightIDR can ingest it. This writeup contains a listing of important Security Onion files and directories. Cleaning up local_rules.xml backup files older than 30 days. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. Diagnostic logs can be found in /opt/so/log/salt/. We offer both training and support for Security Onion. You can find the latest version of this page at: https://securityonion.net/docs/AddingLocalRules. Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. 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. 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. . If . Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. 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. For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. Generate some traffic to trigger the alert. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you dont want your network sensors to process. . 2. 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. Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. 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. For example, suppose that we want to modify SID 2100498 and replace any instances of returned root with returned root test. This first sub-section will discuss network firewalls outside of Security Onion. For some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. Salt is a new approach to infrastructure management built on a dynamic communication bus. 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. This way, you still have the basic ruleset, but the situations in which they fire are altered. so-rule allows you to disable, enable, or modify NIDS rules. Copyright 2023 Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you don't want your network sensors to process. 4. 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. 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. It incorporates NetworkMiner, CyberChef, Squert, Sguil, Wazuh, Bro, Suricata, Snort, Kibana, Logstash, Elasticsearch, and numerous other security onion tools. 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. For example, if you dont care that users are accessing Facebook, then you can silence the policy-based signatures for Facebook access. I went ahead and put in the below rules under /etc/nsm/local.rules and ran the rule-update command. 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. Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. 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. 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. Manager of Support and Professional Services. As shown above, we edit the minion pillar and add the SID to the idstools - sids - disabled section. 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). This section will cover both network firewalls outside of Security Onion and the host-based firewall built into Security Onion. We've been teaching Security Onion classes and providing Professional Services since 2014. This directory stores the firewall rules specific to your grid. Here are some of the items that can be customized with pillar settings: Currently, the salt-minion service startup is delayed by 30 seconds. If you want to apply the threshold to a single node, place the pillar in /opt/so/saltstack/local/pillar/minions/.sls. 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. Identification. "; 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). After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. 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. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. For more information about Salt, please see https://docs.saltstack.com/en/latest/. In syslog-ng, the following configuration forwards all local logs to Security Onion. When you run so-allow or so-firewall, it modifies this file to include the IP provided in the proper hostgroup. Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: Paste the rule. Some node types get their IP assigned to multiple host groups. 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. Find Age Regression Discord servers and make new friends! 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. 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. Adding Your Own Rules . You signed in with another tab or window. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Revision 39f7be52. Adding local rules in Security Onion is a rather straightforward process. For a Security Onion client, you should dedicate at least 2GB RAM, but ideally 4GB if possible. 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. Minion pillar file: This is the minion specific pillar file that contains pillar definitions for that node. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. . Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. This will add the host group to, Add the desired IPs to the host group. 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. However, generating custom traffic to test the alert can sometimes be a challenge. If you pivot from that alert to the corresponding pcap you can verify the payload we sent. Where is it that you cannot view them? If you need to increase this delay, it can be done using the salt:minion:service_start_delay pillar. Add the following to the minions sls file located at. 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. 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. On Thursday, June 15, 2017 at 5:06:51 PM UTC+5:30, Wes wrote: Is it simply not triggering, or causing an error? Host groups and port groups can be created or modified from the manager node using either so-allow, so-firewall or manually editing the yaml files.
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