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These non-manager nodes are referred to as salt minions. If you would like to pull in NIDS rules from a MISP instance, please see: Please note if you are using a ruleset that enables an IPS policy in /etc/nsm/pulledpork/pulledpork.conf, your local rules will be disabled. Adding Your Own Rules . All the following will need to be run from the manager. To verify the Snort version, type in snort -Vand hit Enter. 5. 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 this is a distributed deployment, edit local.rules on your master server and it will replicate to your sensors. 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. MISP Rules. Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: sudo vi /opt/so/rules/nids/local.rules Paste the rule. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. Security Onion is a intrusion detection and network monitoring tool. Are you sure you want to create this branch? If you would like to create a rule yourself and use it with Suricata, this guide might be helpful. . 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? Here are some of the items that can be customized with pillar settings: Currently, the salt-minion service startup is delayed by 30 seconds. The second only needs the $ character escaped to prevent bash from treating that as a variable. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. You can use salts test.ping to verify that all your nodes are up: Similarly, you can use salts cmd.run to execute a command on all your nodes at once. 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. 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. 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. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. Hi @Trash-P4nda , I've just updated the documentation to be clearer. Reboot into your new Security Onion installation and login using the username/password you specified in the previous step. This way, you still have the basic ruleset, but the situations in which they fire are altered. ELSA? . Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. 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 a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. That's what we'll discuss in this section. 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 . 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). 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. For a Security Onion client, you should dedicate at least 2GB RAM, but ideally 4GB if possible. Security Onion a free and open platform for intrusion detection, enterprise security monitoring, and log management. Any definitions made here will override anything defined in other pillar files, including global. The server is also responsible for ruleset management. Download Security Onion 20110116. Then tune your IDS rulesets. Find Age Regression Discord servers and make new friends! This error now occurs in the log due to a change in the exception handling within Salts event module. 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. The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. 3. Salt can be used for data-driven orchestration, remote execution for any infrastructure, configuration management for any app stack, and much more. This will add the host group to, Add the desired IPs to the host group. . Inside of /opt/so/saltstack/local/salt/strelka/rules/localrules, add your YARA rules. Copyright 2023 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! Escalate local privileges to root level. Manager of Support and Professional Services. lawson cedars. Any pointers would be appreciated. Then tune your IDS rulesets. 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. Please update your bookmarks. "; 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). Introduction Adding local rules in Security Onion is a rather straightforward process. in Sguil? 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 find the latest version of this page at: https://securityonion.net/docs/AddingLocalRules. 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. 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. Do you see these alerts in Squert or ELSA? 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. You can add Wazuh HIDS rules in /opt/so/rules/hids/local_rules.xml. 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. Please note that Suricata 6 has a 64-character limitation on the IP field in a threshold. Security Onion uses idstools to download new signatures every night and process them against a set list of user generated configurations. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. 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. 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. Let's add a simple rule that will alert on the detection of a string in a tcp session. In a distributed deployment, the manager node controls all other nodes via salt. 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. This directory contains the default firewall rules. Naming convention: The collection of server processes has a server name separate from the hostname of the box. Logs . 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. > > > > > > > > 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. If so, then tune the number of AF-PACKET workers for sniffing processes. However, the exception is now logged. 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. Add the following to the sensor minion pillar file located at. 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. Revision 39f7be52. Answered by weslambert on Dec 15, 2021. 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 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. Salt is a new approach to infrastructure management built on a dynamic communication bus. Assuming you have Internet access, Security Onion will automatically update your NIDS rules on a daily basis. 1. Before You Begin. Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. 41 - Network Segmentation, VLANs, and Subnets. In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml defines custom port groups. 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. (Alternatively, you can press Ctrl+Alt+T to open a new shell.) 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 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. However, generating custom traffic to test the alert can sometimes be a challenge. The territories controlled by the ROC consist of 168 islands, with a combined area of 36,193 square . You signed in with another tab or window. Revision 39f7be52. 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. There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). 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 . 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. 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. 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. /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. 7.2. and dont forget that the end is a semicolon and not a colon. Full Name. In order to apply the threshold to all nodes, place the pillar in /opt/so/saltstack/local/pillar/global.sls. Data collection Examination Have you tried something like this, in case you are not getting traffic to $HOME_NET? For example, suppose we want to disable SID 2100498. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. Adding local rules in Security Onion is a rather straightforward process. Cleaning up local_rules.xml backup files older than 30 days. Adding local rules in Security Onion is a rather straightforward process. 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). As you can see I have the Security Onion machine connected within the internal network to a hub. Security. Add the following to the minions sls file located at. These policy types can be found in /etc/nsm/rules/downloaded.rules. 4. 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. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Salt sls files are in YAML format. You may want to bump the SID into the 90,000,000 range and set the revision to 1. By default, only the analyst hostgroup is allowed access to the nginx ports. Cannot retrieve contributors at this time. c96 extractor. For example, if you include a bad custom snort rule with incorrect syntax, the snort engine will fail . Logs. This wiki is no longer maintained. When editing these files, please be very careful to respect YAML syntax, especially whitespace. It . > To unsubscribe from this topic . After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. 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. 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. We created and maintain Security Onion, so we know it better than anybody else. If you pivot from that alert to the corresponding pcap you can verify the payload we sent. . Global pillar file: This is the pillar file that can be used to make global pillar assignments to the nodes. 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. 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. Backing up current local_rules.xml file. Please keep this value below 90 seconds otherwise systemd will reach timeout and terminate the service. If you are on a large network, you may need to do additional tuning like pinning processes to CPU cores. https://securityonion.net/docs/AddingLocalRules. 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. On Thursday, June 15, 2017 at 5:06:51 PM UTC+5:30, Wes wrote: Is it simply not triggering, or causing an error? /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. 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. 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. Tried as per your syntax, but still issue persists. /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. When you purchase products and services from us, you're helping to fund development of Security Onion! Start creating a file for your rule. After viewing your redacted sostat it seems that the ICMP and UDP rules are triggering: Are you using SO with in a VM? This writeup contains a listing of important Security Onion files and directories. If you want to tune Wazuh HIDS alerts, please see the Wazuh section. 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. Copyright 2023 Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you don't want your network sensors to 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. 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. /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. I've just updated the documentation to be clearer. A tag already exists with the provided branch name. Run rule-update (this will merge local.rules into downloaded.rules, update. 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 I went ahead and put in the below rules under /etc/nsm/local.rules and ran the rule-update command. Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: Paste the rule. 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. Also ensure you run rule-update on the machine. 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. You signed in with another tab or window. Started by Doug Burks, and first released in 2009, Security Onion has. All node types are added to the minion host group to allow Salt communication. 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 { 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). 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. 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. . Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. The signature id (SID) must be unique. Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. 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. 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. 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. 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. For example, if you dont care that users are accessing Facebook, then you can silence the policy-based signatures for Facebook access. 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. Saltstack states are used to ensure the state of objects on a minion. This section will cover both network firewalls outside of Security Onion and the host-based firewall built into Security Onion. Once your rules and alerts are under control, then check to see if you have packet loss. Give feedback. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. 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,. For more information, please see https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. Modifying these values outside of so-allow or so-firewall could lead to problems accessing your existing hosts. Please note! Next, run so-yara-update to pull down the rules. This is an advanced case and you most likely wont never need to modify these files. 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. Local pillar file: This is the pillar file under /opt/so/saltstack/local/pillar/. 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 ->. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. 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 Copyright 2023 Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. This first sub-section will discuss network firewalls outside of Security Onion. 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 How are they stored? After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. For more information about Salt, please see https://docs.saltstack.com/en/latest/. 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. Open /etc/nsm/rules/local.rules using your favorite text editor. 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. Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. For example, consider the following rules that reference the ET.MSSQL flowbit. Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. Check out our NIDS tuning video at https://youtu.be/1jEkFIEUCuI! At those times, it can be useful to query the database from the commandline. Files here should not be modified as changes would be lost during a code update. If you right click on the, You can learn more about snort and writing snort signatures from the. 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 When editing these files, please be very careful to respect YAML syntax, especially whitespace. 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.