In a distributed deployment, the manager node controls all other nodes via salt. Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. 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. Cleaning up local_rules.xml backup files older than 30 days. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. Security. If you were to add a search node, you would see its IP appear in both the minion and the search_node host groups. alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). . lawson cedars. 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). For example, suppose we want to disable SID 2100498. Security Onion uses idstools to download new signatures every night and process them against a set list of user generated configurations. Salt sls files are in YAML format. 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. All the following will need to be run from the manager. Security Onion is a intrusion detection and network monitoring tool. 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. 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. . 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. 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 . 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. 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. 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 In 2008, Doug Burks started working on Security Onion, a Linux distribution for intrusion detection, network security monitoring, and log management. You received this message because you are subscribed to the Google Groups "security-onion" group. However, generating custom traffic to test the alert can sometimes be a challenge. You may want to bump the SID into the 90,000,000 range and set the revision to 1. Revision 39f7be52. On Thursday, June 15, 2017 at 5:06:51 PM UTC+5:30, Wes wrote: Is it simply not triggering, or causing an error? To verify the Snort version, type in snort -Vand hit Enter. Salt is a new approach to infrastructure management built on a dynamic communication bus. In a distributed deployment, the manager node controls all other nodes via salt. 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 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. 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. Also ensure you run rule-update on the machine. . 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. Write your rule, see Rules Format and save it. 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. 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. Open /etc/nsm/rules/local.rules using your favorite text editor. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. 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. 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. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. Global pillar file: This is the pillar file that can be used to make global pillar assignments to the nodes. 4. Beta Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. Our documentation has moved to https://securityonion.net/docs/. 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. Any line beginning with "#" can be ignored as it is a comment. The county seat is in Evansville. Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. so-rule allows you to disable, enable, or modify NIDS rules. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. More information on each of these topics can be found in this section. However, generating custom traffic to test the alert can sometimes be a challenge. > > > > > > > > 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. Custom rules can be added to the local.rules file Rule threshold entries can . When editing these files, please be very careful to respect YAML syntax, especially whitespace. 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 is a platform that allows you to monitor your network for security alerts. Revision 39f7be52. Let's add a simple rule that will alert on the detection of a string in a tcp session. 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. Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. 3. c96 extractor. I went ahead and put in the below rules under /etc/nsm/local.rules and ran the rule-update command. 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. 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). Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. As shown above, we edit the minion pillar and add the SID to the idstools - sids - disabled section. Security Onion is an open-source and free Linux distribution for log management, enterprise security monitoring, and intrusion detection. 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. /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. Our products include both the Security Onion software and specialized hardware appliances that are built and tested to run Security Onion. The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. Please provide the output of sostat-redacted, attaching as a plain text file, or by using a service like Pastebin.com. If you want to tune Wazuh HIDS alerts, please see the Wazuh section. In this file, the idstools section has a modify sub-section where you can add your modifications. /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. Give feedback. 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. Adding local rules in Security Onion is a rather straightforward process. This directory contains the default firewall 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. 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, Run rule-update (this will merge local.rules into downloaded.rules, update. Started by Doug Burks, and first released in 2009, Security Onion has. For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. This directory stores the firewall rules specific to your grid. 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. If you do not see this alert, try checking to see if the rule is enabled in /opt/so/rules/nids/all.rules: Rulesets come with a large number of rules enabled (over 20,000 by default). You need to configure Security Onion to send syslog so that InsightIDR can ingest it. IPS Policy Identification. 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. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. To enable the Talos Subscriber ruleset in an already installed grid, modify the /opt/so/saltstack/local/pillar/minions/ file as follows: To add other remotely-accessible rulesets, add an entry under urls for the ruleset URL in /opt/so/saltstack/local/pillar/minions/: Copyright 2023 Naming convention: The collection of server processes has a server name separate from the hostname of the box. 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. Before You Begin. Please review the Salt section to understand pillars and templates. Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. A tag already exists with the provided branch name. Use one of the following examples in your console/terminal window: sudo nano local.rules sudo vim local.rules. Generate some traffic to trigger the alert. Security Onion Layers Ubuntu based OS Snort, Suricata Snorby Bro Sguil Squert 3. We offer both training and support for Security Onion. 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. By default, only the analyst hostgroup is allowed access to the nginx ports. This will add the host group to, Add the desired IPs to the host group. Security Onion is a free and open source platform for threat hunting, network security monitoring, and log management. Add the following to the sensor minion pillar file located at. Revision 39f7be52. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. 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. 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. 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. Can anyone tell me > > > > what I've done wrong please? After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. To unsubscribe from this group and stop receiving emails from it, send an email to security-onio.@googlegroups.com. Once logs are generated by network sniffing processes or endpoints, where do they go? 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. Copyright 2023 . All node types are added to the minion host group to allow Salt communication. 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). There are many ways to achieve age regression, but the three primary methods are: Botox. How are they parsed? 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. Files here should not be modified as changes would be lost during a code update. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. This repository has been archived by the owner on Apr 16, 2021. Tried as per your syntax, but still issue persists. 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. In a distributed Security Onion environment, you only need to change the configuration in the manager pillar and then all other nodes will get the updated rules automatically. 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. To add local YARA rules, create a directory in /opt/so/saltstack/local/salt/strelka/rules, for example localrules. Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. 7.2. Finally, run so-strelka-restart to allow Strelka to pull in the new rules. 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 We've been teaching Security Onion classes and providing Professional Services since 2014. If you would like to pull in NIDS rules from a MISP instance, please see: According to NIST, which step in the digital forensics process involves drawing conclusions from data? /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. 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 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. See above for suppress examples. 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. Full Name. 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. Please note! 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. Diagnostic logs can be found in /opt/so/log/salt/. In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. idstools may seem like it is ignoring your disabled rules request if you try to disable a rule that has flowbits set. Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. Adding local rules in Security Onion is a rather straightforward process. 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 should only run the rules necessary for your environment, so you may want to disable entire categories of rules that dont apply to you. 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. Copyright 2023 Please note that Suricata 6 has a 64-character limitation on the IP field in a threshold. Start creating a file for your rule. 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 Now that we have a signature that will generate alerts a little more selectively, we need to disable the original signature. 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. The error can be ignored as it is not an indication of any issue with the minions. The remainder of this section will cover the host firewall built into Security Onion. Long-term you should only run the rules necessary for > your environment. Salt can be used for data-driven orchestration, remote execution for any infrastructure, configuration management for any app stack, and much more. Modifying these values outside of so-allow or so-firewall could lead to problems accessing your existing hosts. It is located at /opt/so/saltstack/local/pillar/global.sls. 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. This first sub-section will discuss network firewalls outside of Security Onion. Logs. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. 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. Copyright 2023 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. Adding Your Own Rules . When configuring network firewalls for distributed deployments, youll want to ensure that nodes can connect as shown below. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. Security Onion generates a lot of valuable information for you the second you plug it into a TAP or SPAN port. 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. This writeup contains a listing of important Security Onion files and directories. Open /etc/nsm/rules/local.rules using your favorite text editor. If you are on a large network, you may need to do additional tuning like pinning processes to CPU cores. If you want to apply the threshold to a single node, place the pillar in /opt/so/saltstack/local/pillar/minions/.sls. For more information about Salt, please see https://docs.saltstack.com/en/latest/. The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. the rule is missing a little syntax, maybe try: alert icmp any any -> $HOME_NET any (msg:"ICMP Testing"; sid:1000001; rev:1;). 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. Salt sls files are in YAML format. This section will cover both network firewalls outside of Security Onion and the host-based firewall built into Security Onion. From the Command Line. 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. 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. 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,. Previously, in the case of an exception, the code would just pass. ELSA? in Sguil? That's what we'll discuss in this section. . Run so-rule without any options to see the help output: We can use so-rule to modify an existing NIDS rule. If . Generate some traffic to trigger the alert. 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. 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! Cannot retrieve contributors at this time. One thing you can do with it (and the one that most people are interested in) is to configure it for IDS mode. =========================================================================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=========================================================================. /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml defines custom port groups. Assuming you have Internet access, Security Onion will automatically update your NIDS rules on a daily basis. When I run sostat. You can learn more about scapy at secdev.org and itgeekchronicles.co.uk. Escalate local privileges to root level. 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. You may want to bump the SID into the 90,000,000 range and set the revision to 1. 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 Interested in discussing how our products and services can help your organization? 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. 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. MISP Rules. 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. "; 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). There are two directories that contain the yaml files for the firewall configuration. Managing firewall rules for all devices should be done from the manager node using either so-allow, so-firewall or, for advanced cases, manually editing the yaml files. However, generating custom traffic to test the alert can sometimes be a challenge. 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. These are the files that will need to be changed in order to customize nodes. As you can see I have the Security Onion machine connected within the internal network to a hub. Reboot into your new Security Onion installation and login using the username/password you specified in the previous step. 41 - Network Segmentation, VLANs, and Subnets. However, the exception is now logged. 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. 1. /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.