Any line beginning with "#" can be ignored as it is a comment. Run so-rule without any options to see the help output: We can use so-rule to modify an existing NIDS rule. We created and maintain Security Onion, so we know it better than anybody else. Beta 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 tune Wazuh HIDS alerts, please see the Wazuh section. The county seat is in Evansville. Enter the following sample in a line at a time. Reboot into your new Security Onion installation and login using the username/password you specified in the previous step. 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). idstools may seem like it is ignoring your disabled rules request if you try to disable a rule that has flowbits set. so-rule allows you to disable, enable, or modify NIDS rules. To verify the Snort version, type in snort -Vand hit Enter. 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. Try checking /var/log/nsm/hostname-interface/snortu-1.log for clues and please post the exact rule syntax you are attempting to use. Default pillar file: This is the pillar file located under /opt/so/saltstack/default/pillar/. > > => I do not know how to do your guilde line. 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. 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. Security Onion. When editing these files, please be very careful to respect YAML syntax, especially whitespace. Adding Your Own Rules . In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. I went ahead and put in the below rules under /etc/nsm/local.rules and ran the rule-update command. Adding local rules in Security Onion is a rather straightforward process. More information on each of these topics can be found in this section. 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 Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. For example, suppose that we want to modify SID 2100498 and replace any instances of returned root with returned root test. According to NIST, which step in the digital forensics process involves drawing conclusions from data? 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. At those times, it can be useful to query the database from the commandline. These are the files that will need to be changed in order to customize nodes. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. 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, Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: Paste the rule. This directory contains the default firewall rules. 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. Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. It incorporates NetworkMiner, CyberChef, Squert, Sguil, Wazuh, Bro, Suricata, Snort, Kibana, Logstash, Elasticsearch, and numerous other security onion tools. There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). Introduction Adding local rules in Security Onion is a rather straightforward process. This wiki is no longer maintained. /opt/so/saltstack/default/salt/firewall/portgroups.yaml, /opt/so/saltstack/default/salt/firewall/hostgroups.yaml, /opt/so/saltstack/default/salt/firewall/assigned_hostgroups.map.yaml, /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml, /opt/so/saltstack/local/salt/firewall/hostgroups.local.yaml, /opt/so/saltstack/local/salt/firewall/assigned_hostgroups.local.map.yaml, /opt/so/saltstack/local/pillar/minions/_.sls, Allow hosts to send syslog to a sensor node, raw.githubusercontent.com (Security Onion public key), sigs.securityonion.net (Signature files for Security Onion containers), rules.emergingthreatspro.com (Emerging Threats IDS rules), rules.emergingthreats.net (Emerging Threats IDS open rules), github.com (Strelka and Sigma rules updates), geoip.elastic.co (GeoIP updates for Elasticsearch), storage.googleapis.com (GeoIP updates for Elasticsearch), download.docker.com (Docker packages - Ubuntu only), repo.saltstack.com (Salt packages - Ubuntu only), packages.wazuh.com (Wazuh packages - Ubuntu only), 3142 (Apt-cacher-ng) (if manager proxy enabled, this is repocache.securityonion.net as mentioned above), Create a new host group that will contain the IPs of the hosts that you want to allow to connect to the sensor. Use one of the following examples in your console/terminal window: sudo nano local.rules sudo vim local.rules. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. The signature id (SID) must be unique. 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. Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. 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). Any pointers would be appreciated. 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. 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 { All node types are added to the minion host group to allow Salt communication. The server is also responsible for ruleset management. However, generating custom traffic to test the alert can sometimes be a challenge. 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. /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. Please note! Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. See above for suppress examples. In a distributed deployment, the manager node controls all other nodes via salt. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. You signed in with another tab or window. 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 lawson cedars. 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). . Revision 39f7be52. For example, suppose we want to disable SID 2100498. 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. Revision 39f7be52. Revision 39f7be52. 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. We've been teaching Security Onion classes and providing Professional Services since 2014. The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. There isnt much in here other than anywhere, dockernet, localhost and self. 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. 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. You can add Wazuh HIDS rules in /opt/so/rules/hids/local_rules.xml. Backing up current downloaded.rules file before it gets overwritten. 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. 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. 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. To configure syslog for Security Onion: Stop the Security Onion service. That's what we'll discuss in this section. These non-manager nodes are referred to as salt minions. However, generating custom traffic to test the alert can sometimes be a challenge. c96 extractor. By default, only the analyst hostgroup is allowed access to the nginx ports. As you can see I have the Security Onion machine connected within the internal network to a hub. Naming convention: The collection of server processes has a server name separate from the hostname of the box. Any definitions made here will override anything defined in other pillar files, including global. If you need to increase this delay, it can be done using the salt:minion:service_start_delay pillar. 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. If you would like to pull in NIDS rules from a MISP instance, please see the MISP Rules section. Before You Begin. This directory stores the firewall rules specific to your grid. 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. 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. For a Security Onion client, you should dedicate at least 2GB RAM, but ideally 4GB if possible. Logs . Salt is a new approach to infrastructure management built on a dynamic communication bus. 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 Local pillar file: This is the pillar file under /opt/so/saltstack/local/pillar/. Copyright 2023 You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. Salt is a core component of Security Onion 2 as it manages all processes on all nodes. 2. If you built the rule correctly, then snort should be back up and running. In order to apply the threshold to all nodes, place the pillar in /opt/so/saltstack/local/pillar/global.sls. 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). /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. 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. Start creating a file for your rule. Here, we will show you how to add the local rule and then use the python library scapy 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. Have you tried something like this, in case you are not getting traffic to $HOME_NET? You can read more about this at https://redmine.openinfosecfoundation.org/issues/4377. All alerts are viewable in Alerts, Dashboards, Hunt, and Kibana. The error can be ignored as it is not an indication of any issue with the minions. 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 Can anyone tell me > > > > what I've done wrong please? Network Security Monitoring, as a practice, is not a solution you can plug into your network, make sure you see blinking lights and tell people you are secure. It requires active intervention from an analyst to qualify the quantity of information presented. 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? (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. . It is now read-only. 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. Open /etc/nsm/rules/local.rules using your favorite text editor. idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. 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 . Youll need to ensure the first of the two properly escapes any characters that would be interpreted by regex. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. A. Answered by weslambert on Dec 15, 2021. 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. If . Adding local rules in Security Onion is a rather straightforward process.
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