In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. This repository has been archived by the owner on Apr 16, 2021. The server is also responsible for ruleset management. Please note! Are you sure you want to create this branch? 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. 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. 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). Add the following to the sensor minion pillar file located at. Port groups are a way of grouping together ports similar to a firewall port/service alias. If you would like to pull in NIDS rules from a MISP instance, please see: Any definitions made here will override anything defined in other pillar files, including global. Logs . 1. This writeup contains a listing of important Security Onion files and directories. Let's add a simple rule that will alert on the detection of a string in a tcp session. (Alternatively, you can press Ctrl+Alt+T to open a new shell.) Please review the Salt section to understand pillars and templates. According to NIST, which step in the digital forensics process involves drawing conclusions from data? After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. Have you tried something like this, in case you are not getting traffic to $HOME_NET? In syslog-ng, the following configuration forwards all local logs to Security Onion. We've been teaching Security Onion classes and providing Professional Services since 2014. Security Onion. Please provide the output of sostat-redacted, attaching as a plain text file, or by using a service like Pastebin.com. . Salt is a new approach to infrastructure management built on a dynamic communication bus. Interested in discussing how our products and services can help your organization? Copyright 2023 Check out our NIDS tuning video at https://youtu.be/1jEkFIEUCuI! If you pivot from that alert to the corresponding pcap you can verify the payload we sent. The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. 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 These are the files that will need to be changed in order to customize nodes. 2. Our products include both the Security Onion software and specialized hardware appliances that are built and tested to run Security Onion. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. These non-manager nodes are referred to as salt minions. When configuring network firewalls for distributed deployments, youll want to ensure that nodes can connect as shown below. 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. 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 . 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. Try checking /var/log/nsm/hostname-interface/snortu-1.log for clues and please post the exact rule syntax you are attempting to use. 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. However, the exception is now logged. to security-onion When I run 'rule-update' it give an error that there are no rules in /usr/local/lib/snort_dynamicrules. (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. Files here should not be modified as changes would be lost during a code update. /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. Copyright 2023 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. 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. For example, suppose that we want to modify SID 2100498 and replace any instances of returned root with returned root test. Copyright 2023 Once logs are generated by network sniffing processes or endpoints, where do they go? Now that we have a signature that will generate alerts a little more selectively, we need to disable the original signature. Please keep this value below 90 seconds otherwise systemd will reach timeout and terminate the service. ELSA? 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! The remainder of this section will cover the host firewall built into Security Onion. Please update your bookmarks. Cleaning up local_rules.xml backup files older than 30 days. You could try testing a rule . 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. 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. 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. Give feedback. From https://docs.saltstack.com/en/latest/: Salt is a core component of Security Onion 2 as it manages all processes on all nodes. Please note that Suricata 6 has a 64-character limitation on the IP field in a threshold. The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. 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). Security Onion is an open-source and free Linux distribution for log management, enterprise security monitoring, and intrusion detection. Modifying these values outside of so-allow or so-firewall could lead to problems accessing your existing hosts. 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. There isnt much in here other than anywhere, dockernet, localhost and self. For some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. . If so, then tune the number of AF-PACKET workers for sniffing processes. 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. I went ahead and put in the below rules under /etc/nsm/local.rules and ran the rule-update command. 1. 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, Default YARA rules are provided from Florian Roths signature-base Github repo at https://github.com/Neo23x0/signature-base. Identification. A. 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. 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,. Security Onion a free and open platform for intrusion detection, enterprise security monitoring, and log management. In this file, the idstools section has a modify sub-section where you can add your modifications. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. In this step we are redefining the nginx port group, so be sure to include the default ports as well if you want to keep them: Associate this port group redefinition to a node. Minion pillar file: This is the minion specific pillar file that contains pillar definitions for that node. Copyright 2023 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. 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. Security Onion generates a lot of valuable information for you the second you plug it into a TAP or SPAN port. Copyright 2023 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. You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Reboot into your new Security Onion installation and login using the username/password you specified in the previous step. More information on each of these topics can be found in this 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. And when I check, there are no rules there. https://securityonion.net/docs/AddingLocalRules. This error now occurs in the log due to a change in the exception handling within Salts event module. 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. 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. The error can be ignored as it is not an indication of any issue with the minions. Set anywhere from 5 to 12 in the local_rules Kevin. Can anyone tell me > > > > what I've done wrong please? Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. jq; so-allow; so-elastic-auth; so . For more information, please see https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. 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. 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. https://docs.securityonion.net/en/2.3/local-rules.html?#id1. Find Age Regression Discord servers and make new friends! For example, suppose we want to disable SID 2100498. For example, consider the following rules that reference the ET.MSSQL flowbit. 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. This first sub-section will discuss network firewalls outside of Security Onion. Saltstack states are used to ensure the state of objects on a minion. 4. When configuring network firewalls for Internet-connected deployments (non-Airgap), youll want to ensure that the deployment can connect outbound to the following: In the case of a distributed deployment, you can configure your nodes to pull everything from the manager so that only the manager requires Internet access. Cannot retrieve contributors at this time. Next, run so-yara-update to pull down the rules. One thing you can do with it (and the one that most people are interested in) is to configure it for IDS mode. Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. If you right click on the, You can learn more about snort and writing snort signatures from the. It incorporates NetworkMiner, CyberChef, Squert, Sguil, Wazuh, Bro, Suricata, Snort, Kibana, Logstash, Elasticsearch, and numerous other security onion tools. Taiwan, officially the Republic of China (ROC), is a country in East Asia.It is located at the junction of the East and South China Seas in the northwestern Pacific Ocean, with the People's Republic of China (PRC) to the northwest, Japan to the northeast, and the Philippines to the south. Naming convention: The collection of server processes has a server name separate from the hostname of the box. 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. Assuming you have Internet access, Security Onion will automatically update your NIDS rules on a daily basis. Revision 39f7be52. If . You can learn more about scapy at secdev.org and itgeekchronicles.co.uk. If you would like to create a rule yourself and use it with Suricata, this guide might be helpful. Full Name. For a Security Onion client, you should dedicate at least 2GB RAM, but ideally 4GB if possible. 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. After viewing your redacted sostat it seems that the ICMP and UDP rules are triggering: Are you using SO with in a VM? As you can see I have the Security Onion machine connected within the internal network to a hub. Backing up current downloaded.rules file before it gets overwritten. 5. 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. Use one of the following examples in your console/terminal window: sudo nano local.rules sudo vim local.rules. If you built the rule correctly, then snort should be back up and running. In the image below, we can see how we define some rules for an eval node. Backing up current local_rules.xml file. Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. All node types are added to the minion host group to allow Salt communication. Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. Security Onion uses idstools to download new signatures every night and process them against a set list of user generated configurations. Write your rule, see Rules Format and save it. Revision 39f7be52. Open /etc/nsm/rules/local.rules using your favorite text editor. Tracking. 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. 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). The second only needs the $ character escaped to prevent bash from treating that as a variable. Adding Your Own Rules . At those times, it can be useful to query the database from the commandline. Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. epic charting system training 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. Security Onion has Snort built in and therefore runs in the same instance. Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: Paste the rule. In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. 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. 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. Data collection Examination 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.
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