Copyright 2023 Please note that Suricata 6 has a 64-character limitation on the IP field in a threshold. This directory contains the default firewall rules. Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. Escalate local privileges to root level. Logs Security Onion 2.3 documentation 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. Run so-rule without any options to see the help output: We can use so-rule to modify an existing NIDS rule. Are you sure you want to create this branch? OSSEC custom rules not generating alerts - Google Groups Start creating a file for your rule. 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. If you pivot from that alert to the corresponding pcap you can verify the payload we sent. /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. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Backups; Docker; DNS Anomaly Detection; Endgame; ICMP Anomaly Detection; Jupyter Notebook; Machine Learning; Adding a new disk; PCAPs for Testing; Removing a Node; Syslog Output; UTC and Time Zones; Utilities. sigs.securityonion.net (Signature files for Security Onion containers) ghcr.io (Container downloads) rules.emergingthreatspro.com (Emerging Threats IDS rules) rules.emergingthreats.net (Emerging Threats IDS open rules) www.snort.org (Paid Snort Talos ruleset) github.com (Strelka and Sigma rules updates) Our documentation has moved to https://securityonion.net/docs/. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. Our products include both the Security Onion software and specialized hardware appliances that are built and tested to run Security Onion. Enter the following sample in a line at a time. 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. 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! Backing up current downloaded.rules file before it gets overwritten. Inside of /opt/so/saltstack/local/salt/strelka/rules/localrules, add your YARA rules. You signed in with another tab or window. the rule is missing a little syntax, maybe try: alert icmp any any -> $HOME_NET any (msg:"ICMP Testing"; sid:1000001; rev: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, Introduction to Sguil and Squert: Part 1 - Security Onion The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. Cleaning up local_rules.xml backup files older than 30 days. The server is also responsible for ruleset management. Salt Security Onion 2.3 documentation 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. 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 To verify the Snort version, type in snort -Vand hit Enter. When configuring network firewalls for distributed deployments, youll want to ensure that nodes can connect as shown below. If you built the rule correctly, then snort should be back up and running. /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. Integrating Snort 3.0 (SnortSP) and Sguil in 3 Steps - Security Onion Assuming you have Internet access, Security Onion will automatically update your NIDS rules on a daily basis. lawson cedars. Set anywhere from 5 to 12 in the local_rules Kevin. 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 Full Name. 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. Basic snort rules syntax and usage [updated 2021] | Infosec Resources How to exclude IP After enabling all default Snort Rules - Google Groups You signed in with another tab or window. Have you tried something like this, in case you are not getting traffic to $HOME_NET? Security Onion | Web3us LLC See above for suppress examples. /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. https://docs.securityonion.net/en/2.3/local-rules.html?#id1. Here are some of the items that can be customized with pillar settings: Currently, the salt-minion service startup is delayed by 30 seconds. In syslog-ng, the following configuration forwards all local logs to Security Onion. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. https://securityonion.net/docs/AddingLocalRules. Local YARA rules Discussion #6556 Security-Onion - GitHub Convert PSI to MPA | Chapel Steel Convert psi to - francescolangella.it Security Onion offers the following choices for rulesets to be used by Suricata. All the following will need to be run from the manager. Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. And when I check, there are no rules there. Re: [security-onion] Snort Local rules not getting alerts in ELSA / SQUERT idstools may seem like it is ignoring your disabled rules request if you try to disable a rule that has flowbits set. 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. It incorporates NetworkMiner, CyberChef, Squert, Sguil, Wazuh, Bro, Suricata, Snort, Kibana, Logstash, Elasticsearch, and numerous other security onion tools. Before You Begin. 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. If . From the Command Line. In the image below, we can see how we define some rules for an eval node. 41 - Network Segmentation, VLANs, and Subnets. All alerts are viewable in Alerts, Dashboards, Hunt, and Kibana. Naming convention: The collection of server processes has a server name separate from the hostname of the box. Identification. To get the best performance out of Security Onion, youll want to tune it for your environment. Youll need to ensure the first of the two properly escapes any characters that would be interpreted by regex. 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. The remainder of this section will cover the host firewall built into Security Onion. If you would like to create a rule yourself and use it with Suricata, this guide might be helpful. Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. . This will add the host group to, Add the desired IPs to the host group. 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. 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. We created and maintain Security Onion, so we know it better than anybody else. Where is it that you cannot view them? 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. When editing these files, please be very careful to respect YAML syntax, especially whitespace. According to NIST, which step in the digital forensics process involves drawing conclusions from data? 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). You can find the latest version of this page at: https://securityonion.net/docs/AddingLocalRules. 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. To add local YARA rules, create a directory in /opt/so/saltstack/local/salt/strelka/rules, for example localrules. and dont forget that the end is a semicolon and not a colon. Managing Alerts Security Onion 2.3 documentation For example, suppose that we want to modify SID 2100498 and replace any instances of returned root with returned root test. Salt sls files are in YAML format. 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. For more information, please see https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. Also ensure you run rule-update on the machine. Previously, in the case of an exception, the code would just pass. Copyright 2023 ELSA? Security Onion is an open-source and free Linux distribution for log management, enterprise security monitoring, and intrusion detection. After viewing your redacted sostat it seems that the ICMP and UDP rules are triggering: Are you using SO with in a VM? Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. How are they parsed? Any definitions made here will override anything defined in other pillar files, including global. "; 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). 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. You received this message because you are subscribed to the Google Groups "security-onion" group. In this file, the idstools section has a modify sub-section where you can add your modifications. FAQ Security-Onion-Solutions/security-onion Wiki GitHub If it is, then the most expedient measure may be to resolve the misconfiguration and then reinvestigate tuning. 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. 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. . These non-manager nodes are referred to as salt minions. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. 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 . Manager of Support and Professional Services. Salt is a core component of Security Onion 2 as it manages all processes on all nodes. 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. Then tune your IDS rulesets. /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. 2. Then tune your IDS rulesets. Finally, run so-strelka-restart to allow Strelka to pull in the new rules. 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. Let's add a simple rule that will alert on the detection of a string in a tcp session. Tracking. 7.2. Adding Your Own Rules Suricata 6.0.0 documentation - Read the Docs 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. Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. You can learn more about snort and writing snort signatures from the Snort Manual. This section will cover both network firewalls outside of Security Onion and the host-based firewall built into Security Onion. 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. These non-manager nodes are referred to as salt minions. MISP Rules. Important "Security Onion" Files and Directories - Medium If you would like to pull in NIDS rules from a MISP instance, please see the MISP Rules section. 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). Write your rule, see Rules Format and save it. You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. For some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.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.
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