To add local YARA rules, create a directory in /opt/so/saltstack/local/salt/strelka/rules, for example localrules. 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. 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. I went ahead and put in the below rules under /etc/nsm/local.rules and ran the rule-update command. /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml defines custom port groups. /opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. For example, if you dont care that users are accessing Facebook, then you can silence the policy-based signatures for Facebook access. The remainder of this section will cover the host firewall built into Security Onion. 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. https://docs.securityonion.net/en/2.3/local-rules.html?#id1. Security Onion generates a lot of valuable information for you the second you plug it into a TAP or SPAN port. in Sguil? See above for suppress examples. If you want to tune Wazuh HIDS alerts, please see the Wazuh section. Answered by weslambert on Dec 15, 2021. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. 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. and dont forget that the end is a semicolon and not a colon. The signature id (SID) must be unique. A. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. 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). These are the files that will need to be changed in order to customize nodes. Hi @Trash-P4nda , I've just updated the documentation to be clearer. There isnt much in here other than anywhere, dockernet, localhost and self. Add the following to the minions sls file located at. 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, You can read more about this at https://redmine.openinfosecfoundation.org/issues/4377. To configure syslog for Security Onion: Stop the Security Onion service. 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. epic charting system training Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. Check out our NIDS tuning video at https://youtu.be/1jEkFIEUCuI! Identification. But after I run the rule-update command, no alert is generated in Sguil based on that rule.It was working when I first installed Security Onion. Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. When configuring network firewalls for distributed deployments, youll want to ensure that nodes can connect as shown below. When you run so-allow or so-firewall, it modifies this file to include the IP provided in the proper hostgroup. 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 { Run rule-update (this will merge local.rules into downloaded.rules, update. For more information, please see https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. 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. Salt sls files are in YAML format. One thing you can do with it (and the one that most people are interested in) is to configure it for IDS mode. Please provide the output of sostat-redacted, attaching as a plain text file, or by using a service like Pastebin.com. It . Also ensure you run rule-update on the machine. If so, then tune the number of AF-PACKET workers for sniffing processes. 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. Please note! alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). Salt can be used for data-driven orchestration, remote execution for any infrastructure, configuration management for any app stack, and much more. 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. 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. idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. jq; so-allow; so-elastic-auth; so . Revision 39f7be52. How are they parsed? This is an advanced case and you most likely wont never need to modify these files. Security. Where is it that you cannot view them? You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. Local pillar file: This is the pillar file under /opt/so/saltstack/local/pillar/. 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? 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. 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. =========================================================================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=========================================================================. 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 . All the following will need to be run from the manager. You signed in with another tab or window. I've just updated the documentation to be clearer. There are two directories that contain the yaml files for the firewall configuration. 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. The next run of idstools should then merge /opt/so/rules/nids/local.rules into /opt/so/rules/nids/all.rules which is what Suricata reads from. 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. 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. Copyright 2023 Logs . 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. This is located at /opt/so/saltstack/local/pillar/minions/.sls. 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. Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. 2. 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. You could try testing a rule . All node types are added to the minion host group to allow Salt communication. For more information about Salt, please see https://docs.saltstack.com/en/latest/. 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. 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. The county seat is in Evansville. ELSA? 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. Security Onion is a free and open source platform for threat hunting, network security monitoring, and log management. 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. Please update your bookmarks. Our documentation has moved to https://securityonion.net/docs/. For example, consider the following rules that reference the ET.MSSQL flowbit. Saltstack states are used to ensure the state of objects on a minion. As shown above, we edit the minion pillar and add the SID to the idstools - sids - disabled section. Inside of /opt/so/saltstack/local/salt/strelka/rules/localrules, add your YARA rules. If you would like to pull in NIDS rules from a MISP instance, please see: You signed in with another tab or window. Security Onion a free and open platform for intrusion detection, enterprise security monitoring, and log management. Please keep this value below 90 seconds otherwise systemd will reach timeout and terminate the service. Revision 39f7be52. 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. 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. Data collection Examination 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. The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. /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. According to NIST, which step in the digital forensics process involves drawing conclusions from data? If you were to add a search node, you would see its IP appear in both the minion and the search_node host groups. Adding local rules in Security Onion is a rather straightforward process. At those times, it can be useful to query the database from the commandline. Check your syslog-ng configuration for the name of the local log source ("src" is used on SUSE systems). 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. However, generating custom traffic to test the alert can sometimes be a challenge. 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. This repository has been archived by the owner on Apr 16, 2021. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. If you would like to create a rule yourself and use it with Suricata, this guide might be helpful. Before You Begin. You can find the latest version of this page at: https://securityonion.net/docs/AddingLocalRules. For example, if you include a bad custom snort rule with incorrect syntax, the snort engine will fail . It incorporates NetworkMiner, CyberChef, Squert, Sguil, Wazuh, Bro, Suricata, Snort, Kibana, Logstash, Elasticsearch, and numerous other security onion tools. That's what we'll discuss in this section. Copyright 2023 Files here should not be modified as changes would be lost during a code update. Youll need to ensure the first of the two properly escapes any characters that would be interpreted by regex. You can add Wazuh HIDS rules in /opt/so/rules/hids/local_rules.xml. Assuming you have Internet access, Security Onion will automatically update your NIDS rules on a daily basis. 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. 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. 3. /opt/so/saltstack/local/pillar/minions/, https://www.proofpoint.com/us/threat-insight/et-pro-ruleset, https://www.snort.org/downloads/#rule-downloads, https://www.snort.org/faq/what-are-community-rules, https://snort.org/documents/registered-vs-subscriber, license fee per sensor (users are responsible for purchasing enough licenses for their entire deployment), Snort SO (Shared Object) rules only work with Snort not, same rules as Snort Subscriber ruleset, except rules only retrievable after 30 days past release, not officially managed/supported by Security Onion. 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. If . Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you don't want your network sensors to process. . Security Onion has Snort built in and therefore runs in the same instance. https://securityonion.net/docs/AddingLocalRules. 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. Are you sure you want to create this branch? Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. 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 Was this translation helpful? 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. Generate some traffic to trigger the alert. 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 This error now occurs in the log due to a change in the exception handling within Salts event module. Open /etc/nsm/rules/local.rules using your favorite text editor. This will add the host group to, Add the desired IPs to the host group. Any definitions made here will override anything defined in other pillar files, including global.
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