Security Onion is a intrusion detection and network monitoring tool. Find Age Regression Discord servers and make new friends! Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. Answered by weslambert on Dec 15, 2021. You could try testing a rule . epic charting system training As you can see I have the Security Onion machine connected within the internal network to a hub. This is located at /opt/so/saltstack/local/pillar/minions/.sls. 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. 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. Beta Generate some traffic to trigger the alert. We created and maintain Security Onion, so we know it better than anybody else. 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. You can learn more about snort and writing snort signatures from the Snort Manual. 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. You received this message because you are subscribed to the Google Groups "security-onion" group. 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. Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. Port groups are a way of grouping together ports similar to a firewall port/service alias. 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. /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. Salt can be used for data-driven orchestration, remote execution for any infrastructure, configuration management for any app stack, and much more. Custom rules can be added to the local.rules file Rule threshold entries can . 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. Are you sure you want to create this branch? You can do the reverse unit conversion from MPa to psi, or enter any two units below:LED MSI Optix G242 24 inch IPS Gaming Monitor - Full HD - 144Hz Refresh Rate - 1ms Response time - Adaptive Sync for Esports (9S6-3BA41T-039) LED MSI OPTIX G272 Gaming Monitor 27" FHD IPS 144HZ 1MS Adaptive Sync (9S6-3CB51T-036) LG 27 FHD IPS 1ms 240Hz G . Escalate local privileges to root level. . There are two directories that contain the yaml files for the firewall configuration. These are the files that will need to be changed in order to customize nodes. If you would like to pull in NIDS rules from a MISP instance, please see: Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. 5. 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. /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. Finally, run so-strelka-restart to allow Strelka to pull in the new 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. Interested in discussing how our products and services can help your organization? 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. How are they parsed? > > > > > > > > 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. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you don't want your network sensors to process. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. 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 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. 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. 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) Please provide the output of sostat-redacted, attaching as a plain text file, or by using a service like Pastebin.com. Local pillar file: This is the pillar file under /opt/so/saltstack/local/pillar/. Cleaning up local_rules.xml backup files older than 30 days. 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 security-onion When I run 'rule-update' it give an error that there are no rules in /usr/local/lib/snort_dynamicrules. Please update your bookmarks. Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. Diagnostic logs can be found in /opt/so/log/salt/. Tried as per your syntax, but still issue persists. IPS Policy the rule is missing a little syntax, maybe try: alert icmp any any -> $HOME_NET any (msg:"ICMP Testing"; sid:1000001; rev:1;). You need to configure Security Onion to send syslog so that InsightIDR can ingest it. Long-term you should only run the rules necessary for > your environment. Adding local rules in Security Onion is a rather straightforward process. Then tune your IDS rulesets. 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. Have you tried something like this, in case you are not getting traffic to $HOME_NET? in Sguil? Please review the Salt section to understand pillars and templates. Any line beginning with "#" can be ignored as it is a comment. 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? From https://docs.saltstack.com/en/latest/: Salt is a core component of Security Onion 2 as it manages all processes on all nodes. Give feedback. Identification. 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. . Copyright 2023 There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). 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. I went ahead and put in the below rules under /etc/nsm/local.rules and ran the rule-update command. 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. Revision 39f7be52. lawson cedars. Any pointers would be appreciated. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you dont want your network sensors to process. Then tune your IDS rulesets. Logs. 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. 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. This first sub-section will discuss network firewalls outside of Security Onion. Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. 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. From the Command Line. 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 In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. Salt sls files are in YAML format. When you run so-allow or so-firewall, it modifies this file to include the IP provided in the proper hostgroup. (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. 3. 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). we run SO in a distributed deployment and the manager doesn't run strelka but does run on the sensor, the paths however (/opt/so/saltstack/local/salt/strelka/rules) exist on the manger but not the sensor, I did find the default repo under opt/so/saltstack/default/salt/strelka/rules/ on the manager and I can run so-yara-update but not so-strelka-restart because its not running on the manager so I'm a little confused on where I should be putting the custom YARA rules because things don't line up with the documentation or I'm just getting super confused. 3. Some node types get their IP assigned to multiple host groups. 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. When you purchase products and services from us, you're helping to fund development of Security Onion! Security. I've just updated the documentation to be clearer. Set anywhere from 5 to 12 in the local_rules Kevin. Security Onion. If . Introduction Adding local rules in Security Onion is a rather straightforward process. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. If you pivot from that alert to the corresponding pcap you can verify the payload we sent. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. https://securityonion.net/docs/AddingLocalRules. To configure syslog for Security Onion: Stop the Security Onion service. Adding Your Own Rules . Copyright 2023 Start creating a file for your rule. Now that we have a signature that will generate alerts a little more selectively, we need to disable the original signature. jq; so-allow; so-elastic-auth; so . 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. 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. Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. The easiest way to test that our NIDS is working as expected might be to simply access http://testmynids.org/uid/index.html from a machine that is being monitored by Security Onion. If you built the rule correctly, then snort should be back up and running. You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. Tracking. There isnt much in here other than anywhere, dockernet, localhost and self. When configuring network firewalls for distributed deployments, youll want to ensure that nodes can connect as shown below. To get the best performance out of Security Onion, youll want to tune it for your environment. 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. You signed in with another tab or window. 41 - Network Segmentation, VLANs, and Subnets. You can learn more about scapy at secdev.org and itgeekchronicles.co.uk. After viewing your redacted sostat it seems that the ICMP and UDP rules are triggering: Are you using SO with in a VM? Now that the configuration is in place, you can either wait for the sensor to sync with Salt running on the manager, or you can force it to update its firewall by running the following from the manager: Add the required ports to the port group. This directory contains the default firewall rules. This is an advanced case and you most likely wont never need to modify these files. 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. In this file, the idstools section has a modify sub-section where you can add your modifications. Open /etc/nsm/rules/local.rules using your favorite text editor. 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 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. Before You Begin. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. If it is, then the most expedient measure may be to resolve the misconfiguration and then reinvestigate tuning. 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. These non-manager nodes are referred to as salt minions. For example, consider the following rules that reference the ET.MSSQL flowbit. Adding local rules in Security Onion is a rather straightforward process. Security Onion is a platform that allows you to monitor your network for security alerts. 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. 7.2. /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml defines custom port groups. Security Onion generates a lot of valuable information for you the second you plug it into a TAP or SPAN port. /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. The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. 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. Security Onion a free and open platform for intrusion detection, enterprise security monitoring, and log management. 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, These policy types can be found in /etc/nsm/rules/downloaded.rules. 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. Do you see these alerts in Squert or ELSA? The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. However, the exception is now logged. Can anyone tell me > > > > what I've done wrong please? Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. 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. Let's add a simple rule that will alert on the detection of a string in a tcp session. 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. 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. Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. /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.
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