However, generating custom traffic to test the alert can sometimes be a challenge. Finally, run so-strelka-restart to allow Strelka to pull in the new rules. 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. Salt is a core component of Security Onion 2 as it manages all processes on all nodes. 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. 41 - Network Segmentation, VLANs, and Subnets. If you would like to pull in NIDS rules from a MISP instance, please see: Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: Paste the rule. Please keep this value below 90 seconds otherwise systemd will reach timeout and terminate the service. the rule is missing a little syntax, maybe try: alert icmp any any -> $HOME_NET any (msg:"ICMP Testing"; sid:1000001; rev:1;). > > > > > > > > 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. Copyright 2023 Data collection Examination =========================================================================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=========================================================================. 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. Reboot into your new Security Onion installation and login using the username/password you specified in the previous step. Once logs are generated by network sniffing processes or endpoints, where do they go? 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. Open /etc/nsm/rules/local.rules using your favorite text editor. Salt can be used for data-driven orchestration, remote execution for any infrastructure, configuration management for any app stack, and much more. At those times, it can be useful to query the database from the commandline. 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. Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. You can learn more about scapy at secdev.org and itgeekchronicles.co.uk. 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 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 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. This repository has been archived by the owner on Apr 16, 2021. 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 However, generating custom traffic to test the alert can sometimes be a challenge. 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. https://securityonion.net/docs/AddingLocalRules. Backing up current downloaded.rules file before it gets overwritten. Backing up current local_rules.xml file. You can learn more about snort and writing snort signatures from the Snort Manual. For example, if you include a bad custom snort rule with incorrect syntax, the snort engine will fail . 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. According to NIST, which step in the digital forensics process involves drawing conclusions from data? For more information, please see: # alert ip any any -> any any (msg:"GPL ATTACK_RESPONSE id check returned root"; content:"uid=0|28|root|29|"; classtype:bad-unknown; sid:2100498; rev:7; metadata:created_at 2010_09_23, updated_at 2010_09_23;), /opt/so/saltstack/local/pillar/minions/_.sls, "GPL ATTACK_RESPONSE id check returned root test", /opt/so/saltstack/default/pillar/thresholding/pillar.usage, /opt/so/saltstack/default/pillar/thresholding/pillar.example, /opt/so/saltstack/local/pillar/global.sls, /opt/so/saltstack/local/pillar/minions/.sls, https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html, https://redmine.openinfosecfoundation.org/issues/4377, https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. Please update your bookmarks. Adding local rules in Security Onion is a rather straightforward process. When you purchase products and services from us, you're helping to fund development of Security Onion! 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. Modifying these values outside of so-allow or so-firewall could lead to problems accessing your existing hosts. 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. In order to apply the threshold to all nodes, place the pillar in /opt/so/saltstack/local/pillar/global.sls. Please review the Salt section to understand pillars and templates. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. (Alternatively, you can press Ctrl+Alt+T to open a new shell.) Started by Doug Burks, and first released in 2009, Security Onion has. Generate some traffic to trigger the alert. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. To unsubscribe from this group and stop receiving emails from it, send an email to. The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. Run rule-update (this will merge local.rules into downloaded.rules, update. 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. If you want to apply the threshold to a single node, place the pillar in /opt/so/saltstack/local/pillar/minions/.sls. 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). For example, if you dont care that users are accessing Facebook, then you can silence the policy-based signatures for Facebook access. 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. This will add the IPs to the host group in, Since we reused the syslog port group that is already defined, we dont need to create a new port group. Any line beginning with "#" can be ignored as it is a comment. To get the best performance out of Security Onion, youll want to tune it for your environment. As you can see I have the Security Onion machine connected within the internal network to a hub. Before You Begin. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. 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. Ingest. . Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. Have you tried something like this, in case you are not getting traffic to $HOME_NET? Local pillar file: This is the pillar file under /opt/so/saltstack/local/pillar/. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. If you built the rule correctly, then snort should be back up and running. All node types are added to the minion host group to allow Salt communication. 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? You signed in with another tab or window. Revision 39f7be52. /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. 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. jq; so-allow; so-elastic-auth; so . Custom rules can be added to the local.rules file Rule threshold entries can . 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. For more information about Salt, please see https://docs.saltstack.com/en/latest/. Was this translation helpful? Security Onion. Security Onion is an open-source and free Linux distribution for log management, enterprise security monitoring, and intrusion detection. If you have multiple entries for the same SID, it will cause an error in salt resulting in all of the nodes in your grid to error out when checking in. Default pillar file: This is the pillar file located under /opt/so/saltstack/default/pillar/. Youll need to ensure the first of the two properly escapes any characters that would be interpreted by regex. Please provide the output of sostat-redacted, attaching as a plain text file, or by using a service like Pastebin.com. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. For example, consider the following rules that reference the ET.MSSQL flowbit. When I run sostat. If you were to add a search node, you would see its IP appear in both the minion and the search_node host groups. Add the following to the sensor minion pillar file located at. Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. 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 could try testing a rule . Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. > > => I do not know how to do your guilde line. A tag already exists with the provided branch name. 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. This first sub-section will discuss network firewalls outside of Security Onion. Try checking /var/log/nsm/hostname-interface/snortu-1.log for clues and please post the exact rule syntax you are attempting to use. Hi @Trash-P4nda , I've just updated the documentation to be clearer. 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. 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 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. A. I've just updated the documentation to be clearer. Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. The error can be ignored as it is not an indication of any issue with the minions. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. 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 can read more about this at https://redmine.openinfosecfoundation.org/issues/4377. This wiki is no longer maintained. Revision 39f7be52. For a Security Onion client, you should dedicate at least 2GB RAM, but ideally 4GB if possible. Enter the following sample in a line at a time. Set anywhere from 5 to 12 in the local_rules Kevin. 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. 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. If you need to increase this delay, it can be done using the salt:minion:service_start_delay pillar. Give feedback. 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. This will add the host group to, Add the desired IPs to the host group. Adding Your Own Rules . These policy types can be found in /etc/nsm/rules/downloaded.rules. I have had issues with Sguil when working with a snapshot and have not found a fix yet.. On Monday, June 26, 2017 at 8:28:44 PM UTC+5:30, KennyWap wrote: [email protected], https://groups.google.com/group/security-onion. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. 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. Cannot retrieve contributors at this time. 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. Cleaning up local_rules.xml backup files older than 30 days. 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. Adding local rules in Security Onion is a rather straightforward process. One thing you can do with it (and the one that most people are interested in) is to configure it for IDS mode. Then tune your IDS rulesets. If you would like to create a rule yourself and use it with Suricata, this guide might be helpful. To verify the Snort version, type in snort -Vand hit Enter. 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 On Thursday, June 15, 2017 at 5:06:51 PM UTC+5:30, Wes wrote: Is it simply not triggering, or causing an error? Also ensure you run rule-update on the machine. The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. For more information, please see https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. /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. 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. Security Onion is a platform that allows you to monitor your network for security alerts. The territories controlled by the ROC consist of 168 islands, with a combined area of 36,193 square . These are the files that will need to be changed in order to customize nodes. Port groups are a way of grouping together ports similar to a firewall port/service alias. lawson cedars. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. 3. This directory contains the default firewall rules. 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). We created and maintain Security Onion, so we know it better than anybody else. Please note! If it is, then the most expedient measure may be to resolve the misconfiguration and then reinvestigate tuning. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you dont want your network sensors to process. 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. For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. Copyright 2023 Generate some traffic to trigger the alert. Our documentation has moved to https://securityonion.net/docs/. It is now read-only. Security Onion offers the following choices for rulesets to be used by Suricata. This was implemented to avoid some issues that we have seen regarding Salt states that used the ip_interfaces grain to grab the management interface IP. However, generating custom traffic to test the alert can sometimes be a challenge. idstools may seem like it is ignoring your disabled rules request if you try to disable a rule that has flowbits set. Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. Any pointers would be appreciated. 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. You may want to bump the SID into the 90,000,000 range and set the revision to 1.