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 pillar file: This is the pillar file located under /opt/so/saltstack/default/pillar/. This directory contains the default firewall rules. Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. 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. Backing up current local_rules.xml file. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Salt is a new approach to infrastructure management built on a dynamic communication bus. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you dont want your network sensors to process. However, generating custom traffic to test the alert can sometimes be a challenge. 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. Please note that Suricata 6 has a 64-character limitation on the IP field in a threshold. Disabling all three of those rules by adding the following to disablesid.conf has the obvious negative effect of disabling all three of the rules: When you run sudo so-rule-update, watch the Setting Flowbit State section and you can see that if you disable all three (or however many rules share that flowbit) that the Enabled XX flowbits line is decremented and all three rules should then be disabled in your all.rules. However, the exception is now logged. 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. Some of these refer to areas where data is stored, while others point to configuration files that can be modified to change how Security Onion interacts with various tools. Use one of the following examples in your console/terminal window: sudo nano local.rules sudo vim local.rules. 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 . Open /etc/nsm/rules/local.rules using your favorite text editor. A. . You can then run curl http://testmynids.org/uid/index.html on the node to generate traffic which should cause this rule to alert (and the original rule that it was copied from, if it is enabled). You may want to bump the SID into the 90,000,000 range and set the revision to 1. Local pillar file: This is the pillar file under /opt/so/saltstack/local/pillar/. 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. Please provide the output of sostat-redacted, attaching as a plain text file, or by using a service like Pastebin.com. 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. I went ahead and put in the below rules under /etc/nsm/local.rules and ran the rule-update command. If you built the rule correctly, then snort should be back up and running. For example, if you include a bad custom snort rule with incorrect syntax, the snort engine will fail . and dont forget that the end is a semicolon and not a colon. 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 . . According to NIST, which step in the digital forensics process involves drawing conclusions from data? 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. All node types are added to the minion host group to allow Salt communication. More information on each of these topics can be found in this section. 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. This way, you still have the basic ruleset, but the situations in which they fire are altered. You can read more about this at https://redmine.openinfosecfoundation.org/issues/4377. 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. Youll need to ensure the first of the two properly escapes any characters that would be interpreted by regex. Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: 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 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. If this is a distributed deployment, edit local.rules on your master server and it will replicate to your sensors. 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. The firewall state is designed with the idea of creating port groups and host groups, each with their own alias or name, and associating the two in order to create an allow rule. Run rule-update (this will merge local.rules into downloaded.rules, update. This is an advanced case and you most likely wont never need to modify these files. You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. Files here should not be modified as changes would be lost during a code update. When you run so-allow or so-firewall, it modifies this file to include the IP provided in the proper hostgroup. /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. To unsubscribe from this group and stop receiving emails from it, send an email to. In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. First off, I'll briefly explain security onion security Onion is the leading open source operating system for network security monitoring, intrusion detection, log management and threat hunting. From https://docs.saltstack.com/en/latest/: Salt is a core component of Security Onion 2 as it manages all processes on all nodes. . If you want to tune Wazuh HIDS alerts, please see the Wazuh section. Copyright 2023 When I run sostat. 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. Custom rules can be added to the local.rules file Rule threshold entries can . 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 /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. For some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. Security Onion offers the following choices for rulesets to be used by Suricata. For a Security Onion client, you should dedicate at least 2GB RAM, but ideally 4GB if possible. > > > > > > > > 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. 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. Full Name. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. 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. ELSA? Adding local rules in Security Onion is a rather straightforward process. Introduction Adding local rules in Security Onion is a rather straightforward process. The rule categories are Malware-Cnc, Blacklist, SQL injection, Exploit-kit, and rules from the connectivity ruleset Security: CVSS Score of 8 or higher Vulnerability age is four years old and newer The rule categories include Balanced and Connectivity with one additional category being App-detect Previously, in the case of an exception, the code would just pass. How are they stored? After viewing your redacted sostat it seems that the ICMP and UDP rules are triggering: Are you using SO with in a VM? 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. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. 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. Now that we have a signature that will generate alerts a little more selectively, we need to disable the original signature. 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. Identification. 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). . Any definitions made here will override anything defined in other pillar files, including global. 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. Once logs are generated by network sniffing processes or endpoints, where do they go? In a distributed deployment, the manager node controls all other nodes via salt. To enable the Talos Subscriber ruleset in an already installed grid, modify the /opt/so/saltstack/local/pillar/minions/ file as follows: To add other remotely-accessible rulesets, add an entry under urls for the ruleset URL in /opt/so/saltstack/local/pillar/minions/: Copyright 2023 This error now occurs in the log due to a change in the exception handling within Salts event module. 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. Generate some traffic to trigger the alert. There isnt much in here other than anywhere, dockernet, localhost and self. You could try testing a rule . Logs. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. 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. 41 - Network Segmentation, VLANs, and Subnets. 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. Minion pillar file: This is the minion specific pillar file that contains pillar definitions for that node. Add the following to the sensor minion pillar file located at. 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. 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. Before You Begin. 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? After select all interfaces also ICMP logs not showing in sguil. 3. 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. (Alternatively, you can press Ctrl+Alt+T to open a new shell.) /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. In this file, the idstools section has a modify sub-section where you can add your modifications. 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. 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. Where is it that you cannot view them? Revision 39f7be52. /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. If so, then tune the number of AF-PACKET workers for sniffing processes. Backing up current downloaded.rules file before it gets overwritten. This writeup contains a listing of important Security Onion files and directories. /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. Generate some traffic to trigger the alert. As shown above, we edit the minion pillar and add the SID to the idstools - sids - disabled section. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. 7.2. 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. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you don't want your network sensors to process. idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. 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. To get the best performance out of Security Onion, youll want to tune it for your environment. If you want to apply the threshold to a single node, place the pillar in /opt/so/saltstack/local/pillar/minions/.sls. On Thursday, June 15, 2017 at 5:06:51 PM UTC+5:30, Wes wrote: Is it simply not triggering, or causing an error? 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. It is located at /opt/so/saltstack/local/pillar/global.sls. 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. And when I check, there are no rules there. Global pillar file: This is the pillar file that can be used to make global pillar assignments to the nodes. This repository has been archived by the owner on Apr 16, 2021. The signature id (SID) must be unique. Any line beginning with "#" can be ignored as it is a comment. /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. 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. 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/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. If you need to increase this delay, it can be done using the salt:minion:service_start_delay pillar. Please update your bookmarks. This will add the host group to, Add the desired IPs to the host group. Salt sls files are in YAML format. To unsubscribe from this group and stop receiving emails from it, send an email to security-onio.@googlegroups.com. For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. 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. 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. 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. Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: Paste the rule. Revision 39f7be52. 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. Security. At those times, it can be useful to query the database from the commandline. Manager of Support and Professional Services. 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) Security Onion is an open-source and free Linux distribution for log management, enterprise security monitoring, and intrusion detection. It . There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). You can use salts test.ping to verify that all your nodes are up: Similarly, you can use salts cmd.run to execute a command on all your nodes at once. 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. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. Give feedback. Tried as per your syntax, but still issue persists. When configuring network firewalls for distributed deployments, youll want to ensure that nodes can connect as shown below. 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. Please note! These non-manager nodes are referred to as salt minions. If you pivot from that alert to the corresponding pcap you can verify the payload we sent. 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. 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. These are the files that will need to be changed in order to customize 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. Finally, run so-strelka-restart to allow Strelka to pull in the new rules. 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. You signed in with another tab or window. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. Revision 39f7be52. Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. Check out our NIDS tuning video at https://youtu.be/1jEkFIEUCuI! 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. 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. Can anyone tell me > > > > what I've done wrong please? Security Onion has Snort built in and therefore runs in the same instance. Logs . Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. Adding local rules in Security Onion is a rather straightforward process. These policy types can be found in /etc/nsm/rules/downloaded.rules. However, generating custom traffic to test the alert can sometimes be a challenge. > To unsubscribe from this topic . 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. 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. Inside of /opt/so/saltstack/local/salt/strelka/rules/localrules, add your YARA rules. Also ensure you run rule-update on the machine. "; 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). Copyright 2023 Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Security Onion is a free and open source platform for threat hunting, network security monitoring, and log management. In a distributed deployment, the manager node controls all other nodes via salt. Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. 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 would like to pull in NIDS rules from a MISP instance, please see: 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. 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 Revision 39f7be52. Tracking. =========================================================================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=========================================================================. To add local YARA rules, create a directory in /opt/so/saltstack/local/salt/strelka/rules, for example localrules. This wiki is no longer maintained. To configure syslog for Security Onion: Stop the Security Onion service. Cleaning up local_rules.xml backup files older than 30 days. Revision 39f7be52. In the image below, we can see how we define some rules for an eval node. alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). You may want to bump the SID into the 90,000,000 range and set the revision to 1. jq; so-allow; so-elastic-auth; so . Next, run so-yara-update to pull down the rules. Find Age Regression Discord servers and make new friends! It is now read-only. Copyright 2023 However, generating custom traffic to test the alert can sometimes be a challenge. 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. Let's add a simple rule that will alert on the detection of a string in a tcp session. 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. lawson cedars. . If you need to manually update your rules, you can run the following on your manager node: If you have a distributed deployment and you update the rules on your manager node, then those rules will automatically replicate from the manager node to your sensors within 15 minutes.

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