Some node types get their IP assigned to multiple host groups. To unsubscribe from this group and stop receiving emails from it, send an email to security-onio.@googlegroups.com. After select all interfaces also ICMP logs not showing in sguil. 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. 1. 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. Files here should not be modified as changes would be lost during a code update. 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 want to apply the threshold to a single node, place the pillar in /opt/so/saltstack/local/pillar/minions/.sls. Long-term you should only run the rules necessary for > your environment. Tuning NIDS Rules in Security Onion - YouTube 0:00 / 15:12 Tuning NIDS Rules in Security Onion 1,511 views Jan 10, 2022 This video shows you how to tune Suricata NIDS rules in. You received this message because you are subscribed to the Google Groups "security-onion" group. alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). For some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. However, generating custom traffic to test the alert can sometimes be a challenge. Escalate local privileges to root level. In the image below, we can see how we define some rules for an eval node. Are you sure you want to create this branch? 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. Next, run so-yara-update to pull down the rules. Open /etc/nsm/rules/local.rules using your favorite text editor. Security. 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 When you purchase products and services from us, you're helping to fund development of Security Onion! MISP Rules. 3. The remainder of this section will cover the host firewall built into Security Onion. /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. 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 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. According to NIST, which step in the digital forensics process involves drawing conclusions from data? . If you would like to pull in NIDS rules from a MISP instance, please see the MISP Rules section. 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. 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. 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. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. This first sub-section will discuss network firewalls outside of Security Onion. Start creating a file for your rule. For example, if you dont care that users are accessing Facebook, then you can silence the policy-based signatures for Facebook access. If you dont want to wait 15 minutes, you can force the sensors to update immediately by running the following command on your manager node: Security Onion offers the following choices for rulesets to be used by Suricata. Before You Begin. Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: 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. idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. Interested in discussing how our products and services can help your organization? 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 security-onion > > My rules is as follows: > > alert icmp any any -> (msg:"ICMP Testing"; sid:1000001; rev:1:) the rule is missing a little syntax, maybe try: alert icmp any any ->. For a Security Onion client, you should dedicate at least 2GB RAM, but ideally 4GB if possible. . 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. 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. All node types are added to the minion host group to allow Salt communication. To verify the Snort version, type in snort -Vand hit Enter. "; 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). This way, you still have the basic ruleset, but the situations in which they fire are altered. Been looking to add some custom YARA rules and have been following the docs https://docs.securityonion.net/en/2.3/local-rules.html?#id1 however I'm a little confused. 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. Once your rules and alerts are under control, then check to see if you have packet loss. Set anywhere from 5 to 12 in the local_rules Kevin. Adding local rules in Security Onion is a rather straightforward process. 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 For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. 7.2. Adding Your Own Rules . Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. 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. so-rule allows you to disable, enable, or modify NIDS rules. Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. 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. 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. If you dont want to wait for these automatic processes, you can run them manually from the manager (replacing $SENSORNAME_$ROLE as necessary): Lets add a simple rule to /opt/so/saltstack/local/salt/idstools/local.rules thats really just a copy of the traditional id check returned root rule: Restart Suricata (replacing $SENSORNAME_$ROLE as necessary): If you built the rule correctly, then Suricata should be back up and running. /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. If it is, then the most expedient measure may be to resolve the misconfiguration and then reinvestigate tuning. IPS Policy It . Tracking. Run rule-update (this will merge local.rules into downloaded.rules, update. Check out our NIDS tuning video at https://youtu.be/1jEkFIEUCuI! However, generating custom traffic to test the alert can sometimes be a challenge. The territories controlled by the ROC consist of 168 islands, with a combined area of 36,193 square . Copyright 2023 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. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. The error can be ignored as it is not an indication of any issue with the minions. Security Onion a free and open platform for intrusion detection, enterprise security monitoring, and log management. 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. Download Security Onion 20110116. If you would like to pull in NIDS rules from a MISP instance, please see: Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. These non-manager nodes are referred to as salt minions. Local pillar file: This is the pillar file under /opt/so/saltstack/local/pillar/. 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. Once logs are generated by network sniffing processes or endpoints, where do they go? Salt can be used for data-driven orchestration, remote execution for any infrastructure, configuration management for any app stack, and much more. Beta Revision 39f7be52. Copyright 2023 Try checking /var/log/nsm/hostname-interface/snortu-1.log for clues and please post the exact rule syntax you are attempting to use. https://securityonion.net/docs/AddingLocalRules. 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. That's what we'll discuss in this section. Previously, in the case of an exception, the code would just pass. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. the rule is missing a little syntax, maybe try: alert icmp any any -> $HOME_NET any (msg:"ICMP Testing"; sid:1000001; rev:1;). As you can see I have the Security Onion machine connected within the internal network to a hub. 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. The server is also responsible for ruleset management. 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. 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). 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. Identification. 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. However, the exception is now logged. 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. Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. We created and maintain Security Onion, so we know it better than anybody else. On Thursday, June 15, 2017 at 5:06:51 PM UTC+5:30, Wes wrote: Is it simply not triggering, or causing an error? Started by Doug Burks, and first released in 2009, Security Onion has. When editing these files, please be very careful to respect YAML syntax, especially whitespace. The second only needs the $ character escaped to prevent bash from treating that as a variable. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. One thing you can do with it (and the one that most people are interested in) is to configure it for IDS mode. 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. 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. If you pivot from that alert to the corresponding pcap you can verify the payload we sent. . These policy types can be found in /etc/nsm/rules/downloaded.rules. These non-manager nodes are referred to as salt minions. Then tune your IDS rulesets. /opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. How are they parsed? You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. 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). This is an advanced case and you most likely wont never need to modify these files. Where is it that you cannot view them? To add local YARA rules, create a directory in /opt/so/saltstack/local/salt/strelka/rules, for example localrules. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. In a distributed deployment, the manager node controls all other nodes via salt. 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! 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). 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. You can learn more about scapy at secdev.org and itgeekchronicles.co.uk. Our documentation has moved to https://securityonion.net/docs/. There are many ways to achieve age regression, but the three primary methods are: Botox. 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. Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. From the Command Line. and dont forget that the end is a semicolon and not a colon. In this file, the idstools section has a modify sub-section where you can add your modifications. In order to apply the threshold to all nodes, place the pillar in /opt/so/saltstack/local/pillar/global.sls. ELSA? You may want to bump the SID into the 90,000,000 range and set the revision to 1. If you need to increase this delay, it can be done using the salt:minion:service_start_delay pillar. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you dont want your network sensors to process. Adding local rules in Security Onion is a rather straightforward process. 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. 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. 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 { In syslog-ng, the following configuration forwards all local logs to Security Onion. Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Please note! Finally, run so-strelka-restart to allow Strelka to pull in the new rules. Logs . Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. idstools may seem like it is ignoring your disabled rules request if you try to disable a rule that has flowbits set. c96 extractor. The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. Youll need to ensure the first of the two properly escapes any characters that would be interpreted by regex. 1. 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. It is located at /opt/so/saltstack/local/pillar/global.sls. Have you tried something like this, in case you are not getting traffic to $HOME_NET? Adding local rules in Security Onion is a rather straightforward process. 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. Please keep this value below 90 seconds otherwise systemd will reach timeout and terminate the service. Any definitions made here will override anything defined in other pillar files, including global. A tag already exists with the provided branch name. 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, Tried as per your syntax, but still issue persists. 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. I went ahead and put in the below rules under /etc/nsm/local.rules and ran the rule-update command. 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. Security Onion has Snort built in and therefore runs in the same instance. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. And when I check, there are no rules there. 41 - Network Segmentation, VLANs, and Subnets. Security Onion uses idstools to download new signatures every night and process them against a set list of user generated configurations. Custom rules can be added to the local.rules file Rule threshold entries can . 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. 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. 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 . To unsubscribe from this group and stop receiving emails from it, send an email to. 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 . Any line beginning with "#" can be ignored as it is a comment. 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. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml defines custom port groups. 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. 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. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Please update your bookmarks. > To unsubscribe from this topic . To enable the ET Pro ruleset in an already installed grid, modify the /opt/so/saltstack/local/pillar/minions/ file as follows: Since Shared Object rules wont work with Suricata, you may want to disable them using a regex like 're:soid [0-9]+' as described in the Managing Alerts section. Use one of the following examples in your console/terminal window: sudo nano local.rules sudo vim local.rules. However, generating custom traffic to test the alert can sometimes be a challenge. 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 Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. By default, only the analyst hostgroup is allowed access to the nginx ports. Security Onion is a free and open-source Linux distribution prepared for intrusion detection, security monitoring, and log management with the assistance of security tools namely Snort,. lawson cedars. 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. 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. 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. /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. Any pointers would be appreciated. You can add Wazuh HIDS rules in /opt/so/rules/hids/local_rules.xml. Then tune your IDS rulesets. Add the following to the sensor minion pillar file located at. Revision 39f7be52. You do not have permission to delete messages in this group, Either email addresses are anonymous for this group or you need the view member email addresses permission to view the original message. Also ensure you run rule-update on the machine.