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. 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. Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. securityonion-docs/local-rules.rst at master Security-Onion-Solutions Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. Copyright 2023 Syslog-ng and Security Onion 41 - Network Segmentation, VLANs, and Subnets. 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. Default YARA rules are provided from Florian Roths signature-base Github repo at https://github.com/Neo23x0/signature-base. 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. One thing you can do with it (and the one that most people are interested in) is to configure it for IDS mode. Salt minions must be able to connect to the manager node on ports, /opt/so/saltstack/local/pillar/global.sls, /opt/so/saltstack/local/pillar/minions/.sls, https://docs.saltproject.io/en/getstarted/system/communication.html, https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. If you right click on the, You can learn more about snort and writing snort signatures from the. 2. Revision 39f7be52. "; 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). Use one of the following examples in your console/terminal window: sudo nano local.rules sudo vim local.rules. =========================================================================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=========================================================================. This is an advanced case and you most likely wont never need to modify these files. 1. 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. 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 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. If you want to apply the threshold to a single node, place the pillar in /opt/so/saltstack/local/pillar/minions/.sls. This section will cover both network firewalls outside of Security Onion and the host-based firewall built into Security Onion. 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. Once logs are generated by network sniffing processes or endpoints, where do they go? 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 { You signed in with another tab or window. It is now read-only. To unsubscribe from this group and stop receiving emails from it, send an email to security-onio.@googlegroups.com. There isnt much in here other than anywhere, dockernet, localhost and self. 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. Find Age Regression Discord servers and make new friends! Salt can be used for data-driven orchestration, remote execution for any infrastructure, configuration management for any app stack, and much more. Check out our NIDS tuning video at https://youtu.be/1jEkFIEUCuI! Tuning NIDS Rules in Security Onion - YouTube If it is, then the most expedient measure may be to resolve the misconfiguration and then reinvestigate tuning. 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. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. . 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. Ingest. Security Onion has Snort built in and therefore runs in the same instance. If you previously added a host or network to your firewall configuration and now need to remove them, you can use so-firewall with the excludehost option. 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. For example, suppose that we want to modify SID 2100498 and replace any instances of returned root with returned root test. Firewall Security Onion 2.3 documentation 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. 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. Adding local rules in Security Onion is a rather straightforward process. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. lawson cedars. 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. To unsubscribe from this group and stop receiving emails from it, send an email to. Salt sls files are in YAML format. Open /etc/nsm/rules/local.rules using your favorite text editor. Logs . /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. 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. Cleaning up local_rules.xml backup files older than 30 days. 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. Convert PSI to MPA | Chapel Steel Convert psi to - francescolangella.it Enter the following sample in a line at a time. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. How to exclude IP After enabling all default Snort Rules - Google Groups All alerts are viewable in Alerts, Dashboards, Hunt, and Kibana. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. We've been teaching Security Onion classes and providing Professional Services since 2014. Salt Security Onion 2.3 documentation OSSEC custom rules not generating alerts - Google Groups 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. Local YARA rules Discussion #6556 Security-Onion - GitHub 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. Escalate local privileges to root level. In order to apply the threshold to all nodes, place the pillar in /opt/so/saltstack/local/pillar/global.sls. Manager of Support and Professional Services. This error now occurs in the log due to a change in the exception handling within Salts event module. (Alternatively, you can press Ctrl+Alt+T to open a new shell.) The files in this directory should not be modified as they could possibly be overwritten during a soup update in the event we update those files. 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. The second only needs the $ character escaped to prevent bash from treating that as a variable. This directory stores the firewall rules specific to your grid. . These non-manager nodes are referred to as salt minions. 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. Custom rules can be added to the local.rules file Rule threshold entries can . Security Onion is a intrusion detection and network monitoring tool. Managing Rules Security Onion 2.3 documentation Security Onion uses idstools to download new signatures every night and process them against a set list of user generated configurations. 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. PFA local.rules. To verify the Snort version, type in snort -Vand hit Enter. After viewing your redacted sostat it seems that the ICMP and UDP rules are triggering: Are you using SO with in a VM? 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/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. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. 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. To configure syslog for Security Onion: Stop the Security Onion service. Run so-rule without any options to see the help output: We can use so-rule to modify an existing NIDS rule. 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. When I run sostat. See above for suppress examples. Security Onion generates a lot of valuable information for you the second you plug it into a TAP or SPAN port. 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. However, generating custom traffic to test the alert can sometimes be a challenge. Next, run so-yara-update to pull down the rules. Naming convention: The collection of server processes has a server name separate from the hostname of the box. 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. 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. In a distributed deployment, the manager node controls all other nodes via salt. 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. Basic snort rules syntax and usage [updated 2021] | Infosec Resources We offer both training and support for Security Onion. Managing Alerts Security Onion 2.3 documentation Our documentation has moved to https://securityonion.net/docs/.