By default, only the analyst hostgroup is allowed access to the nginx ports. Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. Download Security Onion 20110116. 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. You signed in with another tab or window. (Archived 1/22) Tuning NIDS Rules in Security Onion Security Onion 7.5K subscribers 48 Dislike Share 1,465 views Dec 22, 2021 This video has been archived as of January 2022 - the latest. After select all interfaces also ICMP logs not showing in sguil. 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. Once logs are generated by network sniffing processes or endpoints, where do they go? Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: Paste the rule. To configure syslog for Security Onion: Stop the Security Onion service. 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. When editing these files, please be very careful to respect YAML syntax, especially whitespace. It . /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. 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). When configuring network firewalls for distributed deployments, youll want to ensure that nodes can connect as shown below. 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. so-rule allows you to disable, enable, or modify NIDS rules. We can start by listing any currently disabled rules: Once that completes, we can then verify that 2100498 is now disabled with so-rule disabled list: Finally, we can check that 2100498 is commented out in /opt/so/rules/nids/all.rules: If you cant run so-rule, then you can modify configuration manually. Data collection Examination After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. Answered by weslambert on Dec 15, 2021. 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. Files here should not be modified as changes would be lost during a code update. 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. Adding local rules in Security Onion is a rather straightforward process. . (Alternatively, you can press Ctrl+Alt+T to open a new shell.) More information on each of these topics can be found in this section. Previously, in the case of an exception, the code would just pass. If you pivot from that alert to the corresponding pcap you can verify the payload we sent. Please update your bookmarks. When you purchase products and services from us, you're helping to fund development of Security Onion! Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. For more information, please see https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you dont want your network sensors to process. Some node types get their IP assigned to multiple host groups. If you want to tune Wazuh HIDS alerts, please see the Wazuh section. Minion pillar file: This is the minion specific pillar file that contains pillar definitions for that node. All node types are added to the minion host group to allow Salt communication. For more information about Salt, please see https://docs.saltstack.com/en/latest/. If . /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. If you would like to create a rule yourself and use it with Suricata, this guide might be helpful. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. 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 This is located at /opt/so/saltstack/local/pillar/minions/.sls. . Salt is a core component of Security Onion 2 as it manages all processes on all nodes. In order to apply the threshold to all nodes, place the pillar in /opt/so/saltstack/local/pillar/global.sls. Do you see these alerts in Squert or ELSA? If you are on a large network, you may need to do additional tuning like pinning processes to CPU cores. Saltstack states are used to ensure the state of objects on a minion. However, generating custom traffic to test the alert can sometimes be a challenge. In a distributed deployment, the manager node controls all other nodes via salt. /opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. . Please note that Suricata 6 has a 64-character limitation on the IP field in a threshold. 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 . Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. 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 { 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. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. Revision 39f7be52. We created and maintain Security Onion, so we know it better than anybody else. 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. Add the following to the sensor minion pillar file located at. Open /etc/nsm/rules/local.rules using your favorite text editor. 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. Enter the following sample in a line at a time. You can read more about this at https://redmine.openinfosecfoundation.org/issues/4377. 4. 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. If you want to apply the threshold to a single node, place the pillar in /opt/so/saltstack/local/pillar/minions/.sls. 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. Diagnostic logs can be found in /opt/so/log/salt/. 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. Local pillar file: This is the pillar file under /opt/so/saltstack/local/pillar/. . While Vanderburgh County was the seventh-largest county in 2010 population with 179,703 people, it is also the eighth-smallest county in area in Indiana and the smallest in southwestern Indiana, covering only 236 square miles (610 km2). The server is also responsible for ruleset management. 7.2. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. However, generating custom traffic to test the alert can sometimes be a challenge. Ingest. 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 right click on the, You can learn more about snort and writing snort signatures from the. You signed in with another tab or window. 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. 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! In the image below, we can see how we define some rules for an eval node. When editing these files, please be very careful to respect YAML syntax, especially whitespace. Next, run so-yara-update to pull down the 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. 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 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. 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. Interested in discussing how our products and services can help your organization? 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. In syslog-ng, the following configuration forwards all local logs to Security Onion. idstools may seem like it is ignoring your disabled rules request if you try to disable a rule that has flowbits set. Once your rules and alerts are under control, then check to see if you have packet loss. The county seat is in Evansville. 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. Introduction Adding local rules in Security Onion is a rather straightforward process. 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: security-onion+unsubscribe@googlegroups.com, https://groups.google.com/group/security-onion. How are they stored? Salt is a new approach to infrastructure management built on a dynamic communication bus. This writeup contains a listing of important Security Onion files and directories. 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. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you don't want your network sensors to process. 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 uses idstools to download new signatures every night and process them against a set list of user generated configurations. As shown above, we edit the minion pillar and add the SID to the idstools - sids - disabled section. Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. This directory stores the firewall rules specific to your grid. These non-manager nodes are referred to as salt minions. Revision 39f7be52. Please review the Salt section to understand pillars and templates. 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. Copyright 2023 Now that we have a signature that will generate alerts a little more selectively, we need to disable the original signature. 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. 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 . 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. A tag already exists with the provided branch name. For example, suppose we want to disable SID 2100498. Started by Doug Burks, and first released in 2009, Security Onion has. Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. 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. Adding local rules in Security Onion is a rather straightforward process. Here are some of the items that can be customized with pillar settings: Currently, the salt-minion service startup is delayed by 30 seconds. 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. idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. Beta This directory contains the default firewall rules. Revision 39f7be52. Security Onion generates a lot of valuable information for you the second you plug it into a TAP or SPAN port. PFA local.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. 41 - Network Segmentation, VLANs, and Subnets. However, the exception is now logged. You can add Wazuh HIDS rules in /opt/so/rules/hids/local_rules.xml. 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.