Identification. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. . When editing these files, please be very careful to respect YAML syntax, especially whitespace. After select all interfaces also ICMP logs not showing in sguil. Security Onion has Snort built in and therefore runs in the same instance. Find Age Regression Discord servers and make new friends! This directory contains the default firewall rules. 5. No rules in /usr/local/lib/snort_dynamicrules - Google Groups The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. Adding local rules in Security Onion is a rather straightforward process. I went ahead and put in the below rules under /etc/nsm/local.rules and ran the rule-update command. In order to apply the threshold to all nodes, place the pillar in /opt/so/saltstack/local/pillar/global.sls. 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 we have a signature that will generate alerts a little more selectively, we need to disable the original signature. 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 Introduction to Sguil and Squert: Part 1 - Security Onion Cannot retrieve contributors at this time. Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. 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. When configuring network firewalls for distributed deployments, youll want to ensure that nodes can connect as shown below. . Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. 41 - Network Segmentation, VLANs, and Subnets. 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. Check out our NIDS tuning video at https://youtu.be/1jEkFIEUCuI! Nodes will be configured to pull from repocache.securityonion.net but this URL does not actually exist on the Internet, it is just a special address for the manager proxy. CCNA Cyber Ops (Version 1.1) - Chapter 12 Exam Answers Full 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. 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 It . (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. Use one of the following examples in your console/terminal window: sudo nano local.rules sudo vim local.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. Managing Rules Security Onion 2.3 documentation PFA local.rules. If you were to add a search node, you would see its IP appear in both the minion and the search_node host groups. This will add the host group to, Add the desired IPs to the host group. Local YARA rules Discussion #6556 Security-Onion - GitHub Inside of /opt/so/saltstack/local/salt/strelka/rules/localrules, add your YARA rules. Download Security Onion 20110116. Generate some traffic to trigger the alert. Add the following to the minions sls file located at. In a distributed deployment, the manager node controls all other nodes via salt. Open /etc/nsm/rules/local.rules using your favorite text editor. /opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. 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. Generate some traffic to trigger the alert. 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. 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. Security Onion Lab Setup with VirtualBox | Free Video Tutorial - Udemy 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. Data collection Examination One thing you can do with it (and the one that most people are interested in) is to configure it for IDS mode. Security Onion offers the following choices for rulesets to be used by Suricata. Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. 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! Modifying these values outside of so-allow or so-firewall could lead to problems accessing your existing hosts. Here are some of the items that can be customized with pillar settings: Currently, the salt-minion service startup is delayed by 30 seconds. 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. 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. Integrating Snort 3.0 (SnortSP) and Sguil in 3 Steps - Security Onion This repository has been archived by the owner on Apr 16, 2021. Are you sure you want to create this branch? Before You Begin. Minion pillar file: This is the minion specific pillar file that contains pillar definitions for that node. For more information about Salt, please see https://docs.saltstack.com/en/latest/. 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 Security. 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 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). If you need to increase this delay, it can be done using the salt:minion:service_start_delay pillar. Durian - Wikipedia The server is also responsible for ruleset management. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. Revision 39f7be52. This way, you still have the basic ruleset, but the situations in which they fire are altered. Security Onion is a platform that allows you to monitor your network for security alerts. To configure syslog for Security Onion: Stop the Security Onion service. 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. > To unsubscribe from this topic . jq; so-allow; so-elastic-auth; so . Security Onion Layers Ubuntu based OS Snort, Suricata Snorby Bro Sguil Squert In this file, the idstools section has a modify sub-section where you can add your modifications. 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. According to NIST, which step in the digital forensics process involves drawing conclusions from data? Security Onion uses idstools to download new signatures every night and process them against a set list of user generated configurations. 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. 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. Salt can be used for data-driven orchestration, remote execution for any infrastructure, configuration management for any app stack, and much more. Security Onion: A Linux Distro For IDS, NSM, And Log Management | Unixmen IPS Policy When I run sostat. A. Start creating a file for your rule. Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: Paste the rule. You may want to bump the SID into the 90,000,000 range and set the revision to 1. How are they stored? 'Re: [security-onion] Rule still triggering even after modifying to Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Beta At those times, it can be useful to query the database from the commandline. Tracking. Revision 39f7be52. Next, run so-yara-update to pull down the rules. Try checking /var/log/nsm/hostname-interface/snortu-1.log for clues and please post the exact rule syntax you are attempting to use. 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. Adding Local Rules Security Onion 2.3 documentation Local pillar file: This is the pillar file under /opt/so/saltstack/local/pillar/. Salt sls files are in YAML format. I've just updated the documentation to be clearer. Then tune your IDS rulesets. 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. 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. Revision 39f7be52. . Started by Doug Burks, and first released in 2009, Security Onion has. Basic snort rules syntax and usage [updated 2021] | Infosec Resources 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. If so, then tune the number of AF-PACKET workers for sniffing processes. 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. If you pivot from that alert to the corresponding pcap you can verify the payload we sent. These non-manager nodes are referred to as salt minions. You can learn more about scapy at secdev.org and itgeekchronicles.co.uk. 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. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. 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. Youll need to ensure the first of the two properly escapes any characters that would be interpreted by regex. To unsubscribe from this group and stop receiving emails from it, send an email to. 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. . 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 alerts are viewable in Alerts, Dashboards, Hunt, and Kibana. To add local YARA rules, create a directory in /opt/so/saltstack/local/salt/strelka/rules, for example localrules. . 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. Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. Security Onion | Web3us LLC If you would like to create a rule yourself and use it with Suricata, this guide might be helpful. /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. Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. These policy types can be found in /etc/nsm/rules/downloaded.rules. 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. Custom local.rules not showing up in kibana NIDS page #1712 - GitHub /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. Our products include both the Security Onion software and specialized hardware appliances that are built and tested to run Security Onion. If you would like to pull in NIDS rules from a MISP instance, please see the MISP Rules section. Port groups are a way of grouping together ports similar to a firewall port/service alias. This wiki is no longer maintained. Security onion troubleshooting - silvestermallorca.de All node types are added to the minion host group to allow Salt communication. Full Name. Boot the ISO and run through the installer. 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. FAQ Security-Onion-Solutions/security-onion Wiki GitHub 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. Check your syslog-ng configuration for the name of the local log source ("src" is used on SUSE systems). Answered by weslambert on Dec 15, 2021. 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. alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). You could try testing a rule . 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. Salt is a core component of Security Onion 2 as it manages all processes on all nodes. Can anyone tell me > > > > what I've done wrong please? 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. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. To get the best performance out of Security Onion, youll want to tune it for your environment. After viewing your redacted sostat it seems that the ICMP and UDP rules are triggering: Are you using SO with in a VM? 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. It is now read-only. /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. 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. Entry-Level Network Traffic Analysis with Security Onion - Totem Security Onion Documentation Security Onion 2.3 documentation 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. Security Onion Solutions the rule is missing a little syntax, maybe try: alert icmp any any -> $HOME_NET any (msg:"ICMP Testing"; sid:1000001; rev:1;). 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. and dont forget that the end is a semicolon and not a colon. 137 vi local.rules 138 sudo vi local.rules 139 vi cd .. 140 cd .. 141 vi securityonion.conf 142 sudo vi pulledpork/pulledpork.conf 143 sudo rule-update 144 history 145 vi rules/downloaded.rules 146 sudo vi local.rules 147 sudo vi rules/local.rules 160 sudo passwd david 161 sudo visudo 162 sudo vi rules/local.rules When you purchase products and services from us, you're helping to fund development of Security Onion! 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. Copyright 2023 . For example, if you include a bad custom snort rule with incorrect syntax, the snort engine will fail . ELSA? 7.2. Adding Your Own Rules Suricata 6.0.0 documentation - Read the Docs Security Onion | InsightIDR Documentation - Rapid7 Naming convention: The collection of server processes has a server name separate from the hostname of the box. Also ensure you run rule-update on the machine. MISP Rules. 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. In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. GitHub - security-onion-solutions/security-onion/wiki 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). Security Onion is a intrusion detection and network monitoring tool. Saltstack states are used to ensure the state of objects on a minion. Please provide the output of sostat-redacted, attaching as a plain text file, or by using a service like Pastebin.com. In a distributed deployment, the manager node controls all other nodes via salt. Files here should not be modified as changes would be lost during a code update. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you dont want your network sensors to process. This first sub-section will discuss network firewalls outside of Security Onion. Adding Your Own Rules . Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. When you run so-allow or so-firewall, it modifies this file to include the IP provided in the proper hostgroup. Revision 39f7be52. 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).