Any definitions made here will override anything defined in other pillar files, including global. Inside of /opt/so/saltstack/local/salt/strelka/rules/localrules, add your YARA rules. For example, suppose that we want to modify SID 2100498 and replace any instances of returned root with returned root test. This repository has been archived by the owner on Apr 16, 2021. 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. lawson cedars. 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. 3. 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. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. The server is also responsible for ruleset management. You received this message because you are subscribed to the Google Groups "security-onion" group. epic charting system training 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. 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. Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. Please update your bookmarks. (Alternatively, you can press Ctrl+Alt+T to open a new shell.) 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. It is now read-only. The second only needs the $ character escaped to prevent bash from treating that as a variable. 5. You can learn more about scapy at secdev.org and itgeekchronicles.co.uk. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you dont want your network sensors to process. Enter the following sample in a line at a time. 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. Then tune your IDS rulesets. For some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. In syslog-ng, the following configuration forwards all local logs to Security Onion. > > > > > > > > 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. Can anyone tell me > > > > what I've done wrong please? /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. 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. To unsubscribe from this group and stop receiving emails from it, send an email to. If . Start creating a file for your rule. 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. All node types are added to the minion host group to allow Salt communication. Security Onion offers the following choices for rulesets to be used by Suricata. Adding local rules in Security Onion is a rather straightforward process. You need to configure Security Onion to send syslog so that InsightIDR can ingest it. If it is, then the most expedient measure may be to resolve the misconfiguration and then reinvestigate tuning. If you built the rule correctly, then snort should be back up and running. We created and maintain Security Onion, so we know it better than anybody else. If you want to tune Wazuh HIDS alerts, please see the Wazuh section. Security Onion is a platform that allows you to monitor your network for security alerts. Previously, in the case of an exception, the code would just pass. You can learn more about snort and writing snort signatures from the Snort Manual. 2. 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. Copyright 2023 Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. 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. Our products include both the Security Onion software and specialized hardware appliances that are built and tested to run Security Onion. On Thursday, June 15, 2017 at 5:06:51 PM UTC+5:30, Wes wrote: Is it simply not triggering, or causing an error? Identification. Add the following to the minions sls file located at. 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 includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. Do you see these alerts in Squert or ELSA? 4. For more information, please see https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. This directory contains the default firewall rules. > > => I do not know how to do your guilde line. These non-manager nodes are referred to as salt minions. Are you sure you want to create this branch? 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. 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). Write your rule, see Rules Format and save it. This first sub-section will discuss network firewalls outside of Security Onion. . Where is it that you cannot view them? Revision 39f7be52. You signed in with another tab or window. Open /etc/nsm/rules/local.rules using your favorite text editor. We offer both training and support for Security Onion. See above for suppress examples. 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. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. 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 ->. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. 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. "; 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). For example, suppose we want to disable SID 2100498. c96 extractor. Security Onion is a free and open source platform for threat hunting, network security monitoring, and log management. Global pillar file: This is the pillar file that can be used to make global pillar assignments to the nodes. Revision 39f7be52. 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. /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. 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. Security. More information on each of these topics can be found in this section. If you would like to pull in NIDS rules from a MISP instance, please see: You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. Please provide the output of sostat-redacted, attaching as a plain text file, or by using a service like Pastebin.com. In order to apply the threshold to all nodes, place the pillar in /opt/so/saltstack/local/pillar/global.sls. It is located at /opt/so/saltstack/local/pillar/global.sls. /opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. You may want to bump the SID into the 90,000,000 range and set the revision to 1. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. Revision 39f7be52. There isnt much in here other than anywhere, dockernet, localhost and self. the rule is missing a little syntax, maybe try: alert icmp any any -> $HOME_NET any (msg:"ICMP Testing"; sid:1000001; rev:1;). ELSA? /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. Answered by weslambert on Dec 15, 2021. 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. Our documentation has moved to https://securityonion.net/docs/. 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. PFA local.rules. These non-manager nodes are referred to as salt minions. Use one of the following examples in your console/terminal window: sudo nano local.rules sudo vim local.rules. 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. This is an advanced case and you most likely wont never need to modify these files. Revision 39f7be52. Naming convention: The collection of server processes has a server name separate from the hostname of the box. 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. 7.2. Minion pillar file: This is the minion specific pillar file that contains pillar definitions for that node. If you are on a large network, you may need to do additional tuning like pinning processes to CPU cores. 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 jq; so-allow; so-elastic-auth; so . Data collection Examination (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. 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. 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. If you right click on the, You can learn more about snort and writing snort signatures from the. and dont forget that the end is a semicolon and not a colon. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. 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 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. Have you tried something like this, in case you are not getting traffic to $HOME_NET? These are the files that will need to be changed in order to customize nodes. 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. 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 I went ahead and put in the below rules under /etc/nsm/local.rules and ran the rule-update command. 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. alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). 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. Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. 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. According to NIST, which step in the digital forensics process involves drawing conclusions from data? There are two directories that contain the yaml files for the firewall configuration. 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. Security Onion generates a lot of valuable information for you the second you plug it into a TAP or SPAN port. Backing up current downloaded.rules file before it gets overwritten. Security Onion is an open-source and free Linux distribution for log management, enterprise security monitoring, and intrusion detection. Run rule-update (this will merge local.rules into downloaded.rules, update. 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. In this file, the idstools section has a modify sub-section where you can add your modifications. Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: To unsubscribe from this group and stop receiving emails from it, send an email to security-onio.@googlegroups.com. This wiki is no longer maintained. 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. 41 - Network Segmentation, VLANs, and Subnets. 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. 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. Before You Begin. However, generating custom traffic to test the alert can sometimes be a challenge. When editing these files, please be very careful to respect YAML syntax, especially whitespace. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. Introduction Adding local rules in Security Onion is a rather straightforward process. 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). Though each engine uses its own severity level system, Security Onion converts that to a standardized alert severity: event.severity: 4 ==> event.severity_label: critical, event.severity: 3 ==> event.severity_label: high, event.severity: 2 ==> event.severity_label: medium, event.severity: 1 ==> event.severity_label: low. Youll need to ensure the first of the two properly escapes any characters that would be interpreted by regex.