A tag already exists with the provided branch name. 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. This is located at /opt/so/saltstack/local/pillar/minions/.sls. For more information, please see https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. Any pointers would be appreciated. It is located at /opt/so/saltstack/local/pillar/global.sls. Default pillar file: This is the pillar file located under /opt/so/saltstack/default/pillar/. 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. I've just updated the documentation to be clearer. 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. By default, only the analyst hostgroup is allowed access to the nginx ports. Naming convention: The collection of server processes has a server name separate from the hostname of the box. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. This way, you still have the basic ruleset, but the situations in which they fire are altered. (Alternatively, you can press Ctrl+Alt+T to open a new shell.) For example, suppose we want to disable SID 2100498. Default YARA rules are provided from Florian Roths signature-base Github repo at https://github.com/Neo23x0/signature-base. 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. This wiki is no longer maintained. For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. Our documentation has moved to https://securityonion.net/docs/. Saltstack states are used to ensure the state of objects on a minion. 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. Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. 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. 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 read more about this at https://redmine.openinfosecfoundation.org/issues/4377. 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. To unsubscribe from this group and stop receiving emails from it, send an email to security-onio.@googlegroups.com. 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 Introduction Adding local rules in Security Onion is a rather straightforward process. This first sub-section will discuss network firewalls outside of Security Onion. 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. > > > > > > > > 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. Add the following to the sensor minion pillar file located at. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. Run rule-update (this will merge local.rules into downloaded.rules, update. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you don't want your network sensors to process. Open /etc/nsm/rules/local.rules using your favorite text editor. in Sguil? These policy types can be found in /etc/nsm/rules/downloaded.rules. 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, 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! Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. All node types are added to the minion host group to allow Salt communication. The second only needs the $ character escaped to prevent bash from treating that as a variable. Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. MISP Rules. In this file, the idstools section has a modify sub-section where you can add your modifications. To enable the Talos Subscriber ruleset in an already installed grid, modify the /opt/so/saltstack/local/pillar/minions/ file as follows: To add other remotely-accessible rulesets, add an entry under urls for the ruleset URL in /opt/so/saltstack/local/pillar/minions/: Copyright 2023 Adding local rules in Security Onion is a rather straightforward process. For more information about Salt, please see https://docs.saltstack.com/en/latest/. 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). 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. 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. Revision 39f7be52. Files here should not be modified as changes would be lost during a code update. 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. Long-term you should only run the rules necessary for > your environment. If you right click on the, You can learn more about snort and writing snort signatures from the. If so, then tune the number of AF-PACKET workers for sniffing processes. From the Command Line. All the following will need to be run from the manager. Now that we have a signature that will generate alerts a little more selectively, we need to disable the original signature. "; 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). However, generating custom traffic to test the alert can sometimes be a challenge. You can add Wazuh HIDS rules in /opt/so/rules/hids/local_rules.xml. 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. 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. Logs . Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you dont want your network sensors to process. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. Finally, run so-strelka-restart to allow Strelka to pull in the new rules. Beta Revision 39f7be52. Salt can be used for data-driven orchestration, remote execution for any infrastructure, configuration management for any app stack, and much more. . Open /etc/nsm/rules/local.rules using your favorite text editor. so-rule allows you to disable, enable, or modify NIDS rules. 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. 1. Custom rules can be added to the local.rules file Rule threshold entries can . 2. To unsubscribe from this group and stop receiving emails from it, send an email to. It is now read-only. For example, suppose that we want to modify SID 2100498 and replace any instances of returned root with returned root test. and dont forget that the end is a semicolon and not a colon. Diagnostic logs can be found in /opt/so/log/salt/. Ingest. 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. Once logs are generated by network sniffing processes or endpoints, where do they go? . Some node types get their IP assigned to multiple host groups. Before You Begin. 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 . Backing up current downloaded.rules file before it gets overwritten. Next, run so-yara-update to pull down the rules. > To unsubscribe from this topic . One thing you can do with it (and the one that most people are interested in) is to configure it for IDS mode. Please keep this value below 90 seconds otherwise systemd will reach timeout and terminate the service. According to NIST, which step in the digital forensics process involves drawing conclusions from data? 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. 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. This writeup contains a listing of important Security Onion files and directories. sigs.securityonion.net (Signature files for Security Onion containers) ghcr.io (Container downloads) rules.emergingthreatspro.com (Emerging Threats IDS rules) rules.emergingthreats.net (Emerging Threats IDS open rules) www.snort.org (Paid Snort Talos ruleset) github.com (Strelka and Sigma rules updates) The error can be ignored as it is not an indication of any issue with the minions. Salt is a new approach to infrastructure management built on a dynamic communication bus. When configuring network firewalls for distributed deployments, youll want to ensure that nodes can connect as shown below. If you want to tune Wazuh HIDS alerts, please see the Wazuh section. There isnt much in here other than anywhere, dockernet, localhost and self. /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. On Thursday, June 15, 2017 at 5:06:51 PM UTC+5:30, Wes wrote: Is it simply not triggering, or causing an error? Write your rule, see Rules Format and save it. For some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. 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 Layers Ubuntu based OS Snort, Suricata Snorby Bro Sguil Squert More information on each of these topics can be found in this section. Security Onion Peel Back the Layers of Your Enterprise Monday, January 26, 2009 Integrating Snort 3.0 (SnortSP) and Sguil in 3 Steps So once you have Snort 3.0 installed, what can you do with it? Backing up current local_rules.xml file. However, generating custom traffic to test the alert can sometimes be a challenge. 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. Find Age Regression Discord servers and make new friends! Started by Doug Burks, and first released in 2009, Security Onion has. ELSA? 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. 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. You received this message because you are subscribed to the Google Groups "security-onion" group. If you want to apply the threshold to a single node, place the pillar in /opt/so/saltstack/local/pillar/minions/.sls. Manager of Support and Professional Services. 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. If we want to allow a host or group of hosts to send syslog to a sensor, then we can do the following: In this example, we will be extending the default nginx port group to include port 8086 for a standalone node. 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. See above for suppress examples. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Security Onion a free and open platform for intrusion detection, enterprise security monitoring, and log management. 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. 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. The signature id (SID) must be unique. This directory stores the firewall rules specific to your grid. Copyright 2023 Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. When editing these files, please be very careful to respect YAML syntax, especially whitespace. 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). To get the best performance out of Security Onion, youll want to tune it for your environment. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Where is it that you cannot view them? These are the files that will need to be changed in order to customize nodes. https://docs.securityonion.net/en/2.3/local-rules.html?#id1. 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 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. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. I went ahead and put in the below rules under /etc/nsm/local.rules and ran the rule-update command. You may want to bump the SID into the 90,000,000 range and set the revision to 1. This directory contains the default firewall rules. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. 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). Identification. Have you tried something like this, in case you are not getting traffic to $HOME_NET? As shown above, we edit the minion pillar and add the SID to the idstools - sids - disabled section. 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. Adding local rules in Security Onion is a rather straightforward process. Tried as per your syntax, but still issue persists. /opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. 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. Security Onion has Snort built in and therefore runs in the same instance. 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. Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. =========================================================================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=========================================================================. Salt is a core component of Security Onion 2 as it manages all processes on all nodes. Minion pillar file: This is the minion specific pillar file that contains pillar definitions for that node. 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. Please update your bookmarks. Assuming you have Internet access, Security Onion will automatically update your NIDS rules on a daily basis. 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. 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. /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. When I run sostat. You signed in with another tab or window. 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. 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.
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