In a distributed deployment, the manager node controls all other nodes via salt. idstools may seem like it is ignoring your disabled rules request if you try to disable a rule that has flowbits set. 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. To configure syslog for Security Onion: Stop the Security Onion service. This writeup contains a listing of important Security Onion files and directories. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. This is located at /opt/so/saltstack/local/pillar/minions/.sls. In order to apply the threshold to all nodes, place the pillar in /opt/so/saltstack/local/pillar/global.sls. Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. We offer both training and support for Security Onion. These non-manager nodes are referred to as salt minions. 1. 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. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. For example, if you include a bad custom snort rule with incorrect syntax, the snort engine will fail . You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. 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. 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. Security Onion offers the following choices for rulesets to be used by Suricata. Minion pillar file: This is the minion specific pillar file that contains pillar definitions for that 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. . Run so-rule without any options to see the help output: We can use so-rule to modify an existing NIDS rule. 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. However, generating custom traffic to test the alert can sometimes be a challenge. 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 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 ->. Try checking /var/log/nsm/hostname-interface/snortu-1.log for clues and please post the exact rule syntax you are attempting to use. > > => I do not know how to do your guilde line. Revision 39f7be52. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. You can read more about this at https://redmine.openinfosecfoundation.org/issues/4377. PFA local.rules. 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). 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. 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. 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 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. . Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. . I went ahead and put in the below rules under /etc/nsm/local.rules and ran the rule-update command. Let's add a simple rule that will alert on the detection of a string in a tcp session. 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. ELSA? Data collection Examination Security Onion is an open-source and free Linux distribution for log management, enterprise security monitoring, and intrusion detection. 1. /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. However, the exception is now logged. Interested in discussing how our products and services can help your organization? jq; so-allow; so-elastic-auth; so . A node that has a port group and host group association assigned to it will allow those hosts to connect to those ports on that node. /opt/so/saltstack/local/pillar/minions/, https://www.proofpoint.com/us/threat-insight/et-pro-ruleset, https://www.snort.org/downloads/#rule-downloads, https://www.snort.org/faq/what-are-community-rules, https://snort.org/documents/registered-vs-subscriber, license fee per sensor (users are responsible for purchasing enough licenses for their entire deployment), Snort SO (Shared Object) rules only work with Snort not, same rules as Snort Subscriber ruleset, except rules only retrievable after 30 days past release, not officially managed/supported by Security Onion. Salt is a new approach to infrastructure management built on a dynamic communication bus. If this is a distributed deployment, edit local.rules on your master server and it will replicate to your sensors. Backing up current local_rules.xml file. That's what we'll discuss in this section. The county seat is in Evansville. The remainder of this section will cover the host firewall built into Security Onion. Please provide the output of sostat-redacted, attaching as a plain text file, or by using a service like Pastebin.com. 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 In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. Custom rules can be added to the local.rules file Rule threshold entries can . If so, then tune the number of AF-PACKET workers for sniffing processes. For example, suppose we want to disable SID 2100498. How are they stored? 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. . Also ensure you run rule-update on the machine. If you want to tune Wazuh HIDS alerts, please see the Wazuh section. Security Onion a free and open platform for intrusion detection, enterprise security monitoring, and log management. 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. Local pillar file: This is the pillar file under /opt/so/saltstack/local/pillar/. 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 . If you would like to pull in NIDS rules from a MISP instance, please see the MISP Rules section. 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). I've just updated the documentation to be clearer. This will add the host group to, Add the desired IPs to the host group. To get the best performance out of Security Onion, youll want to tune it for your environment. 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. When configuring network firewalls for distributed deployments, youll want to ensure that nodes can connect as shown below. Are you sure you want to create this branch? Can anyone tell me > > > > what I've done wrong please? Answered by weslambert on Dec 15, 2021. Tracking. (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. Finally, run so-strelka-restart to allow Strelka to pull in the new rules. 4. 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 . Add the following to the minions sls file located at. For a Security Onion client, you should dedicate at least 2GB RAM, but ideally 4GB if possible. 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. Long-term you should only run the rules necessary for > your environment. When I run sostat. If you need to increase this delay, it can be done using the salt:minion:service_start_delay pillar. If you pivot from that alert to the corresponding pcap you can verify the payload we sent. Security. 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. Where is it that you cannot view them? This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Revision 39f7be52. The error can be ignored as it is not an indication of any issue with the minions. 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. For more information, please see https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. Security Onion is a intrusion detection and network monitoring tool. Manager of Support and Professional Services. 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. For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. IPS Policy Next, run so-yara-update to pull down the rules. When you run so-allow or so-firewall, it modifies this file to include the IP provided in the proper hostgroup. Please note that Suricata 6 has a 64-character limitation on the IP field in a threshold. Use one of the following examples in your console/terminal window: sudo nano local.rules sudo vim local.rules. Assuming you have Internet access, Security Onion will automatically update your NIDS rules on a daily basis. . 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). If . By default, only the analyst hostgroup is allowed access to the nginx ports. This section will cover both network firewalls outside of Security Onion and the host-based firewall built into Security Onion. Inside of /opt/so/saltstack/local/salt/strelka/rules/localrules, add your YARA rules. 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. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. All the following will need to be run from the manager. The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: Open /etc/nsm/rules/local.rules using your favorite text editor. To unsubscribe from this group and stop receiving emails from it, send an email to security-onio.@googlegroups.com. 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. Check out our NIDS tuning video at https://youtu.be/1jEkFIEUCuI! Have you tried something like this, in case you are not getting traffic to $HOME_NET? 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). 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. 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. 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. In the image below, we can see how we define some rules for an eval node. epic charting system training 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. When editing these files, please be very careful to respect YAML syntax, especially whitespace. Salt can be used for data-driven orchestration, remote execution for any infrastructure, configuration management for any app stack, and much more. To verify the Snort version, type in snort -Vand hit Enter. 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. Our documentation has moved to https://securityonion.net/docs/. 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. 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. Revision 39f7be52. 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. 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. If it is, then the most expedient measure may be to resolve the misconfiguration and then reinvestigate tuning. 7.2. According to NIST, which step in the digital forensics process involves drawing conclusions from data? In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. When editing these files, please be very careful to respect YAML syntax, especially whitespace. As shown above, we edit the minion pillar and add the SID to the idstools - sids - disabled section. The signature id (SID) must be unique. and dont forget that the end is a semicolon and not a colon. alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). Ingest. Security Onion uses idstools to download new signatures every night and process them against a set list of user generated configurations. 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. > > > > > > > > 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. Before You Begin. Copyright 2023 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 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. Adding local rules in Security Onion is a rather straightforward process. 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. 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. On Thursday, June 15, 2017 at 5:06:51 PM UTC+5:30, Wes wrote: Is it simply not triggering, or causing an error? Logs . Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. You can learn more about snort and writing snort signatures from the Snort Manual. 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. 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. 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. This directory stores the firewall rules specific to your grid. Please note! Please update your bookmarks. 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 error now occurs in the log due to a change in the exception handling within Salts event module. In this file, the idstools section has a modify sub-section where you can add your modifications. /opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). Security Onion. 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. Reboot into your new Security Onion installation and login using the username/password you specified in the previous step. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. All node types are added to the minion host group to allow Salt communication. 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. You can find the latest version of this page at: https://securityonion.net/docs/AddingLocalRules. 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. Find Age Regression Discord servers and make new friends! Security Onion offers the following choices for rulesets to be used by Snort/Suricata: 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 . 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. 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. 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. Generate some traffic to trigger the alert. This is an advanced case and you most likely wont never need to modify these files. You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. 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 Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. Salt sls files are in YAML format. Open /etc/nsm/rules/local.rules using your favorite text editor. 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. In 2008, Doug Burks started working on Security Onion, a Linux distribution for intrusion detection, network security monitoring, and log management. All alerts are viewable in Alerts, Dashboards, Hunt, and Kibana. Our products include both the Security Onion software and specialized hardware appliances that are built and tested to run Security Onion. There are two directories that contain the yaml files for the firewall configuration. Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. In syslog-ng, the following configuration forwards all local logs to Security Onion. You could try testing a rule . This way, you still have the basic ruleset, but the situations in which they fire are altered. We created and maintain Security Onion, so we know it better than anybody else. 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. Revision 39f7be52. 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. Escalate local privileges to root level. Security Onion has Snort built in and therefore runs in the same instance. Copyright 2023 If you would like to create a rule yourself and use it with Suricata, this guide might be helpful. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. 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 so-rule allows you to disable, enable, or modify NIDS rules. the rule is missing a little syntax, maybe try: alert icmp any any -> $HOME_NET any (msg:"ICMP Testing"; sid:1000001; rev:1;). 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. 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. 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. 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 Diagnostic logs can be found in /opt/so/log/salt/. in Sguil? For example, consider the following rules that reference the ET.MSSQL flowbit. 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. Give feedback. However, generating custom traffic to test the alert can sometimes be a challenge. MISP Rules. idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. 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. Salt is a core component of Security Onion 2 as it manages all processes on all nodes. /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml defines custom port groups. Global pillar file: This is the pillar file that can be used to make global pillar assignments to the nodes. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. If you right click on the, You can learn more about snort and writing snort signatures from the. Here are some of the items that can be customized with pillar settings: Currently, the salt-minion service startup is delayed by 30 seconds. It incorporates NetworkMiner, CyberChef, Squert, Sguil, Wazuh, Bro, Suricata, Snort, Kibana, Logstash, Elasticsearch, and numerous other security onion tools. It is now read-only. If you are on a large network, you may need to do additional tuning like pinning processes to CPU cores. If you cant run so-rule, you can modify the configuration manually in the manager pillar file at /opt/so/saltstack/local/pillar/minions/_.sls (where is manager, managersearch, standalone, or eval depending on the manager type that was chosen during install). Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. Copyright 2023 Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. This directory contains the default firewall rules. To add local YARA rules, create a directory in /opt/so/saltstack/local/salt/strelka/rules, for example localrules. Copyright 2023 /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.
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