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. This is located at /opt/so/saltstack/local/pillar/minions/.sls. 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. The signature id (SID) must be unique. Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. Custom rules can be added to the local.rules file Rule threshold entries can . From the Command Line. Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. Open /etc/nsm/rules/local.rules using your favorite text editor. 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. 7.2. You signed in with another tab or window. However, generating custom traffic to test the alert can sometimes be a challenge. Reboot into your new Security Onion installation and login using the username/password you specified in the previous step. Integrated into the Security Onion, OSSEC is a host-based intrusion detection system (HIDS) that can conduct file integrity monitoring, local log monitoring, system process monitoring, and rootkit detection. Please keep this value below 90 seconds otherwise systemd will reach timeout and terminate the service. Salt sls files are in YAML format. Youll need to ensure the first of the two properly escapes any characters that would be interpreted by regex. Was this translation helpful? At those times, it can be useful to query the database from the commandline. 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. 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 If you pivot from that alert to the corresponding pcap you can verify the payload we sent. Diagnostic logs can be found in /opt/so/log/salt/. 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. Generate some traffic to trigger the alert. . 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. According to NIST, which step in the digital forensics process involves drawing conclusions from data? /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. This way, you still have the basic ruleset, but the situations in which they fire are altered. /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. Before You Begin. You need to configure Security Onion to send syslog so that InsightIDR can ingest it. Download Security Onion 20110116. 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. Beta 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? 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. Cleaning up local_rules.xml backup files older than 30 days. By default, only the analyst hostgroup is allowed access to the nginx ports. 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 rule-update (this will merge local.rules into downloaded.rules, update. 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). 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. If you right click on the, You can learn more about snort and writing snort signatures from the. Generate some traffic to trigger the alert. Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. You may want to bump the SID into the 90,000,000 range and set the revision to 1. Security Onion a free and open platform for intrusion detection, enterprise security monitoring, and log management. Long-term you should only run the rules necessary for > your environment. Interested in discussing how our products and services can help your organization? Run so-rule without any options to see the help output: We can use so-rule to modify an existing NIDS rule. Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: Paste the rule. 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. 2. You can add Wazuh HIDS rules in /opt/so/rules/hids/local_rules.xml. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. 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. Any line beginning with "#" can be ignored as it is a comment. Once your rules and alerts are under control, then check to see if you have packet loss. /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml defines custom port groups. And when I check, there are no rules there. How are they stored? 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. /opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. Port groups are a way of grouping together ports similar to a firewall port/service alias. 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). It is located at /opt/so/saltstack/local/pillar/global.sls. You should only run the rules necessary for your environment, so you may want to disable entire categories of rules that dont apply to you. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. 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. Any pointers would be appreciated. For some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. The easiest way to test that our NIDS is working as expected might be to simply access http://testmynids.org/uid/index.html from a machine that is being monitored by Security Onion. 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. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. The second only needs the $ character escaped to prevent bash from treating that as a variable. You can learn more about snort and writing snort signatures from the Snort Manual. Revision 39f7be52. The error can be ignored as it is not an indication of any issue with the minions. These non-manager nodes are referred to as salt minions. 41 - Network Segmentation, VLANs, and Subnets. Ingest. 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. 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. 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. Please provide the output of sostat-redacted, attaching as a plain text file, or by using a service like Pastebin.com. 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. 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). We created and maintain Security Onion, so we know it better than anybody else. > > > > > > > > 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. 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. Write your rule, see Rules Format and save it. 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. Open /etc/nsm/rules/local.rules using your favorite text editor. =========================================================================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=========================================================================. Have you tried something like this, in case you are not getting traffic to $HOME_NET? 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. This section will cover both network firewalls outside of Security Onion and the host-based firewall built into Security Onion. 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 and dont forget that the end is a semicolon and not a colon. Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. If you were to add a search node, you would see its IP appear in both the minion and the search_node host groups. If you built the rule correctly, then snort should be back up and running. We offer both training and support for Security Onion. Security Onion is a free and open-source Linux distribution prepared for intrusion detection, security monitoring, and log management with the assistance of security tools namely Snort,. 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. How are they parsed? This wiki is no longer maintained. Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. Start creating a file for your rule. Local pillar file: This is the pillar file under /opt/so/saltstack/local/pillar/. There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). In a distributed deployment, the manager node controls all other nodes via salt. "; 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). alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). There isnt much in here other than anywhere, dockernet, localhost and self. MISP Rules. Of course, the target IP address will most likely be different in your environment: destination d_tcp { tcp("192.168.3.136" port(514)); }; log { Escalate local privileges to root level. 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 Now that we have a signature that will generate alerts a little more selectively, we need to disable the original signature. If you would like to create a rule yourself and use it with Suricata, this guide might be helpful. . This is an advanced case and you most likely wont never need to modify these files. All node types are added to the minion host group to allow Salt communication. Boot the ISO and run through the installer. 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! Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. https://docs.securityonion.net/en/2.3/local-rules.html?#id1. For example, consider the following rules that reference the ET.MSSQL flowbit. Default pillar file: This is the pillar file located under /opt/so/saltstack/default/pillar/. 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? When you purchase products and services from us, you're helping to fund development of Security Onion! In syslog-ng, the following configuration forwards all local logs to Security Onion. As shown above, we edit the minion pillar and add the SID to the idstools - sids - disabled section. > To unsubscribe from this topic . The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. To get the best performance out of Security Onion, youll want to tune it for your environment. In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. You signed in with another tab or window. 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. Logs . Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. More information on each of these topics can be found in this section. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. 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. Security Onion is an open-source and free Linux distribution for log management, enterprise security monitoring, and intrusion detection. Revision 39f7be52. Revision 39f7be52. If so, then tune the number of AF-PACKET workers for sniffing processes. 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. Add the following to the sensor minion pillar file located at. jq; so-allow; so-elastic-auth; so . 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. 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. When I run sostat. For example, suppose we want to disable SID 2100498. (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. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you dont want your network sensors to process. Once logs are generated by network sniffing processes or endpoints, where do they go? The territories controlled by the ROC consist of 168 islands, with a combined area of 36,193 square . Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Minion pillar file: This is the minion specific pillar file that contains pillar definitions for that node. I've just updated the documentation to be clearer. Any definitions made here will override anything defined in other pillar files, including global. See above for suppress examples. 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. 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, Copyright 2023 3. You can learn more about scapy at secdev.org and itgeekchronicles.co.uk. To configure syslog for Security Onion: Stop the Security Onion service. (Alternatively, you can press Ctrl+Alt+T to open a new shell.) Check out our NIDS tuning video at https://youtu.be/1jEkFIEUCuI! In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. 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. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. If this is a distributed deployment, edit local.rules on your master server and it will replicate to your sensors. 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). 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. All alerts are viewable in Alerts, Dashboards, Hunt, and Kibana. Security Onion is a platform that allows you to monitor your network for security alerts. However, generating custom traffic to test the alert can sometimes be a challenge. The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. After viewing your redacted sostat it seems that the ICMP and UDP rules are triggering: Are you using SO with in a VM? https://securityonion.net/docs/AddingLocalRules. To unsubscribe from this group and stop receiving emails from it, send an email to security-onio.@googlegroups.com. 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 . Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.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. You received this message because you are subscribed to the Google Groups "security-onion" group. 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. . Adding local rules in Security Onion is a rather straightforward process. You can read more about this at https://redmine.openinfosecfoundation.org/issues/4377. Salt sls files are in YAML format. Copyright 2023 Backing up current downloaded.rules file before it gets overwritten. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. In a distributed deployment, the manager node controls all other nodes via salt. Finally, run so-strelka-restart to allow Strelka to pull in the new rules. 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. 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. 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 Modifying these values outside of so-allow or so-firewall could lead to problems accessing your existing hosts. From https://docs.saltstack.com/en/latest/: Salt is a core component of Security Onion 2 as it manages all processes on all nodes. Please update your bookmarks. Enter the following sample in a line at a time. 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 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. epic charting system training 1. Tried as per your syntax, but still issue persists. /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. Assuming you have Internet access, Security Onion will automatically update your NIDS rules on a daily basis. 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. One thing you can do with it (and the one that most people are interested in) is to configure it for IDS mode. This first sub-section will discuss network firewalls outside of Security Onion. c96 extractor. If you are on a large network, you may need to do additional tuning like pinning processes to CPU cores. 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 security-onion When I run 'rule-update' it give an error that there are no rules in /usr/local/lib/snort_dynamicrules. Introduction Adding local rules in Security Onion is a rather straightforward process. Adding Your Own Rules . Saltstack states are used to ensure the state of objects on a minion. 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. Full Name. The server is also responsible for ruleset management. 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 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. Salt is a core component of Security Onion 2 as it manages all processes on all nodes. You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. The remainder of this section will cover the host firewall built into Security Onion. For more information, please see https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. When configuring network firewalls for distributed deployments, youll want to ensure that nodes can connect as shown below. IPS Policy Security Onion has Snort built in and therefore runs in the same instance. For more information, please see: # alert ip any any -> any any (msg:"GPL ATTACK_RESPONSE id check returned root"; content:"uid=0|28|root|29|"; classtype:bad-unknown; sid:2100498; rev:7; metadata:created_at 2010_09_23, updated_at 2010_09_23;), /opt/so/saltstack/local/pillar/minions/_.sls, "GPL ATTACK_RESPONSE id check returned root test", /opt/so/saltstack/default/pillar/thresholding/pillar.usage, /opt/so/saltstack/default/pillar/thresholding/pillar.example, /opt/so/saltstack/local/pillar/global.sls, /opt/so/saltstack/local/pillar/minions/.sls, https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html, https://redmine.openinfosecfoundation.org/issues/4377, https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html.