For more information, please see https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. With this functionality we can suppress rules based on their signature, the source or destination address and even the IP or full CIDR network block. If you pivot from that alert to the corresponding pcap you can verify the payload we sent. 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. 41 - Network Segmentation, VLANs, and Subnets. Naming convention: The collection of server processes has a server name separate from the hostname of the box. In the image below, we can see how we define some rules for an eval node. 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 ->. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. When editing these files, please be very careful to respect YAML syntax, especially whitespace. 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. In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. Security Onion is an open-source and free Linux distribution for log management, enterprise security monitoring, and intrusion detection. If you want to apply the threshold to a single node, place the pillar in /opt/so/saltstack/local/pillar/minions/.sls. lawson cedars. Next, run so-yara-update to pull down the rules. Local pillar file: This is the pillar file under /opt/so/saltstack/local/pillar/. Adding local rules in Security Onion is a rather straightforward process. If you would like to pull in NIDS rules from a MISP instance, please see: 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. To verify the Snort version, type in snort -Vand hit Enter. Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: Paste the rule. 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. Revision 39f7be52. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. 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. 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. Custom rules can be added to the local.rules file Rule threshold entries can . Are you sure you want to create this branch? For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. We offer both training and support for Security Onion. 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). Open /etc/nsm/rules/local.rules using your favorite text editor. Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. Revision 39f7be52. Use one of the following examples in your console/terminal window: sudo nano local.rules sudo vim local.rules. 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. 3. Revision 39f7be52. Copyright 2023 Security Onion is a intrusion detection and network monitoring tool. > To unsubscribe from this topic . Tried as per your syntax, but still issue persists. 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. When I run sostat. If you are on a large network, you may need to do additional tuning like pinning processes to CPU cores. Copyright 2023 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/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. Also ensure you run rule-update on the machine. . Identification. As you can see I have the Security Onion machine connected within the internal network to a hub. And when I check, there are no rules there. You signed in with another tab or window. Any definitions made here will override anything defined in other pillar files, including global. 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. /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml defines custom port groups. If there are a large number of uncategorized events in the securityonion_db database, sguil can have a hard time of managing the vast amount of data it needs to process to present a comprehensive overview of the alerts. and dont forget that the end is a semicolon and not a colon. . See above for suppress examples. These policy types can be found in /etc/nsm/rules/downloaded.rules. 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 Do you see these alerts in Squert or ELSA? the rule is missing a little syntax, maybe try: alert icmp any any -> $HOME_NET any (msg:"ICMP Testing"; sid:1000001; rev:1;). Full Name. For example, if you dont care that users are accessing Facebook, then you can silence the policy-based signatures for Facebook access. Revision 39f7be52. 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. Modifying these values outside of so-allow or so-firewall could lead to problems accessing your existing hosts. 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. If you would like to pull in NIDS rules from a MISP instance, please see the MISP Rules section. 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. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. How are they stored? However, generating custom traffic to test the alert can sometimes be a challenge. Some node types get their IP assigned to multiple host groups. 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. Backing up current downloaded.rules file before it gets overwritten. You can do the reverse unit conversion from MPa to psi, or enter any two units below:LED MSI Optix G242 24 inch IPS Gaming Monitor - Full HD - 144Hz Refresh Rate - 1ms Response time - Adaptive Sync for Esports (9S6-3BA41T-039) LED MSI OPTIX G272 Gaming Monitor 27" FHD IPS 144HZ 1MS Adaptive Sync (9S6-3CB51T-036) LG 27 FHD IPS 1ms 240Hz G . If so, then tune the number of AF-PACKET workers for sniffing processes. Please note! Security Onion. 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 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. 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. Run so-rule without any options to see the help output: We can use so-rule to modify an existing NIDS rule. In a distributed deployment, the manager node controls all other nodes via salt. 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. Once your rules and alerts are under control, then check to see if you have packet loss. This repository has been archived by the owner on Apr 16, 2021. 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. . However, the exception is now logged. 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. Copyright 2023 On Thursday, June 15, 2017 at 5:06:51 PM UTC+5:30, Wes wrote: Is it simply not triggering, or causing an error? You could try testing a rule . https://docs.securityonion.net/en/2.3/local-rules.html?#id1. 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. 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. It incorporates NetworkMiner, CyberChef, Squert, Sguil, Wazuh, Bro, Suricata, Snort, Kibana, Logstash, Elasticsearch, and numerous other security onion tools. If you need to increase this delay, it can be done using the salt:minion:service_start_delay pillar. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you don't want your network sensors to process. Generate some traffic to trigger the alert. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. . Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. That's what we'll discuss in this section. I went ahead and put in the below rules under /etc/nsm/local.rules and ran the rule-update command. (Alternatively, you can press Ctrl+Alt+T to open a new shell.) 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. To add local YARA rules, create a directory in /opt/so/saltstack/local/salt/strelka/rules, for example localrules. so-rule allows you to disable, enable, or modify NIDS rules. 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,. 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 Security Onion Layers Ubuntu based OS Snort, Suricata Snorby Bro Sguil Squert 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. 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. Let's add a simple rule that will alert on the detection of a string in a tcp session. 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. A. Check your syslog-ng configuration for the name of the local log source ("src" is used on SUSE systems). 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 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. One thing you can do with it (and the one that most people are interested in) is to configure it for IDS mode. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. This error now occurs in the log due to a change in the exception handling within Salts event module. 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 Set anywhere from 5 to 12 in the local_rules Kevin. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. Security Onion offers the following choices for rulesets to be used by Suricata. 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. For a Security Onion client, you should dedicate at least 2GB RAM, but ideally 4GB if possible. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. PFA local.rules. Security Onion a free and open platform for intrusion detection, enterprise security monitoring, and log management. Security. These non-manager nodes are referred to as salt minions. MISP Rules. Security Onion generates a lot of valuable information for you the second you plug it into a TAP or SPAN port. Logs. The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. We created and maintain Security Onion, so we know it better than anybody else. 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. 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. 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. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Please provide the output of sostat-redacted, attaching as a plain text file, or by using a service like Pastebin.com. This wiki is no longer maintained. 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 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. 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. jq; so-allow; so-elastic-auth; so . As shown above, we edit the minion pillar and add the SID to the idstools - sids - disabled section. > > => I do not know how to do your guilde line. 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. Try checking /var/log/nsm/hostname-interface/snortu-1.log for clues and please post the exact rule syntax you are attempting to use. If . In syslog-ng, the following configuration forwards all local logs to 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. idstools may seem like it is ignoring your disabled rules request if you try to disable a rule that has flowbits set. All node types are added to the minion host group to allow Salt communication. Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: Saltstack states are used to ensure the state of objects on a minion. When editing these files, please be very careful to respect YAML syntax, especially whitespace. 1. 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? 4. It is located at /opt/so/saltstack/local/pillar/global.sls. Global pillar file: This is the pillar file that can be used to make global pillar assignments to the nodes. Please keep this value below 90 seconds otherwise systemd will reach timeout and terminate the service. You can find the latest version of this page at: https://securityonion.net/docs/AddingLocalRules. Salt is a core component of Security Onion 2 as it manages all processes on all nodes. 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 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. Revision 39f7be52. Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. If you built the rule correctly, then snort should be back up and running. 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. Beta /opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. Ingest. To unsubscribe from this group and stop receiving emails from it, send an email to security-onio.@googlegroups.com. Check out our NIDS tuning video at https://youtu.be/1jEkFIEUCuI! These are the files that will need to be changed in order to customize nodes. It's simple enough to run in small environments without many issues and allows advanced users to deploy distributed systems that can be used in network enterprise type environments. Logs . Salt sls files are in YAML format. 2. All the following will need to be run from the manager. Adding local rules in Security Onion is a rather straightforward process. However, generating custom traffic to test the alert can sometimes be a challenge. Revision 39f7be52. It is now read-only. This directory contains the default firewall rules. Interested in discussing how our products and services can help your organization? This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). (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. To get the best performance out of Security Onion, youll want to tune it for your environment. . Now that we have a signature that will generate alerts a little more selectively, we need to disable the original signature. /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. 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. 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. 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! This section will cover both network firewalls outside of Security Onion and the host-based firewall built into Security Onion. This is located at /opt/so/saltstack/local/pillar/minions/.sls. This directory stores the firewall rules specific to your grid. 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). /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 you run so-allow or so-firewall, it modifies this file to include the IP provided in the proper hostgroup. 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. You can read more about this at https://redmine.openinfosecfoundation.org/issues/4377. In a distributed deployment, the manager node controls all other nodes via salt. Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. When you purchase products and services from us, you're helping to fund development of Security Onion! Before You Begin. 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. 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. This is an advanced case and you most likely wont never need to modify these files. /opt/so/saltstack/local/salt/firewall/assigned_hostgroups.local.map.yaml is where host group and port group associations would be made to create custom host group and port group assignements that would apply to all nodes of a certain role type in the grid. Security Onion has Snort built in and therefore runs in the same instance. Security Onion is a free and open source platform for threat hunting, network security monitoring, and log management. The county seat is in Evansville. You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. The next run of idstools should then merge /opt/so/rules/nids/local.rules into /opt/so/rules/nids/all.rules which is what Suricata reads from. Finally, run so-strelka-restart to allow Strelka to pull in the new rules. =========================================================================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=========================================================================. Taiwan, officially the Republic of China (ROC), is a country in East Asia.It is located at the junction of the East and South China Seas in the northwestern Pacific Ocean, with the People's Republic of China (PRC) to the northwest, Japan to the northeast, and the Philippines to the south. 7.2. You signed in with another tab or window. 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. 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 Files here should not be modified as changes would be lost during a code update. Generate some traffic to trigger the alert. For some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. Cannot retrieve contributors at this time. Introduction Adding local rules in Security Onion is a rather straightforward process. to security-onion When I run 'rule-update' it give an error that there are no rules in /usr/local/lib/snort_dynamicrules. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. Here are some of the items that can be customized with pillar settings: Currently, the salt-minion service startup is delayed by 30 seconds. However, generating custom traffic to test the alert can sometimes be a challenge. IPS Policy You may want to bump the SID into the 90,000,000 range and set the revision to 1.