All alerts are viewable in Alerts, Dashboards, Hunt, and Kibana. Check your syslog-ng configuration for the name of the local log source ("src" is used on SUSE systems). (Alternatively, you can press Ctrl+Alt+T to open a new shell.) Started by Doug Burks, and first released in 2009, Security Onion has. Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. 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. However, generating custom traffic to test the alert can sometimes be a challenge. Salt can be used for data-driven orchestration, remote execution for any infrastructure, configuration management for any app stack, and much more. The county seat is in Evansville. There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). There are two directories that contain the yaml files for the firewall configuration. idstools may seem like it is ignoring your disabled rules request if you try to disable a rule that has flowbits set. To get the best performance out of Security Onion, youll want to tune it for your environment. There isnt much in here other than anywhere, dockernet, localhost and self. so-rule allows you to disable, enable, or modify NIDS rules. 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. 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. Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. 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. 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. In this file, the idstools section has a modify sub-section where you can add your modifications. 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. 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 Reboot into your new Security Onion installation and login using the username/password you specified in the previous step. Add the following to the sensor minion pillar file located at. . For example, if you had a web server you could include 80 and 443 tcp into an alias or in this case a port group. However, generating custom traffic to test the alert can sometimes be a challenge. The second only needs the $ character escaped to prevent bash from treating that as a variable. It is located at /opt/so/saltstack/local/pillar/global.sls. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you don't want your network sensors to process. 5. Please note! I've just updated the documentation to be clearer. The signature id (SID) must be unique. For some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. However, generating custom traffic to test the alert can sometimes be a challenge. 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. 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, 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. Security. Have you tried something like this, in case you are not getting traffic to $HOME_NET? This error now occurs in the log due to a change in the exception handling within Salts event module. 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. 2. /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. 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 ->. This is located at /opt/so/saltstack/local/pillar/minions/.sls. . 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. Inside of /opt/so/saltstack/local/salt/strelka/rules/localrules, add your YARA rules. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. I went ahead and put in the below rules under /etc/nsm/local.rules and ran the rule-update command. Here are some of the items that can be customized with pillar settings: Currently, the salt-minion service startup is delayed by 30 seconds. There are many ways to achieve age regression, but the three primary methods are: Botox. 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 . A tag already exists with the provided branch name. Port groups are a way of grouping together ports similar to a firewall port/service alias. Answered by weslambert on Dec 15, 2021. In 2008, Doug Burks started working on Security Onion, a Linux distribution for intrusion detection, network security monitoring, and log management. For example, suppose we want to disable SID 2100498. Revision 39f7be52. You signed in with another tab or window. 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. 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. From the Command Line. 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. 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. For example, if you dont care that users are accessing Facebook, then you can silence the policy-based signatures for Facebook access. 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. Adding local rules in Security Onion is a rather straightforward process. If you right click on the, You can learn more about snort and writing snort signatures from the. Interested in discussing how our products and services can help your organization? If you are on a large network, you may need to do additional tuning like pinning processes to CPU cores. 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 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. This section will cover both network firewalls outside of Security Onion and the host-based firewall built into Security Onion. Are you sure you want to create this branch? Open /etc/nsm/rules/local.rules using your favorite text editor. 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 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. Use one of the following examples in your console/terminal window: sudo nano local.rules sudo vim local.rules. Security Onion is a free and open source platform for threat hunting, network security monitoring, and log management. This way, you still have the basic ruleset, but the situations in which they fire are altered. If you want to apply the threshold to a single node, place the pillar in /opt/so/saltstack/local/pillar/minions/.sls. Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. 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. Security Onion offers the following choices for rulesets to be used by Suricata. . However, the exception is now logged. Some node types get their IP assigned to multiple host groups. 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. Add the following to the minions sls file located at. 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. idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. Write your rule, see Rules Format and save it. Minion pillar file: This is the minion specific pillar file that contains pillar definitions for that node. jq; so-allow; so-elastic-auth; so . 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. When editing these files, please be very careful to respect YAML syntax, especially whitespace. You may want to bump the SID into the 90,000,000 range and set the revision to 1. Escalate local privileges to root level. 1. Set anywhere from 5 to 12 in the local_rules Kevin. 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. . Generate some traffic to trigger the alert. All node types are added to the minion host group to allow Salt communication. In a distributed deployment, the manager node controls all other nodes via salt. When I run sostat. Modifying these values outside of so-allow or so-firewall could lead to problems accessing your existing hosts. /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. Once logs are generated by network sniffing processes or endpoints, where do they go? Do you see these alerts in Squert or ELSA? Start creating a file for your rule. Now that the configuration is in place, you can either wait for the sensor to sync with Salt running on the manager, or you can force it to update its firewall by running the following from the manager: Add the required ports to the port group. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. 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 signed in with another tab or window. The territories controlled by the ROC consist of 168 islands, with a combined area of 36,193 square . Open /etc/nsm/rules/local.rules using your favorite text editor. Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. 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
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