How are they parsed? Minion pillar file: This is the minion specific pillar file that contains pillar definitions for that node. Age Regression SuppliesWelcome Welcome to Gabby's Little Store! This is From the Command Line. If you need to increase this delay, it can be done using the salt:minion:service_start_delay pillar. . These policy types can be found in /etc/nsm/rules/downloaded.rules. 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. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. Finally, run so-strelka-restart to allow Strelka to pull in the new rules. If you have multiple entries for the same SID, it will cause an error in salt resulting in all of the nodes in your grid to error out when checking in. Some node types get their IP assigned to multiple host groups. As shown above, we edit the minion pillar and add the SID to the idstools - sids - disabled section. Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. 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. Default YARA rules are provided from Florian Roths signature-base Github repo at https://github.com/Neo23x0/signature-base. 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 Security Onion Documentation Security Onion 2.3 documentation Security Onion generates a lot of valuable information for you the second you plug it into a TAP or SPAN port. If it is, then the most expedient measure may be to resolve the misconfiguration and then reinvestigate tuning. Use one of the following examples in your console/terminal window: sudo nano local.rules sudo vim local.rules. 2GB RAM will provide decent performance for the Sguil client and retrieving packet captures from the server but also enough to run Security Onion in standalone mode for monitoring the local client and testing packet captures with tools like tcpreplay, 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. This is an advanced case and you most likely wont never need to modify these files. 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've been teaching Security Onion classes and providing Professional Services since 2014. Security Onion. Firewall Security Onion 2.3 documentation 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. 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. When you purchase products and services from us, you're helping to fund development of Security Onion! For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. 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. More information on each of these topics can be found in this section. Integrating Snort 3.0 (SnortSP) and Sguil in 3 Steps - Security Onion Before You Begin. Security Onion Layers Ubuntu based OS Snort, Suricata Snorby Bro Sguil Squert Next, run so-yara-update to pull down the rules. Important "Security Onion" Files and Directories - Medium However, generating custom traffic to test the alert can sometimes be a challenge. Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: If you were to add a search node, you would see its IP appear in both the minion and the search_node host groups. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. 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 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. Salt can be used for data-driven orchestration, remote execution for any infrastructure, configuration management for any app stack, and much more. https://docs.securityonion.net/en/2.3/local-rules.html?#id1. Beta Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. If you would like to pull in NIDS rules from a MISP instance, please see the MISP Rules section. . Then tune your IDS rulesets. Global pillar file: This is the pillar file that can be used to make global pillar assignments to the nodes. 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. 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 . To verify the Snort version, type in snort -Vand hit Enter. Logs Security Onion 2.3 documentation Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. Any pointers would be appreciated. See above for suppress examples. 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). FAQ Security-Onion-Solutions/security-onion Wiki GitHub > > => I do not know how to do your guilde line. 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. Tried as per your syntax, but still issue persists. Syslog-ng and Security Onion 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. Security Onion: An Interesting Guide For 2021 - Jigsaw Academy 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. Started by Doug Burks, and first released in 2009, Security Onion has. (Alternatively, you can press Ctrl+Alt+T to open a new shell.) On Thursday, June 15, 2017 at 5:06:51 PM UTC+5:30, Wes wrote: Is it simply not triggering, or causing an error? 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. Identification. Please note that Suricata 6 has a 64-character limitation on the IP field in a threshold. Run the following command to get a listing of categories and the number of rules in each: In tuning your sensor, you must first understand whether or not taking corrective actions on this signature will lower your overall security stance. Security Onion Lab Setup with VirtualBox | Free Video Tutorial - Udemy Copyright 2023 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 lawson cedars. > To unsubscribe from this topic . This way, you still have the basic ruleset, but the situations in which they fire are altered. In a distributed deployment, the manager node controls all other nodes via salt.