security onion local rules security onion local rules

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 To verify the Snort version, type in snort -Vand hit Enter. epic charting system training 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 . 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. 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. Let's add a simple rule that will alert on the detection of a string in a tcp session: Run rule-update (this will merge local.rules into downloaded.rules, update sid-msg.map, and restart processes as necessary): If you built the rule correctly, then Snort/Suricata should be back up and running. However, generating custom traffic to test the alert can sometimes be a challenge. 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 Logs . Add the following to the minions sls file located at. . in Sguil? If you built the rule correctly, then snort should be back up and running. 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. All node types are added to the minion host group to allow Salt communication. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. 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. https://docs.securityonion.net/en/2.3/local-rules.html?#id1. 1. Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. Security Onion uses idstools to download new signatures every night and process them against a set list of user generated configurations. Another consideration is whether or not the traffic is being generated by a misconfigured piece of equipment. A tag already exists with the provided branch name. 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 Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. You signed in with another tab or window. How are they stored? Naming convention: The collection of server processes has a server name separate from the hostname of the box. The second only needs the $ character escaped to prevent bash from treating that as a variable. c96 extractor. 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. 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. For example, suppose we want to disable SID 2100498. Next, run so-yara-update to pull down the rules. Copyright 2023 However, the exception is now logged. It is now read-only. That's what we'll discuss in this section. Copyright 2023 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. Any pointers would be appreciated. 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. 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. Check out our NIDS tuning video at https://youtu.be/1jEkFIEUCuI! More information on each of these topics can be found in this section. The territories controlled by the ROC consist of 168 islands, with a combined area of 36,193 square . Default pillar file: This is the pillar file located under /opt/so/saltstack/default/pillar/. Started by Doug Burks, and first released in 2009, Security Onion has. 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. If you want to tune Wazuh HIDS alerts, please see the Wazuh section. Adding local rules in Security Onion is a rather straightforward process. To add local YARA rules, create a directory in /opt/so/saltstack/local/salt/strelka/rules, for example localrules. 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. 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. The error can be ignored as it is not an indication of any issue with the minions. Diagnostic logs can be found in /opt/so/log/salt/. When editing these files, please be very careful to respect YAML syntax, especially whitespace. Manager of Support and Professional Services. Revision 39f7be52. Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. 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. Check your syslog-ng configuration for the name of the local log source ("src" is used on SUSE systems). 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. 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 ->. . Copyright 2023 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. You can learn more about snort and writing snort signatures from the Snort Manual. Please review the Salt section to understand pillars and templates. Finally, run so-strelka-restart to allow Strelka to pull in the new rules. How are they parsed? The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. Run so-rule without any options to see the help output: We can use so-rule to modify an existing NIDS rule. 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). Once your rules and alerts are under control, then check to see if you have packet loss. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. 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. Then tune your IDS rulesets. Tried as per your syntax, but still issue persists. At those times, it can be useful to query the database from the commandline. 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. Adding local rules in Security Onion is a rather straightforward process. 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. There are two directories that contain the yaml files for the firewall configuration. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. To get the best performance out of Security Onion, youll want to tune it for your environment. Generate some traffic to trigger the alert. 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. 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. lawson cedars. Run rule-update (this will merge local.rules into downloaded.rules, update. 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. If you would like to pull in NIDS rules from a MISP instance, please see the MISP Rules section. These non-manager nodes are referred to as salt 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. 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. 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. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. 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. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. 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. 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. 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). ELSA? /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml defines custom port groups. After viewing your redacted sostat it seems that the ICMP and UDP rules are triggering: Are you using SO with in a VM? 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. . Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. 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, 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. 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 { To configure syslog for Security Onion: Stop the Security Onion service. 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. > > => I do not know how to do your guilde line. Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: 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. Ingest. 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. 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. In syslog-ng, the following configuration forwards all local logs to Security Onion. If you pivot from that alert to the corresponding pcap you can verify the payload we sent. 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. Are you sure you want to create this branch? 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 writeup contains a listing of important Security Onion files and directories. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. There isnt much in here other than anywhere, dockernet, localhost and self. 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. 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. As shown above, we edit the minion pillar and add the SID to the idstools - sids - disabled section. the rule is missing a little syntax, maybe try: alert icmp any any -> $HOME_NET any (msg:"ICMP Testing"; sid:1000001; rev:1;). See above for suppress examples. In a distributed deployment, the manager node controls all other nodes via salt. These non-manager nodes are referred to as salt minions. This directory stores the firewall rules specific to your grid. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. 5. I went ahead and put in the below rules under /etc/nsm/local.rules and ran the rule-update command. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Youll need to ensure the first of the two properly escapes any characters that would be interpreted by regex. 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. Please keep this value below 90 seconds otherwise systemd will reach timeout and terminate the service. MISP Rules. Reboot into your new Security Onion installation and login using the username/password you specified in the previous step. You received this message because you are subscribed to the Google Groups "security-onion" group. When you run so-allow or so-firewall, it modifies this file to include the IP provided in the proper hostgroup. In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. Full Name. Was this translation helpful? Security Onion generates a lot of valuable information for you the second you plug it into a TAP or SPAN port. Enter the following sample in a line at a time. Saltstack states are used to ensure the state of objects on a minion. 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). Set anywhere from 5 to 12 in the local_rules Kevin. Revision 39f7be52. The durian (/ d r i n /, / dj r i n /) is the edible fruit of several tree species belonging to the genus Durio.There are 30 recognised Durio species, at least nine of which produce edible fruit. /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. For more information about Salt, please see https://docs.saltstack.com/en/latest/. Identification. Boot the ISO and run through the installer. (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? Security Onion has Snort built in and therefore runs in the same instance. 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. You signed in with another tab or window. A. We created and maintain Security Onion, so we know it better than anybody else. It . Security Onion Layers Ubuntu based OS Snort, Suricata Snorby Bro Sguil Squert 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. Open /etc/nsm/rules/local.rules using your favorite text editor. All alerts are viewable in Alerts, Dashboards, Hunt, and Kibana. Try checking /var/log/nsm/hostname-interface/snortu-1.log for clues and please post the exact rule syntax you are attempting to use. To unsubscribe from this group and stop receiving emails from it, send an email to security-onio.@googlegroups.com. . There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). 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. For example, if you dont care that users are accessing Facebook, then you can silence the policy-based signatures for Facebook access. Give feedback. These are the files that will need to be changed in order to customize nodes. Minion pillar file: This is the minion specific pillar file that contains pillar definitions for that node. Any line beginning with "#" can be ignored as it is a comment. Please update your bookmarks. . Local pillar file: This is the pillar file under /opt/so/saltstack/local/pillar/. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. For example, suppose that we want to modify SID 2100498 and replace any instances of returned root with returned root test. Assuming you have Internet access, Security Onion will automatically update your NIDS rules on a daily basis. /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. All the following will need to be run from the manager. Tracking. Add the following to the sensor minion pillar file located at. To unsubscribe from this group and stop receiving emails from it, send an email to. 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. In the image below, we can see how we define some rules for an eval node. 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. /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. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. 7.2. 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 Write your rule, see Rules Format and save it. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. 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. /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. As you can see I have the Security Onion machine connected within the internal network to a hub. Find Age Regression Discord servers and make new friends! For example, if you include a bad custom snort rule with incorrect syntax, the snort engine will fail . One thing you can do with it (and the one that most people are interested in) is to configure it for IDS mode. Security Onion offers the following choices for rulesets to be used by Suricata. Our products include both the Security Onion software and specialized hardware appliances that are built and tested to run Security Onion. 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. When I run sostat. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. If you need to increase this delay, it can be done using the salt:minion:service_start_delay pillar. The set of processes includes sguild, mysql, and optionally the Elastic stack (Elasticsearch, Logstash, Kibana) and Curator. 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 . > To unsubscribe from this topic . You signed in with another tab or window. Files here should not be modified as changes would be lost during a code update. 3. 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. I've just updated the documentation to be clearer. Any definitions made here will override anything defined in other pillar files, including global. 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). Answered by weslambert on Dec 15, 2021. You could try testing a rule . Download Security Onion 20110116. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. 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. Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. 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 According to NIST, which step in the digital forensics process involves drawing conclusions from data? 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. Security. Salt can be used for data-driven orchestration, remote execution for any infrastructure, configuration management for any app stack, and much more. 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. These policy types can be found in /etc/nsm/rules/downloaded.rules. You can learn more about scapy at secdev.org and itgeekchronicles.co.uk. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you don't want your network sensors to process. 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.