In a distributed deployment, the manager node controls all other nodes via salt. . Youll need to ensure the first of the two properly escapes any characters that would be interpreted by regex. Please keep this value below 90 seconds otherwise systemd will reach timeout and terminate the service. According to NIST, which step in the digital forensics process involves drawing conclusions from data? 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. These are the files that will need to be changed in order to customize nodes. Previously, in the case of an exception, the code would just pass. 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. https://docs.securityonion.net/en/2.3/local-rules.html?#id1. Security Onion is a free and open source platform for threat hunting, network security monitoring, and log management. 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. See above for suppress examples. Full Name. And when I check, there are no rules there. Salt is a core component of Security Onion 2 as it manages all processes on all nodes. Please provide the output of sostat-redacted, attaching as a plain text file, or by using a service like Pastebin.com. If you pivot from that alert to the corresponding pcap you can verify the payload we sent. To unsubscribe from this group and stop receiving emails from it, send an email to security-onio.@googlegroups.com. Data collection Examination 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. Local pillar file: This is the pillar file under /opt/so/saltstack/local/pillar/. Run rule-update (this will merge local.rules into downloaded.rules, update. If this is a distributed deployment, edit local.rules on your master server and it will replicate to your sensors. 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. All the following will need to be run from the manager. 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 In a distributed deployment, the manager node controls all other nodes via salt. (Alternatively, you can press Ctrl+Alt+T to open a new shell.) 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 ->. Manager of Support and Professional Services. In many of the use cases below, we are providing the ability to modify a configuration file by editing either the global or minion pillar file. Now that we have a signature that will generate alerts a little more selectively, we need to disable the original signature. Add the following to the sensor minion pillar file located at. At those times, it can be useful to query the database from the commandline. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. Check out our NIDS tuning video at https://youtu.be/1jEkFIEUCuI! However, generating custom traffic to test the alert can sometimes be a challenge. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. Boot the ISO and run through the installer. 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, Logs. 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. /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. Any definitions made here will override anything defined in other pillar files, including global. 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. c96 extractor. Custom rules can be added to the local.rules file Rule threshold entries can . After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. 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 section will cover both network firewalls outside of Security Onion and the host-based firewall built into Security Onion. Double-click the Setup script on the Desktop and follow the prompts to configure and start the Sguil processes. Revision 39f7be52. 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 dont care that users are accessing Facebook, then you can silence the policy-based signatures for Facebook access. 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. If you want to tune Wazuh HIDS alerts, please see the Wazuh section. Where is it that you cannot view them? In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. To configure syslog for Security Onion: Stop the Security Onion service. 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). When editing these files, please be very careful to respect YAML syntax, especially whitespace. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. 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. Interested in discussing how our products and services can help your organization? 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. 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 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. 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. 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. There are many ways to achieve age regression, but the three primary methods are: Botox. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. You may want to bump the SID into the 90,000,000 range and set the revision to 1. If you would like to pull in NIDS rules from a MISP instance, please see: Once logs are generated by network sniffing processes or endpoints, where do they go? 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. For a Security Onion client, you should dedicate at least 2GB RAM, but ideally 4GB if possible. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. Security Onion uses idstools to download new signatures every night and process them against a set list of user generated configurations. 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. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you dont want your network sensors to process. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. . 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. On Thursday, June 15, 2017 at 5:06:51 PM UTC+5:30, Wes wrote: Is it simply not triggering, or causing an error? Try checking /var/log/nsm/hostname-interface/snortu-1.log for clues and please post the exact rule syntax you are attempting to use. (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. Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. 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. 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. Started by Doug Burks, and first released in 2009, Security Onion has. There are two directories that contain the yaml files for the firewall configuration. 1. The error can be ignored as it is not an indication of any issue with the minions. Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. 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. 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. Hi @Trash-P4nda , I've just updated the documentation to be clearer. 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 41 - Network Segmentation, VLANs, and Subnets. Revision 39f7be52. 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. 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. 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 default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. 3. To unsubscribe from this group and stop receiving emails from it, send an email to. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. and dont forget that the end is a semicolon and not a colon. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. I went ahead and put in the below rules under /etc/nsm/local.rules and ran the rule-update command. Any pointers would be appreciated. Revision 39f7be52. Here are some of the items that can be customized with pillar settings: Currently, the salt-minion service startup is delayed by 30 seconds. From https://docs.saltstack.com/en/latest/: Salt is a core component of Security Onion 2 as it manages all processes on all nodes. As shown above, we edit the minion pillar and add the SID to the idstools - sids - disabled section. Let's add a simple rule that will alert on the detection of a string in a tcp session. 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. epic charting system training It is now read-only. 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. If you would like to create a rule yourself and use it with Suricata, this guide might be helpful. This first sub-section will discuss network firewalls outside of Security Onion. You can read more about this at https://redmine.openinfosecfoundation.org/issues/4377. 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 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. Files here should not be modified as changes would be lost during a code update. 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,. 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. 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. Ingest. Download Security Onion 20110116. Salt is a new approach to infrastructure management built on a dynamic communication bus. If so, then tune the number of AF-PACKET workers for sniffing processes. Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. Copyright 2023 Port groups are a way of grouping together ports similar to a firewall port/service alias. It . To add local YARA rules, create a directory in /opt/so/saltstack/local/salt/strelka/rules, for example localrules. 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. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. It incorporates NetworkMiner, CyberChef, Squert, Sguil, Wazuh, Bro, Suricata, Snort, Kibana, Logstash, Elasticsearch, and numerous other security onion tools. 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. Revision 39f7be52. Then tune your IDS rulesets. 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. 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. When you run so-allow or so-firewall, it modifies this file to include the IP provided in the proper hostgroup. 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. 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. 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. Set anywhere from 5 to 12 in the local_rules Kevin. Firewall Requirements Salt minions must be able to connect to the manager node on ports 4505/tcp and 4506/tcp: Finally, run so-strelka-restart to allow Strelka to pull in the new 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: alert tcp any any -> $HOME_NET 7789 (msg: "Vote for Security Onion Toolsmith Tool of 2011! Logs . 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. To verify the Snort version, type in snort -Vand hit Enter. Give feedback. 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. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Copyright 2023 Tracking. You could try testing a rule . Security Onion is a intrusion detection and network monitoring tool. Diagnostic logs can be found in /opt/so/log/salt/. 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. All alerts are viewable in Alerts, Dashboards, Hunt, and Kibana. Global pillar file: This is the pillar file that can be used to make global pillar assignments to the nodes. Edit the /opt/so/rules/nids/local.rules file using vi or your favorite text editor: Paste the rule. However, the exception is now logged. IPS Policy I've just updated the documentation to be clearer. Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. Security Onion is an open-source and free Linux distribution for log management, enterprise security monitoring, and intrusion detection. Naming convention: The collection of server processes has a server name separate from the hostname of the box. > To unsubscribe from this topic . Salt sls files are in YAML format. 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. > > > > > > > > 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. For more information about Salt, please see https://docs.saltstack.com/en/latest/. Adding local rules in Security Onion is a rather straightforward process. 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. 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 Security. /opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. 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). Copyright 2023 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 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? Security Onion. It is located at /opt/so/saltstack/local/pillar/global.sls. idstools may seem like it is ignoring your disabled rules request if you try to disable a rule that has flowbits set. MISP Rules. Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. 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. Open /etc/nsm/rules/local.rules using your favorite text editor. If you want to apply the threshold to a single node, place the pillar in /opt/so/saltstack/local/pillar/minions/.sls. . Next, run so-yara-update to pull down the rules. After select all interfaces also ICMP logs not showing in sguil. There isnt much in here other than anywhere, dockernet, localhost and self. Generate some traffic to trigger the alert. For example, consider the following rules that reference the ET.MSSQL flowbit. 3. 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 Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. These non-manager nodes are referred to as salt minions. In the image below, we can see how we define some rules for an eval node. You signed in with another tab or window. Security Onion is a platform that allows you to monitor your network for security alerts. Copyright 2023 alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). Before You Begin. The second only needs the $ character escaped to prevent bash from treating that as a variable. Backing up current downloaded.rules file before it gets overwritten. We've been teaching Security Onion classes and providing Professional Services since 2014. 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. 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. idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. https://securityonion.net/docs/AddingLocalRules. One thing you can do with it (and the one that most people are interested in) is to configure it for IDS mode. 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. ELSA? /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. 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. The National Institutes of Standards and Technology (NIST) 800-171 cybersecurity standard has four safeguards that are related to network traffic monitoring: 3.13.1: Monitor, control, and protect organizational communications (i.e., information transmitted or received by organizational information =========================================================================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=========================================================================. /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml defines custom port groups. All node types are added to the minion host group to allow Salt communication. 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 How are they parsed? . We created and maintain Security Onion, so we know it better than anybody else. Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. More information on each of these topics can be found in this section.