Security Onion is an open-source and free Linux distribution for log management, enterprise security monitoring, and intrusion detection. 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, 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. Run so-rule without any options to see the help output: We can use so-rule to modify an existing NIDS rule. Start creating a file for your rule. Security. 5. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. Data collection Examination We created and maintain Security Onion, so we know it better than anybody else. 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. Security Onion not detecting traffic - groups.google.com Revision 39f7be52. A. Tried as per your syntax, but still issue persists. However, the exception is now logged. jq; so-allow; so-elastic-auth; so . If you pivot from that alert to the corresponding pcap you can verify the payload we sent. we run SO in a distributed deployment and the manager doesn't run strelka but does run on the sensor, the paths however (/opt/so/saltstack/local/salt/strelka/rules) exist on the manger but not the sensor, I did find the default repo under opt/so/saltstack/default/salt/strelka/rules/ on the manager and I can run so-yara-update but not so-strelka-restart because its not running on the manager so I'm a little confused on where I should be putting the custom YARA rules because things don't line up with the documentation or I'm just getting super confused. These policy types can be found in /etc/nsm/rules/downloaded.rules. 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. 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. However, generating custom traffic to test the alert can sometimes be a challenge. Please note! Logs Security Onion 2.3 documentation 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. Copyright 2023 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). Cannot retrieve contributors at this time. 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. 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. Long-term you should only run the rules necessary for > your environment. Now that we have a signature that will generate alerts a little more selectively, we need to disable the original signature. If you would like to pull in NIDS rules from a MISP instance, please see the MISP Rules section. Generate some traffic to trigger the alert. Once logs are generated by network sniffing processes or endpoints, where do they go? 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. Syslog-ng and Security Onion 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. 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. This way, you still have the basic ruleset, but the situations in which they fire are altered. c96 extractor. You could try testing a rule . Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. 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). Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. Identification. Security Onion. Host groups are similar to port groups but for storing lists of hosts that will be allowed to connect to the associated port groups. If so, then tune the number of AF-PACKET workers for sniffing processes. 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. epic charting system training Tuning NIDS Rules in Security Onion - YouTube In this file, the idstools section has a modify sub-section where you can add your modifications. All the following will need to be run from the manager. 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. 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. Introduction to Sguil and Squert: Part 1 - Security Onion Open /etc/nsm/rules/local.rules using your favorite text editor. 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. You signed in with another tab or window. Apply the firewall state to the node, or wait for the highstate to run for the changes to happen automatically. 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. More information on each of these topics can be found in this section. 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 { 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 Logs . When configuring network firewalls for Internet-connected deployments (non-Airgap), youll want to ensure that the deployment can connect outbound to the following: In the case of a distributed deployment, you can configure your nodes to pull everything from the manager so that only the manager requires Internet access. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once. Security Onion: A Linux Distro For IDS, NSM, And Log Management | Unixmen 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 . 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 Solutions No rules in /usr/local/lib/snort_dynamicrules - Google Groups Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you dont want your network sensors to process. When configuring network firewalls for distributed deployments, youll want to ensure that nodes can connect as shown below. Salt minions must be able to connect to the manager node on ports, /opt/so/saltstack/local/pillar/global.sls, /opt/so/saltstack/local/pillar/minions/.sls, https://docs.saltproject.io/en/getstarted/system/communication.html, https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. 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. Adding Your Own Rules . . Age Regression SuppliesWelcome Welcome to Gabby's Little Store! This is 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. Next, run so-yara-update to pull down the rules. You can learn more about scapy at secdev.org and itgeekchronicles.co.uk. 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. According to NIST, which step in the digital forensics process involves drawing conclusions from data? In a distributed deployment, the manager node controls all other nodes via salt. Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. 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. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. Any definitions made here will override anything defined in other pillar files, including global. Backing up current local_rules.xml file. 4. 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 Enter the following sample in a line at a time. Set anywhere from 5 to 12 in the local_rules Kevin. /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. 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. Durian - Wikipedia Custom rules can be added to the local.rules file Rule threshold entries can . Answered by weslambert on Dec 15, 2021. Let's add a simple rule that will alert on the detection of a string in a tcp session. Basic snort rules syntax and usage [updated 2021] | Infosec Resources Integrating Snort 3.0 (SnortSP) and Sguil in 3 Steps - Security Onion Custom local.rules not showing up in kibana NIDS page #1712 - GitHub 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 Onion Lab Setup with VirtualBox | Free Video Tutorial - Udemy 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. If . 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. and dont forget that the end is a semicolon and not a colon. 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 you built the rule correctly, then snort should be back up and running. 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. 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, consider the following rules that reference the ET.MSSQL flowbit. 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. Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. 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. Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. There isnt much in here other than anywhere, dockernet, localhost and self. See above for suppress examples. Use one of the following examples in your console/terminal window: sudo nano local.rules sudo vim local.rules. You need to configure Security Onion to send syslog so that InsightIDR can ingest it. 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. 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. Copyright 2023 This is located at /opt/so/saltstack/local/pillar/minions/.sls. Youll need to ensure the first of the two properly escapes any characters that would be interpreted by regex. /opt/so/saltstack/default/salt/firewall/hostgroups.yaml is where the default hostgroups are defined. This error now occurs in the log due to a change in the exception handling within Salts event module. 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. You can add Wazuh HIDS rules in /opt/so/rules/hids/local_rules.xml. Salt can be used for data-driven orchestration, remote execution for any infrastructure, configuration management for any app stack, and much more. Diagnostic logs can be found in /opt/so/log/salt/. Do you see these alerts in Squert or ELSA? Salt sls files are in YAML format. Adding Local Rules Security Onion 2.3 documentation There are two directories that contain the yaml files for the firewall configuration. Please review the Salt section to understand pillars and templates. This is an advanced case and you most likely wont never need to modify these files. (Archived 1/22) Tuning NIDS Rules in Security Onion - YouTube This wiki is no longer maintained. These non-manager nodes are referred to as salt minions. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you don't want your network sensors to process. 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. For example, suppose we want to disable SID 2100498. 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. Entry-Level Network Traffic Analysis with Security Onion - Totem AddingLocalRules Security-Onion-Solutions/security-onion Wiki Write your rule, see Rules Format and save it. Managing Alerts Security Onion 2.3 documentation Manager of Support and Professional Services. 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. I have had issues with Sguil when working with a snapshot and have not found a fix yet.. On Monday, June 26, 2017 at 8:28:44 PM UTC+5:30, KennyWap wrote: security-onion+unsubscribe@googlegroups.com, https://groups.google.com/group/security-onion. To add local YARA rules, create a directory in /opt/so/saltstack/local/salt/strelka/rules, for example localrules. This first sub-section will discuss network firewalls outside of Security Onion. securityonion-docs/local-rules.rst at master Security-Onion-Solutions How to exclude IP After enabling all default Snort Rules - Google Groups 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. After viewing your redacted sostat it seems that the ICMP and UDP rules are triggering: Are you using SO with in a VM? OSSEC custom rules not generating alerts - Google Groups Some node types get their IP assigned to multiple host groups. The remainder of this section will cover the host firewall built into Security Onion. 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. Beta ManagingAlerts Security-Onion-Solutions/security-onion Wiki - GitHub For a quick primer on flowbits, see https://blog.snort.org/2011/05/resolving-flowbit-dependancies.html. 1. idstools helpfully resolves all of your flowbit dependencies, and in this case, is re-enabling that rule for you on the fly. While Vanderburgh County was the seventh-largest county in 2010 population with 179,703 people, it is also the eighth-smallest county in area in Indiana and the smallest in southwestern Indiana, covering only 236 square miles (610 km2). Also ensure you run rule-update on the machine. For some alerts, your understanding of your own network and the business being transacted across it will be the deciding factor. Was this translation helpful? 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 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. The county seat is in Evansville. For more information, please see https://docs.saltproject.io/en/latest/topics/troubleshooting/yaml_idiosyncrasies.html. When editing these files, please be very careful to respect YAML syntax, especially whitespace. Security onion troubleshooting - silvestermallorca.de These are the files that will need to be changed in order to customize nodes. We've been teaching Security Onion classes and providing Professional Services since 2014. Our documentation has moved to https://securityonion.net/docs/. Then tune your IDS rulesets. Port groups are a way of grouping together ports similar to a firewall port/service alias. Salt Security Onion 2.3 documentation Local pillar file: This is the pillar file under /opt/so/saltstack/local/pillar/. To unsubscribe from this group and stop receiving emails from it, send an email to. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Adding local rules in Security Onion is a rather straightforward process. > To unsubscribe from this topic . 41 - Network Segmentation, VLANs, and Subnets. . 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. 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 As you can see I have the Security Onion machine connected within the internal network to a hub. 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. Salt is a core component of Security Onion 2 as it manages all processes on all nodes. Revision 39f7be52. On Thursday, June 15, 2017 at 5:06:51 PM UTC+5:30, Wes wrote: Is it simply not triggering, or causing an error? 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. 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. If you need to increase this delay, it can be done using the salt:minion:service_start_delay pillar. We offer both training and support for Security Onion. 'Re: [security-onion] Rule still triggering even after modifying to This directory stores the firewall rules specific to your grid. idstools may seem like it is ignoring your disabled rules request if you try to disable a rule that has flowbits set. Default pillar file: This is the pillar file located under /opt/so/saltstack/default/pillar/. You can read more about this at https://redmine.openinfosecfoundation.org/issues/4377. > > > > > > > > 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. Local YARA rules Discussion #6556 Security-Onion - GitHub 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,. Finally, from the manager, update the config on the remote node: You can manage threshold entries for Suricata using Salt pillars. I went ahead and put in the below rules under /etc/nsm/local.rules and ran the rule-update command. Our appliances will save you and your team time and resources, allowing you to focus on keeping your organization secure. 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. To unsubscribe from this group and stop receiving emails from it, send an email to security-onio.@googlegroups.com. Give feedback. 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. Security Onion is a free and open source platform for threat hunting, network security monitoring, and log management. 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 ->. You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. Alternatively, run salt -G 'role:so-sensor' cmd.run "so-strelka-restart" to restart Strelka on all sensors at once.