The second only needs the $ character escaped to prevent bash from treating that as a variable. 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. Add the following to the sensor minion pillar file located at. This is an advanced case and you most likely wont never need to modify these files. Please provide the output of sostat-redacted, attaching as a plain text file, or by using a service like Pastebin.com. Open /etc/nsm/rules/local.rules using your favorite text editor. https://docs.securityonion.net/en/2.3/local-rules.html?#id1. Reboot into your new Security Onion installation and login using the username/password you specified in the previous step. Salt Security Onion 2.3 documentation You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. However, generating custom traffic to test the alert can sometimes be a challenge. . How to create and monitor your Snort's rules in Security Onion? 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. Introduction Adding local rules in Security Onion is a rather straightforward process. 5. 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. Finally, run so-strelka-restart to allow Strelka to pull in the new rules. The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. Revision 39f7be52. /opt/so/saltstack/default/salt/firewall/portgroups.yaml is where the default port groups are defined. In this file, the idstools section has a modify sub-section where you can add your modifications. Here, we will show you how to add the local rule and then use the python library scapy to trigger the alert. If it is, then the most expedient measure may be to resolve the misconfiguration and then reinvestigate tuning. the rule is missing a little syntax, maybe try: alert icmp any any -> $HOME_NET any (msg:"ICMP Testing"; sid:1000001; rev:1;). PFA local.rules. 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. and dont forget that the end is a semicolon and not a colon. 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. There isnt much in here other than anywhere, dockernet, localhost and self. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you don't want your network sensors to process. securityonion-docs/local-rules.rst at master Security-Onion-Solutions alert icmp any any -> any any (msg: "ICMP Testing"; sid:1000001; rev:1;). 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, Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/local.rules. 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. This first sub-section will discuss network firewalls outside of Security Onion. 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. Are you sure you want to create this branch? Managing Rules; Adding Local Rules; Managing Alerts; High Performance Tuning; Tricks and Tips. OSSEC custom rules not generating alerts - Google Groups From the Command Line. > > > > > > > > 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. These non-manager nodes are referred to as salt minions. You need to configure Security Onion to send syslog so that InsightIDR can ingest it. 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 { Please note that Suricata 6 has a 64-character limitation on the IP field in a threshold. 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. Some node types get their IP assigned to multiple host groups. You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. 2 Persons $40,550. 6 Persons $58,800. 3 Persons $45,600. 7 Persons Files here should not be modified as changes would be lost during a code update. Firewall Security Onion 2.3 documentation 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. Introduction to Sguil and Squert: Part 1 - Security Onion Manager of Support and Professional Services. 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). Security Onion uses idstools to download new signatures every night and process them against a set list of user generated configurations. 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. /opt/so/saltstack/local/salt/firewall/portgroups.local.yaml defines custom port groups. Assuming you have Internet access, Security Onion will automatically update your NIDS rules on a daily basis. Data collection Examination Security Onion: June 2013 There are three alerting engines within Security Onion: Suricata, Wazuh and Playbook (Sigma). Beta Security Onion a free and open platform for intrusion detection, enterprise security monitoring, and log management. c96 extractor. In Security Onion, locally created rules are stored in /opt/so/rules/nids/local.rules. Copyright 2023 The county seat is in Evansville. While Vanderburgh County was the This will add the host group to, Add the desired IPs to the host group. 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. 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. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. Salt sls files are in YAML format. If SID 4321 is noisy, you can disable it as follows: From the manager, run the following to update the config: If you want to disable multiple rules at one time, you can use a regular expression, but make sure you enclose the full entry in single quotes like this: We can use so-rule to modify an existing NIDS rule. "; reference: url,http://holisticinfosec.blogspot.com/2011/12/choose-2011-toolsmith-tool-of-year.html; content: "toolsmith"; flow:to_server; nocase; sid:9000547; metadata:policy security-ips; rev:1). This section will cover both network firewalls outside of Security Onion and the host-based firewall built into Security Onion. Security Onion Layers Ubuntu based OS Snort, Suricata Snorby Bro Sguil Squert Important "Security Onion" Files and Directories - Medium When editing these files, please be very careful to respect YAML syntax, especially whitespace. Copyright 2023 Revision 39f7be52. 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). 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. Re: [security-onion] Snort Local rules not getting alerts in ELSA / SQUERT Use one of the following examples in your console/terminal window: sudo nano local.rules sudo vim local.rules. Saltstack states are used to ensure the state of objects on a minion. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka. Identification. Copyright 2023 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. Tracking. 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.