In a distributed deployment, the manager node controls all other nodes via salt. 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 ->. The default allow rules for each node are defined by its role (manager, searchnode, sensor, heavynode, etc) in the grid. However, generating custom traffic to test the alert can sometimes be a challenge. In 2008, Doug Burks started working on Security Onion, a Linux distribution for intrusion detection, network security monitoring, and log management. Diagnostic logs can be found in /opt/so/log/salt/. Custom rules can be added to the local.rules file Rule threshold entries can . 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. When editing these files, please be very careful to respect YAML syntax, especially whitespace. According to NIST, which step in the digital forensics process involves drawing conclusions from data? For a Security Onion client, you should dedicate at least 2GB RAM, but ideally 4GB if possible. If you built the rule correctly, then snort should be back up and running. Tracking. When setup is run on a new node, it will SSH to the manager using the soremote account and add itself to the appropriate host groups. c96 extractor. You can see that we have an alert with the IP addresses we specified and the TCP ports we specified. The remainder of this section will cover the host firewall built into Security Onion. Escalate local privileges to root level. Security Onion is a free and open platform for threat hunting, enterprise security monitoring, and log management. Generate some traffic to trigger the alert. Start by creating Berkeley Packet Filters (BPFs) to ignore any traffic that you don't want your network sensors to process. (Alternatively, you can press Ctrl+Alt+T to open a new shell.) Please note! 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. You can add Wazuh HIDS rules in /opt/so/rules/hids/local_rules.xml. Inside of /opt/so/saltstack/local/salt/strelka/rules/localrules, add your YARA rules. To enabled them, either revert the policy by remarking the ips_policy line (and run rule-update), or add the policy type to the rules in local.rules. In the configuration window, select the relevant form of Syslog - here, it's Syslog JSON - and click. 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. 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. One thing you can do with it (and the one that most people are interested in) is to configure it for IDS mode. 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. The signature id (SID) must be unique. Now we have to build the association between the host group and the syslog port group and assign that to our sensor node. Copyright 2023 Run so-rule without any options to see the help output: We can use so-rule to modify an existing NIDS rule. /opt/so/saltstack/local/pillar/minions/, https://www.proofpoint.com/us/threat-insight/et-pro-ruleset, https://www.snort.org/downloads/#rule-downloads, https://www.snort.org/faq/what-are-community-rules, https://snort.org/documents/registered-vs-subscriber, license fee per sensor (users are responsible for purchasing enough licenses for their entire deployment), Snort SO (Shared Object) rules only work with Snort not, same rules as Snort Subscriber ruleset, except rules only retrievable after 30 days past release, not officially managed/supported by Security Onion. The server is also responsible for ruleset management. This repository has been archived by the owner on Apr 16, 2021. Any line beginning with "#" can be ignored as it is a comment. As shown above, we edit the minion pillar and add the SID to the idstools - sids - disabled section. 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. You need to configure Security Onion to send syslog so that InsightIDR can ingest it. Now that we have a signature that will generate alerts a little more selectively, we need to disable the original signature. 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. Logs . Once logs are generated by network sniffing processes or endpoints, where do they go? Files here should not be modified as changes would be lost during a code update. Once your rules and alerts are under control, then check to see if you have packet loss. You can add NIDS rules in /opt/so/saltstack/local/salt/idstools/local.rules on your manager. These non-manager nodes are referred to as salt minions. However, the exception is now logged. Default pillar file: This is the pillar file located under /opt/so/saltstack/default/pillar/. Security Onion includes best-of-breed free and open tools including Suricata, Zeek, Wazuh, the Elastic Stack and many others. Full Name. 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). I've just updated the documentation to be clearer. To verify the Snort version, type in snort -Vand hit Enter. Security Onion generates a lot of valuable information for you the second you plug it into a TAP or SPAN port. 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. Its important to note that with this functionality, care should be given to the suppressions being written to make sure they do not suppress legitimate alerts. You signed in with another tab or window. Pillars are a Saltstack concept, formatted typically in YAML, that can be used to parameterize states via templating. This directory contains the default firewall rules. The easiest way to test that our NIDS is working as expected might be to simply access http://testmynids.org/uid/index.html from a machine that is being monitored by Security Onion. There isnt much in here other than anywhere, dockernet, localhost and self. All the following will need to be run from the manager. 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. A tag already exists with the provided branch name. 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. Generate some traffic to trigger the alert. 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 pivot from that alert to the corresponding pcap you can verify the payload we sent. Salt is a new approach to infrastructure management built on a dynamic communication bus. Tried as per your syntax, but still issue persists. Add the following to the sensor minion pillar file located at. 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). 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 Within 15 minutes, Salt should then copy those rules into /opt/so/rules/nids/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? 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. > > > > > > > > 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. Have you tried something like this, in case you are not getting traffic to $HOME_NET? Where is it that you cannot view them? Download Security Onion 20110116. When configuring network firewalls for distributed deployments, youll want to ensure that nodes can connect as shown below. Here are some of the items that can be customized with pillar settings: Currently, the salt-minion service startup is delayed by 30 seconds. 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. Home About Us Bill Pay 877-213-8180 Product Library My accountItems of interest (0) Get your campus card Your campus card allows you to borrow books from the Library, use services at the student centre, make payments at Macquarie University retail outlets, and identify yourself during class tests and . You may want to bump the SID into the 90,000,000 range and set the revision to 1. 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. 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. This will add the host group to, Add the desired IPs to the host group. 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. Please provide the output of sostat-redacted, attaching as a plain text file, or by using a service like Pastebin.com. That's what we'll discuss in this section. More information on each of these topics can be found in this section. PFA local.rules. 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 1. Enter the following sample in a line at a time. From the Command Line. These non-manager nodes are referred to as salt minions. You can learn more about snort and writing snort signatures from the Snort Manual. After adding your rules, update the configuration by running so-strelka-restart on all nodes running Strelka.