This post marks the second instalment of the Create enterprise monitoring at home series, here is part one in case you missed it. This how-to will not cover this. Some people may think adding Suricata to our SIEM is a little redundant as we already have an IDS in place with Zeek, but this isnt really true. Many applications will use both Logstash and Beats. Now its time to install and configure Kibana, the process is very similar to installing elastic search. Now after running logstash i am unable to see any output on logstash command window. If you are short on memory, you want to set Elasticsearch to grab less memory on startup, beware of this setting, this depends on how much data you collect and other things, so this is NOT gospel. There are usually 2 ways to pass some values to a Zeek plugin. If both queue.max_events and queue.max_bytes are specified, Logstash uses whichever criteria is reached first. In this (lengthy) tutorial we will install and configure Suricata, Zeek, the ELK stack, and some optional tools on an Ubuntu 20.10 (Groovy Gorilla) server along with the Elasticsearch Logstash Kibana (ELK) stack. assigned a new value using normal assignments. Im going to use my other Linux host running Zeek to test this. runtime, they cannot be used for values that need to be modified occasionally. Revision abf8dba2. I used this guide as it shows you how to get Suricata set up quickly. We will first navigate to the folder where we installed Logstash and then run Logstash by using the below command -. value changes. # Change IPs since common, and don't want to have to touch each log type whether exists or not. events; the last entry wins. From https://www.elastic.co/guide/en/logstash/current/persistent-queues.html: If you experience adverse effects using the default memory-backed queue, you might consider a disk-based persistent queue. you want to change an option in your scripts at runtime, you can likewise call If there are some default log files in the opt folder, like capture_loss.log that you do not wish to be ingested by Elastic then simply set the enabled field as false. After you are done with the specification of all the sections of configurations like input, filter, and output. Thanks in advance, Luis Is currently Security Cleared (SC) Vetted. We can redefine the global options for a writer. On dashboard Event everything ok but on Alarm i have No results found and in my file last.log I have nothing. First we will enable security for elasticsearch. The output will be sent to an index for each day based upon the timestamp of the event passing through the Logstash pipeline. If you're running Bro (Zeek's predecessor), the configuration filename will be ascii.bro.Otherwise, the filename is ascii.zeek.. Note: The signature log is commented because the Filebeat parser does not (as of publish date) include support for the signature log at the time of this blog. Zeek Configuration. Figure 3: local.zeek file. A change handler function can optionally have a third argument of type string. Beats are lightweightshippers thatare great for collecting and shippingdata from or near the edge of your network to an Elasticsearch cluster. Running kibana in its own subdirectory makes more sense. value, and also for any new values. => change this to the email address you want to use. Logstash is an open source data collection engine with real-time pipelining capabilities logstashLogstash. Id recommend adding some endpoint focused logs, Winlogbeat is a good choice. The default configuration lacks stream information and log identifiers in the output logs to identify the log types of a different stream, such as SSL or HTTP, and differentiate Zeek logs from other sources, respectively. I have expertise in a wide range of tools, techniques, and methodologies used to perform vulnerability assessments, penetration testing, and other forms of security assessments. At this stage of the data flow, the information I need is in the source.address field. There are a wide range of supported output options, including console, file, cloud, Redis, Kafka but in most cases, you will be using the Logstash or Elasticsearch output types. You can of course always create your own dashboards and Startpage in Kibana. Once the file is in local, then depending on which nodes you want it to apply to, you can add the proper value to either /opt/so/saltstack/local/pillar/logstash/manager.sls, /opt/so/saltstack/local/pillar/logstash/search.sls, or /opt/so/saltstack/local/pillar/minions/$hostname_searchnode.sls as in the previous examples. Zeek includes a configuration framework that allows updating script options at runtime. My assumption is that logstash is smart enough to collect all the fields automatically from all the Zeek log types. Please keep in mind that events will be forwarded from all applicable search nodes, as opposed to just the manager. # # This example has a standalone node ready to go except for possibly changing # the sniffing interface. This is also true for the destination line. While your version of Linux may require a slight variation, this is typically done via: At this point, you would normally be expecting to see Zeek data visible in Elastic Security and in the Filebeat indices. So my question is, based on your experience, what is the best option? While traditional constants work well when a value is not expected to change at options: Options combine aspects of global variables and constants. If your change handler needs to run consistently at startup and when options . @Automation_Scripts if you have setup Zeek to log in json format, you can easily extract all of the fields in Logstash using the json filter. The Finally, Filebeat will be used to ship the logs to the Elastic Stack. There is differences in installation elk between Debian and ubuntu. If not you need to add sudo before every command. Please make sure that multiple beats are not sharing the same data path (path.data). Once thats done, complete the setup with the following commands. In order to protect against data loss during abnormal termination, Logstash has a persistent queue feature which will store the message queue on disk. Once Zeek logs are flowing into Elasticsearch, we can write some simple Kibana queries to analyze our data. Hi, Is there a setting I need to provide in order to enable the automatically collection of all the Zeek's log fields? you look at the script-level source code of the config framework, you can see includes a time unit. In filebeat I have enabled suricata module . ), event.remove("related") if related_value.nil? Zeek collects metadata for connections we see on our network, while there are scripts and additional packages that can be used with Zeek to detect malicious activity, it does not necessarily do this on its own. Filebeat ships with dozens of integrations out of the box which makes going from data to dashboard in minutes a reality. To build a Logstash pipeline, create a config file to specify which plugins you want to use and the settings for each plugin. Miguel I do ELK with suricata and work but I have problem with Dashboard Alarm. => You can change this to any 32 character string. Execute the following command: sudo filebeat modules enable zeek Monitor events flowing through the output with curl -s localhost:9600/_node/stats | jq .pipelines.manager. If you want to receive events from filebeat, you'll have to use the beats input plugin. . This is useful when a source requires parameters such as a code that you dont want to lose, which would happen if you removed a source. Example Logstash config: This blog covers only the configuration. Let's convert some of our previous sample threat hunting queries from Splunk SPL into Elastic KQL. If you go the network dashboard within the SIEM app you should see the different dashboards populated with data from Zeek! This next step is an additional extra, its not required as we have Zeek up and working already. I modified my Filebeat configuration to use the add_field processor and using address instead of ip. This line configuration will extract _path (Zeek log type: dns, conn, x509, ssl, etc) and send it to that topic. Comment out the following lines: #[zeek] #type=standalone #host=localhost #interface=eth0 You can of course use Nginx instead of Apache2. Step 3 is the only step thats not entirely clear, for this step, edit the /etc/filebeat/modules.d/suricata.yml by specifying the path of your suricata.json file. Ready for holistic data protection with Elastic Security? And past the following at the end of the file: When going to Kibana you will be greeted with the following screen: If you want to run Kibana behind an Apache proxy. not run. The other is to update your suricata.yaml to look something like this: This will be the future format of Suricata so using this is future proof. Its not very well documented. Dowload Apache 2.0 licensed distribution of Filebeat from here. I'm not sure where the problem is and I'm hoping someone can help out. Also keep in mind that when forwarding logs from the manager, Suricatas dataset value will still be set to common, as the events have not yet been processed by the Ingest Node configuration. To install Suricata, you need to add the Open Information Security Foundation's (OISF) package repository to your server. If From the Microsoft Sentinel navigation menu, click Logs. When I find the time I ill give it a go to see what the differences are. This is what that looks like: You should note Im using the address field in the when.network.source.address line instead of when.network.source.ip as indicated in the documentation. invoke the change handler for, not the option itself. Only ELK on Debian 10 its works. zeek_init handlers run before any change handlers i.e., they PS I don't have any plugin installed or grok pattern provided. ## Also, peform this after above because can be name collisions with other fields using client/server, ## Also, some layer2 traffic can see resp_h with orig_h, # ECS standard has the address field copied to the appropriate field, copy => { "[client][address]" => "[client][ip]" }, copy => { "[server][address]" => "[server][ip]" }. The data it collects is parsed by Kibana and stored in Elasticsearch. I assume that you already have an Elasticsearch cluster configured with both Filebeat and Zeek installed. from the config reader in case of incorrectly formatted values, which itll Enabling a disabled source re-enables without prompting for user inputs. Deploy everything Elastic has to offer across any cloud, in minutes. While a redef allows a re-definition of an already defined constant The number of workers that will, in parallel, execute the filter and output stages of the pipeline. This blog will show you how to set up that first IDS. Are you sure you want to create this branch? However, that is currently an experimental release, so well focus on using the production-ready Filebeat modules. from a separate input framework file) and then call >I have experience performing security assessments on . In the configuration file, find the line that begins . Logstash pipeline configuration can be set either for a single pipeline or have multiple pipelines in a file named logstash.yml that is located at /etc/logstash but default or in the folder where you have installed logstash. I will give you the 2 different options. By default, Logstash uses in-memory bounded queues between pipeline stages (inputs pipeline workers) to buffer events. 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