a portscan. First we define a schedule, how often should the Watch be executed: Next, define what query search_type to run, on what indices and document types: Now specify what condition would trigger the watch: The above groovy script will scan our aggregated results and look for a unique_port_count bucket where the cardinality is greater than 50; so putting within context, if a host has established within 30 seconds timerange, more than 50 connection each using a different port against another host, we will call this a portscan. We're now at the stage where events are coming into Elasticsearch and we want to be automatically alerted when our monitored host will receive (or launch!) Depending on how you have elasticsearch configured, you may need to build an SSH tunnel to allow your computer to communicate with your elasticsearch node. Questions/Comments? © 2020. Navigate to your logstash directory. This is what our indexed event looks like: We can define a TCP host portscan as a large amount of connections attempted within a short amount of time between a source and a target host, where the target port is always changing from connection to connection. Next we'll see how we can use Watcher to automatically receive an email when an event like this happens. Nmap has a command-line argument which allows you to output the nmap results in an xml formatted report. When I click 12201 on the destination port pie chart, Kibana re filters and re graphs data according to the selection I made. Add your logstash config to the directory. What’s new in Elastic Enterprise Search 7.9.0, What's new in Elastic Observability 7.9.0.

To ingest your nmap scans, you will have to output it in a format that can ingest into Elasticsearch.

Following the same approach, we will show how to use the Elastic stack to cover a basic network security use case, TCP host portscan detection, for which we'll implement alerting via email. To be able to use my config, you will need to download a template from the github page which is referenced in the config file. There is a script called VulnToEs, which is available on Github, that can be used to index Nessus, OpenVas, Nikto, and Nmap results into Elasticsearch. Network Mapper is a free and open source (license) utility for network discovery and security auditing. Send a nice email to warn us!

This script makes use of the Python API for Elasticsearch. While we impatiently wait for Packetbeat Flows to be released and allow more out-of-the-box network protocol level capture capabilities, we'll use tcpdump capture using the below command for the purpose of this blog: the above command will listen on the eth0 network interface of the monitored host and capture all and only the TCP packets indicating that a new TCP connection handshake was initiated, also avoiding resolving IP to hostnames for faster execution; then we pipe the results to netcat to send them to our Logstash instance for event processing, which we assume here to be running locally. Discover how easy it is to manage and scale your Elasticsearch environment. You can create visualizations of your nmap data in Kibana and eventually create dashboards from these visualizations. How can I run ElasticSearch on port 80? This tutorial shows you how to index NMAP Port Scan results into Elasticsearch. PORT STATE SERVICE 80/tcp open http 8080/tcp open http-proxy |_elasticsearch: looks like elasticsearch A few seconds later, we receive an email: Et voila!

Many systems and network administrators also find it useful for tasks such as network inventory, managing service upgrade schedules, and monitoring host or service uptime. 5 comments Open Port Scan Detection #1615. To use the logstash nmap codec plugin, you will need to install it. Effectively monitoring security across a large organization is a non-trivial task faced everyday by all sorts of organizations.The speed, scalability and flexibility of the Elastic stack can play as a great asset when trying to get visibility and proactively monitoring large amounts of data.

I immediately can see that, TCP traffic nearly diminished, and only UDP traffic is hitting port 12201, which happened to be the GrayLog server's default port listening for logs send by the various app servers. This is how to index the nmap report into Elasticsearch using the script: In Sense, create the index that you are going to index the data to.

Critical skill-building and certification. Now back to the nmap directory. You should now only have two files in this directory.

We'll use logstash to mangle the data and extract the information relevant to this use case, namely timestamp, src_ip and dst_port. If you’re unaware, I warn you that using nmap to port scan IP addresses of infrastructure that you don’t own is most likely illegal in your country. For example, if your computer’s IP address is 192.168.1.150 and your elasticsearch node is at 192.168.1.2, you could open port 9200 on your local computer by running: Alternatively, you can create the index from your server’s command line using curl. To be safe, scan only your own infrastructure, or get permission to do so. I am however able to run it on other ports like 8000, but when we are pointing to port 80 it doesn't seem to work.. http.port: 8000 (This works) http.port: 80 (Doesn't seem to work) Anyone is allowed to scan scanme.nmap.org. You can check your scan results with: Now, we need to ingest this report.

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Network Mapper is a free and open source (license) utility for network discovery and security auditing. Note we're purely interested in aggregated results, hence setting size:0.

Elasticsearch, BV and Qbox, Inc., a Delaware Corporation, are not affiliated. The response we receive looks like: From the above we can infer that host 192.168.1.17 has initiated 41 different TCP connections against host 192.168.1.105 which seems suspicious: 192.168.1.17 is our attacker. Apache, Apache Lucene, Apache Hadoop, Hadoop, HDFS and the yellow elephant logo are trademarks of the Apache Software Foundation in the United States and/or other countries. Watcher is our friend here, all we need to do is to configure a service email account, then define a new Watch and define how to act when a portscan is detected.

I modified the elasticsearch.yml file to point to port 80, but it doesn't seem to work.. Now on to seeing some action, let's login to a host that has connectivity towards our monitored host (in this example 192.168.1.105) and launch a port scan against it: Explicitly looking to probe privileged ports from 1 to 500. # nfdump -Nqr fnf1.dump -o "fmt:%ts, %sa, %sp, %da, %dp, %byt, %pkt, %out, %pr" > fnf1.csv, http://localhost:9200/netflowlab/_optimize?max_num_segments=1, Port Scan Detection using ElasticSearch and Kibana, NetFlow Analysis using ElasticSearch & Kibana, Kibana dashboard showing various NetFlow metrics. Remember, the script can be used for Nessus, OpenVas, and Nikto reports, too.

Using this approach, correlation logic can be applied to all the events, regardless of the datasource from which the event originated from.

For convenience, we can launch the above command using a all time favourite linux CLI utility, screen. Last, what action should our Watch perform once its conditions are met? You might need to install ruby-nmap to install this plugin. https://www.elastic.co/blog/elasticsearch-and-siem-implementing-host-portscan-detection where SSH_AUTH_X are our custom defined grok patterns to match success/failure events. The alert was triggered and intended watch action was performed. Make sure to use screen and start Kibana in its own window. This is what the captured raw data looks like. Have fun and remember to only run nmap or vulnerability scans against infrastructure that you own or have permission to scan. nmap --open --script ./elasticsearch.lua x.x.x.0/24 -p 80,8080 Nmap scan report for x.x.x.x Host is up (0.0018s latency). This article assumes that you know how to use nmap. As a side node, if you like NMap, take a look at this blog post to see all the awesome things you can do using logstash-codec-nmap. Start Elasticsearch and then Kibana. On my server, the directory is located at /opt/logstash.

Specifically terms and cardinality aggregations. What we do here is scanning again through the results to pick the attacker and target hosts, plus the count of how many unique ports were scanned.

Make sure you have the latest version of logstash, especially if you are having trouble installing the logstash-codec-nmap plugin. Elasticsearch, Logstash, and Kibana are trademarks of Elasticsearch, BV, registered in the U.S. and in other countries. Just for the sake of our examples, create a directory to store your reports and config, and work from there. Also host 192.168.1.105 has initiated 2 TCP connections against hosts 192.168.1.10 and 192.168.1.32, which seems legitimate. We are going to assume you have more than one report that you would like to parse. Port Scan Detection using ElasticSearch and Kibana. As we have extracted the information we were after (timestamp,src_ip,dst_ip) we can decide to trash message and payload fields: Next we send these events to Elasticsearch index logstash-tcpdump-%{+YYYY.MM.dd}. The above groovy script will scan our aggregated results and look for a unique_port_count bucket where the cardinality is greater than 50; so putting within context, if a host has established within 30 seconds timerange, more than 50 connection each using a different port … Before you do that, make sure to install this: This is what you should have in your nmap-logstash.conf file: Now you can run logstash on your config. Also some tagging or categorization of the data can be performed. elasticsearch.exceptions.RequestError: TransportError(400, u'illegal_argument_exception', u'No search type for [scan]') 各位前辈有没有遇到过这个问题，在2.x上测试似乎木有问题 Note that we could have multiple detections from different hosts, however for the purpose of this blog post we limit ourselves to detecting and reporting only the first one in the list. How to Index NMAP Port Scan Results into Elasticsearch. For example a failed login, be it from a Linux. This is just an example of how to leverage the Elastic stack for performing security monitoring, creativity is the only limit.

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