Next we'll see how we can use Watcher to automatically receive an email when an event like this happens. On my server, the directory is located at /opt/logstash. 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. 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 … Have fun and remember to only run nmap or vulnerability scans against infrastructure that you own or have permission to scan. The alert was triggered and intended watch action was performed. Elasticsearch, BV and Qbox, Inc., a Delaware Corporation, are not affiliated. 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). 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}. Send a nice email to warn us! We are going to scan scanme.nmap.org, which is a host that is often used to test nmap with. 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. Anyone is allowed to scan scanme.nmap.org. Navigate to your logstash directory. You can check your scan results with: Now, we need to ingest this report. Posted In: ElasticSearch, Gezegen, NetFlow. This is what the captured raw data looks like. You can create visualizations of your nmap data in Kibana and eventually create dashboards from these visualizations. Make sure to use screen and start Kibana in its own window. 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. 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. 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. © Copyright 2020 Qbox, Inc. All rights reserved. Using this approach, correlation logic can be applied to all the events, regardless of the datasource from which the event originated from. Note we're purely interested in aggregated results, hence setting size:0. How to Index NMAP Port Scan Results into Elasticsearch. This outputs the results to report.xml in the current directory. $ nmap -p9200 --script=elasticsearch 10.0.1.11 Starting Nmap 7.01 ( https://nmap.org ) at 2018-06-17 16:42 CEST Nmap scan report for 10.0.1.11 Host is up (0.00086s latency). Remember, the script can be used for Nessus, OpenVas, and Nikto reports, too. where SSH_AUTH_X are our custom defined grok patterns to match success/failure events. 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. Elasticsearch, Logstash, and Kibana are trademarks of Elasticsearch, BV, registered in the U.S. and in other countries. For this tutorial we are assuming that you created a directory, “nmap”, where you will have multiple reports. Port Scan Detection using ElasticSearch and Kibana. © 2020. https://www.elastic.co/blog/elasticsearch-and-siem-implementing-host-portscan-detection For convenience, we can launch the above command using a all time favourite linux CLI utility, screen. 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. Network Mapper is a free and open source (license) utility for network discovery and security auditing. PORT STATE SERVICE 80/tcp open http 8080/tcp open http-proxy |_elasticsearch: looks like elasticsearch Network Mapper is a free and open source (license) utility for network discovery and security auditing. 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) 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. I am adding it in a file named nmap-logstash.conf. 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. 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. Elasticsearch B.V. All Rights Reserved. This article assumes that you know how to use nmap. This tutorial shows you how to index NMAP Port Scan results into Elasticsearch. To use the logstash nmap codec plugin, you will need to install it. You might need to install ruby-nmap to install this plugin. We have just indexed our nmap report into Elasticsearch. 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. We'll use logstash to mangle the data and extract the information relevant to this use case, namely timestamp, src_ip and dst_port. 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. Questions/Comments? # 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. Start Elasticsearch and then Kibana. For this use case we will want to monitor all events indicating a new TCP connection being initiated from source to target host, in short all TCP packets with SYN=1, ACK=0. 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. Drop us a line below. To be safe, scan only your own infrastructure, or get permission to do so. 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. Now back to the nmap directory. 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. For example a failed login, be it from a Linux. NEK : Netflow + ElasticSearch + Kibana: One of the most fundamentals of security monitoring is to be aware of port scans which can be part of reconnaissance activity. 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!) 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. If you are making use of nmap, then you probably also use OpenVas or Nessus.
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