Lookup dns lookup splunk software

There are several ways to detect data exfiltration with splunk for protection. Enabling automatic lookups in farsight dnsdb app for splunk. Dns tunneling is a method to bypass security controls and exfiltrate data from a targeted organization. This can create a metric ton of lookup requests to the dns servers your splunk server normally points at. External lookup uses python scripts or binary executables to populate your events with field values from an external source. Umbrella addon for splunk enterprise requires the following software. Initially we were going to run a reverse dns lookup against the ips to see what pointer records they had, however, we thought doing a whois lookup would be higher integrity. Define an external lookup in splunk web splunk documentation. Logging dns transactions from different sources such as network taps and the dns servers themselves can generate large volumes of data to investigate. If splunk software finds those fieldvalue combinations in your lookup table, splunk software will append the corresponding fieldvalue combinations from the table to the events in your search. If you have splunk cloud and want to define external lookups, file a support ticket. For an introduction to this command, please consult bob foxs blog entry discussing example usage. Splunk software uses lookups to match fieldvalue combinations in your event data with fieldvalue combinations in external lookup tables. Ensure you can open the file in excel and no issues with delimiters.

Detect and prevent data exfiltration with splunk welcome. Making the most of your logs dns with splunk flatiron health. Whois api splunk application tutorial platforms whois. Use lookup to add fields from lookup tables splunk documentation. You use a geospatial lookup to create a query that splunk software uses to. Using this match, you can enrich your event data with additional fields. The lookup does not need to be defined in nf or nf for you to use this command, but lookup table you reference must be uploaded to splunk enterprise this command to manually invoke lookup definitions that exist in nf. Created list of verified known ip as a csv file saved in my local system. Contributors of all backgrounds and levels of expertise come here to find solutions to their issues, and to help other users in the splunk community. You access it by running a search with the lookup command.

Lookups are incorporated into dashboards and forms to provide content in a human readable format, allowing users to interact with event data without knowing obscure or cryptic event fields. Ip reputation app for splunk enterprise splunkbase. Suppose you have a lookup table specified in a stanza named usertogroup in the nf file. Detecting dns data exfiltration talos blog cisco talos. Splunk search doesnt match csv lookup file stack overflow.

Making the most of your logs dns with splunk flatiron. Using file contents as input for search splunkblogs. Lookup tablecommand correlate external information with search results. Lookups are very commonly used in splunk to enrich the data in splunk results. To follow along with this example in your splunk deployment, download these csv files and complete the steps in the use field lookups section of the search tutorial for both the prices. You can skip the step in the tutorial that makes the lookups automatic.

When you create the lookup definition for the vendors. Getting additional ipnetworklocation info along with. You could run scheduled searches against the dhcp dns logs to append to a timebased lookup file, which can be referenced for your sourcetype to perform the lookup at search time for your other data. Hi we are currently testing out splunk to monitor our cisco asa 5510 firewall, but running into a problem. We call splunk s native lookup function and filter out null metadata to get an inner join. For example you are searching for user logging details in splunk and result shows username and login details as result, but you want to add department name. External lookup, an external source, such as a dns server.

In this section, we will configure a simple splunk lookup. This is a link which shows all the core features available in splunk. You can set up a lookup using the lookups page in splunk web or by configuring stanzas in the nf and nf files. Dnsdb is the most comprehensive database of passive dns data about how ips, domains, and internet. Entered in the ip address of my syslog host and syslog port.

Syslogng can be configured to do reverse dns lookups using the following options. Tobys tutorial takes a look at a method that will alert you when a machine deviates from its normal behavior, so you can easily spot suddenly voluminous dns traffic. Chanced upon some of the info by accident smack at the bottom of one part of the splunk documentation, but i cant find it now. I just want to presumably use lookup dnslookup to have splunk query local dns to resolve hostnames from ips. Splunk 1 splunk is a software which processes and brings out insight from machine data and other forms of big data. Click add new in the lookup definitions to create a linkage between splunk and the csv we just uploaded. Splunk enterprise security delivers safetyspecific dashboards reports and notable events to analyze attacks. Use dns data to identify malware patient zero splunk. We call splunks native lookup function and filter out null metadata to get an inner join. If you have automatic lookups configured in the nf file, the lookup command. Additionally, with victorops as part of the splunk family, you can count. Using splunk to detect dns tunneling sti graduate student research by steve jaworski june 1, 2016. In any event, heres the steps we did to run a reverse dns lookup on all the domains and permutations.

Splunk lookup command can accept multiple event fields and destfields. Fill in one or more commaseparated domain names or ipv4 addresses. Whois api splunk application tutorial platforms whois lookup. Sep 01, 2016 now, were ready to look for intersections between our malicious domain list and dns logs. Dns, query, string, the domain which needs to be resolved. Splunk lookup helps you in adding a field from an external source based on the value that matches your field in the event data. Ive been using splunk and dns data to find badness in networks since 2011 and i continually find new methods and approaches. Our new app helps splunk customers uncover domain profile data for over 5. How to create a splunk kv store state table or lookup in 10. The splunk lookup commands allows you to use data from an external source to enrich the data you already have in splunk. Splunk supports static csv or the output of a python script as a lookup. Mar 20, 2018 ive been using splunk and dns data to find badness in networks since 2011 and i continually find new methods and approaches.

In the udm pro, settings under network settings advanced enable syslog. Because we are using a dhcp server on all client pcs, just having ip address in the event data is no good. Geospatial lookup a kmz compressed keyhole markup language file, used to define boundaries of mapped regions such as countries, us states, and us counties. If you have the dhcp dns info also stored in splunk, you could make use of it in various ways to meet your needs. Udm pro console, syslog watcher windows, splunk forwarder 8. The datasets listing page lists them alongside data model datasets and table datasets. Currently its contacting the project honey pot database via dns blacklist requests. Now, were ready to look for intersections between our malicious domain list and dns logs. Inputlookup command loads the search results from a specified static lookup table. Bluecat dns edge is a cloudbased, clientfacing firewall that leverages an organizations existing dns data and infrastructure to provide visibility, control, and cyber threat detection capabilities to an organization.

Previous post previous splunk dns lookup performance and caching with dnsmasq. Domaintools app for splunk and splunk es splunkbase. Note that we do not cover external scripted lookups or timebased lookups. Splunk cloud is a saas software as a service it offers almost similar features as the enterprise version, including apis, sdks, and apps. Splunk a dns lookup for abuse contacts george starcher. Derek king, our security brother from england, has chosen to write on a subject near and dear to my heart dns. The umbrella addon for splunk enterprise for splunk enterprise is community supported. It enriches the data while comparing different event fields. It can translate fields into more meaningful information at search time.

If it resolves with wkhvlwhv ip address, that endpoint is susceptible to dns tunneling. This definition name will be used with the lookup command. Our efforts, in combination with splunk software, can be leveraged by security. There are two important search commands to create a splunk lookup input and output lookup. External, an external source, such as a dns server.

Still not the best solution as i still miss any system not pointed at our windows dns server. The recommendation for syslog by splunk ps is to put a syslog receiver in front of splunk instead of ingesting syslog directly. The lookup does not need to be defined in nf or nf for you to use this command, but lookup table you reference must be uploaded to splunk enterprise. This lookup is a function of the dns database trying to access dns information about a certain domain name. For example, you can add the lookup files and lookup definitions by choosing the lookup link. It scans the lookup table as specified by a filename or a table name. Dns lookups using cname of host entries windows dns event logs. There has been a lookup dnslookup in splunk for a long time now.

Splunks lookup feature lets you reference fields in an external csv file that match fields in your event data. If splunk software finds those fieldvalue combinations in your lookup table, splunk. The technology is based on machine learning algorithms applied to domaintools unparalleled coverage of domain name features and infrastructure characteristics. Splunk lookups tutorial csv lookup, kv store, scripted. The domaintools app for splunk is powered by the domaintools risk score, a proprietary scoring algorithm that finds malicious domain names before they can be weaponized. Going to share here anyway some or probably mostall of your searches might involve public ip addresses, and more often than not we would want to have additional info along with the ip address to work with. Lookup users and return the corresponding group the user belongs to. You can also perform instant whois lookups from within the whois lookup page. For now, i will assume you have basic knowledge about its usage and i will list a possible solution for trying to use or with many possible values for a field. This syntax reads run dnslookup, send it an ip address which we are going to get from the host field in the splunk event, then when the lookup occurs, return the host information back to splunk in the form of new field attached to each relevant event, called hostname. For example, dns queries collected by splunk stream.

Malware could encode stolen data as the subdomain part of a dns lookup for a domain where the nameserver is under control of an attacker. Configuration start with splunk cloud, add splunk enterprise security version 4. Lets take the easier approach first and use the splunk. Introduction to lookup configuration splunk documentation. Whois api splunk application tutorial platforms whois api.

A host suddenly spewing a ton of dns queries can be an indicator of either compromise or misconfiguration. The following is the steps required to create an external lookup for a splunk enterprise deployment. Lets take the easier approach first and use the splunk web interface. Splunk light is a free version which allows, to make a report, search and edit your log data. I check for dns service to make sure i have all my dns servers covered. Splunk software uses lookups to match fieldvalue combinations in your event data with. We have installed redis, transformed our data and loaded it into redis. A reverse dns record or ptr record is simply an entry that resolves an ip address back to a host name. In this scenario, splunk enterprise security es and splunk software for stream are used. I like to setup dnsmasq for local dns caching on my splunk search head to help reduce that load when ip lookups are repetitive. Dec 17, 2014 in this section, we will configure a simple splunk lookup.

In any event, heres the steps we did to run a reverse dns lookup on. Add field matching rules to your lookup configuration. Bluecat dns edge for splunk contains 2 lookup files. How to do dns lookup for eventtime question splunk. Do not make it an automatic lookup, as it is not optimized, and it does not need to apply to each events. Siem, aiops, application management, log management, machine learning, and compliance splunk. Are you trying to find out the location of website splunk. It does not have a nf component, so it is not an automatic lookup. In splunk i need to match search results client ip list with an input lookup csv file knownip. The python script is a fairly straight forward piece of code. Finding signal in the noise of dns data using splunk. You use a geospatial lookup to create a query that splunk software uses to configure a choropleth map.

Splunk enterprise security delivers safetyspecific dashboards. Here you will find all the available technical information about this website, like the fact that it is being hosted by on ip address 52. I deployed splunk stream on all my windows dns servers to collect the dns request off the wire. Below listing website ranking, similar webs, backlinks. Detect and prevent data exfiltration with splunk welcome to. Using splunk can help ingest the large volume of log data and. This domain was first 20180910 1 year, 232 days and hosted in denver united states, server ping response time 2 ms. Use the lookup table that you defined in nf as dnslookup. If you require professional support, please contact the author. We now have to prep splunk to play nicely with redis. Better to use a network tap to pick up all dns traffic. So lets start with just adding a simple external command lookup for getting the abuse contact for a given ip address.

Use the lookup table that you defined in splunk web as dnslookup. Most people are aware of the forward lookup, also known as an a record that finds an ip address from a host name so that an internet service is able to be accessed. Splunk dns lookup performance and caching with dnsmasq. I will sight an example of a static csv, once you have created a lookup you may use it in searches depending upon your use cases. You have a field lookup named dnslookup which references a python script that performs a dns and reverse dns lookup and accepts either a. This happens every time we visit a website on the internet by using a domain name.

That traffic load can cause unforeseen issues at times. The splunk addon for microsoft windows dns version 1. Bulk whois search bulk email verification ip geolocation lookup. On april 8, 2019, splunk announced that the splunk addon for microsoft windows dns would be deprecated effective july 7, 2019. Using this query you can see what countries are hammering your boxes and make nice graphs for the boss. I want the results, which didnt match with csv file. This going to require a dynamic external lookup in the form of a python script. Derek deals up some oldies but goodies, shows some awesome visualizations, and then brings some new slaying techniques to the adversary battle. A reverse lookup is when an ip address is used in lieu of a domain name and the domain name is the information being sought. The umbrella addon for splunk enterprise contains 1 lookup files.

If you are using this app in an onprem splunk enterprise deployment, you may be able to continue using this app, but splunk will not provide support in case of issues and we strongly recommend discontinuing use. Splunk enterprise has significant capabilities, such as the ability to create lookup files and ingest those files. Navigated manager lookups add new lookup table file. Download the addon to integrate into your splunk app for microsoft exchange or windows infrastructure deployment or use it to provide dns data to your own splunk app. This blog post is part fifteen of the hunting with splunk. Choose any endpoint on your organizations network, using nslookup, perform an a record lookup for. This is to track possible dns hijacking what i am doing is using the. Endpoint antimalware logs, dns lookup data and web surfing activity logs from proxy server. Splunk lookup the lookup command to invoke field value lookups. Some documentation that helps with configuring them. The lookup in the first search is faster because it only needs to match the results of the stats command and not all the web access events. All it requires is two advanced xml forms, sideview utils and a lookup table. Csv lookup files and csv lookup definitions are also dataset types. Below we will see how can we create splunk lookup step by step process to create splunk lookups.

Lookups enrich your event data by adding fieldvalue combinations from lookup tables. The definitive list of the top 10 dns monitoring tools and software for. Dns lookup data normalized to the network resolution cim data model. This wiki article will discuss a system that i created that allows the online and dynamic editing of lookup tables in the etcsystemlookups folder.