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Getwatchlist Add-on for Splunk Enterprise

Overview
Details
Getwatchlist is a custom search command for Splunk which will return a CSV formatted list from a URL. This is useful for creating lookup tables and keeping them up to date from external or internal sources. These watchlists can contain virtually anything such as domain names, IP addresses, host names, email addresses, filenames, etc. and can then be used in searches against your events. These watchlists can be in any delimited format (tab, comma, space, etc.).

NOTE: If you were using a previous version, please make sure to read about the changes in the configuration file locations, and backup any custom configurations you may have prior to upgrading!

Requirements

This custom command has been tested on Splunk 5 and higher. If you want to pull down lists off of the internet, your search head will need to have internet access.

Installation

To install, copy the downloaded tarball to the SPLUNK_HOME/etc/apps directory and expand. This will create a directory named getwatchlist which contains the sample configuration file, the command.conf to enable the command, as well as permissions to enable usage of the command globally in Splunk. Splunk will need to be restarted for the new application and configuration to take.

Usage

Options for getwatchlist can be supplied via the search options passed in the search box, a configuration file, or a combination of the two.

The first argument passed to getwatchlist is the URL of the watchlist or the name of a profile in the configuration file. If a profile exists, it will be loaded first, and then options passed via the search command will be used to overwrite the stored settings.

Options are passed in a "key=value" fashion. Arguments that are passed and are not known arguments will be appended as custom fields. So if I add a field of:
spam=tasty
Each line of the CSV which is returned will have a column named "spam", with a value of "tasty".

If there are additional columns in the list which you would like to be output as well, you can tell the command which column, and what the name if it should be. To do this, use an integer (the column number you would like to include), and give it a name for the column. To to include column 3 of a list, and name the column "enddate", you would add:
3=enddate
To your command parameters or configuration.

Here are options which can be passed, or used in the configuration file:

categoryCol: The column number of any category field in the fetched file.

comment (default: #): The character which is used to denote a commented out line .

dateCol: The column number of any date field in the file which you would like to use for reference.

delimiter (default: \t): The delimiter field of the fetched file .

ignoreFirstLine (default: False): Some watchlists contain a header which is not commented out. If this is set to "True" this line
will be ignored.

relevantFieldCol (default: 1): The column number (starting at 1) which contains the key value you would like to use .

relevantFieldName (default: ip_address): What you would like the field to be named in the CSV output (not the name in the fetched CSV) .

referenceCol: The column number of any reference field in the fetched CSV.

url: The URL of the file to be retrieved (HTTP, HTTPS or FTP).

authUser: Username to use for authentication (HTTP Basic or FTP)

authPassword: Password to use for authentication (HTTP Basic or FTP)

proxyHost: Hostname or IP of the HTTP proxy to be used for HTTP and HTTPS connections

proxyPort: Port for the HTTP proxy

Configuration File

Configurations are kept in files named getwatchlist.conf. An example of this file is in the /default/ directory of the application. It contains example profiles which are ready to use.

Any custom configuration items in the /local/ version of the .conf file will override or add on to any settings in the /default/ file, much like normal Splunk configuration.

Additionally, settings entered via the search command will override both the /default/ and /local/ settings.

The "globals" section of the configuration file can be used for proxy configuration. By using the globals section, the command will use those settings by default, but can be overridden using command or profile settings.

Examples

Splunk Searches to output a watchlist

Malware Domains
| getwatchlist <http: mirror1.malwaredomains.com="" files="" domains.txt=""> relevantFieldName="domain" relevantFieldCol=3 categoryCol=4 referenceCol=5 dateCol=6 isbad=true

Zeus tracker IP list
| getwatchlist <http: www.abuse.ch="" zeustracker="" blocklist.php?download="ipblocklist">

DShield recommended block list
| getwatchlist <http: feeds.dshield.org="" block.txt=""> relevantFieldName='rangestart' ignoreFirstLine=True referenceCol=5

Spamhaus DROP list
|getwatchlist <http: www.spamhaus.org="" drop="" drop.lasso=""> delimiter=; relevantFieldName='sourceRange' relevantFieldCol=1 referenceCol=2 ignoreFirstLine=True

Configuration File Examples

Examples can be found in the /default/getwatchlist.conf

Splunk Searches using saved lookups

Using a subsearch from the CSV: index="webproxy" [|inputlookup phishtank.csv | fields uri]
Using a configured lookup: index="webproxy" | lookup phishtank uri | search isbad=true

Release Notes

Version 1.0
Aug. 16, 2011

Added:
- Better error handling and output in Splunk
- The ability to add values from other columns in the fetched list.
Changed:
- The configuration file has been made more Splunk-like. An example file is in /default/ and custom profiles or configs can be added to a getwatchlist.conf in the /local/ directory.
- The URL for Malware Domains has been updated as from 8/1/11 the domains.txt file will only be available from mirrors
Security:
- Note that a potential security vulnerability was found in version 0.7. Users are urged to update.

Version 0.9
May 23, 2011

Added:
Support for proxies (proxyHost, proxyPort)
Support for HTTP and FTP authentication (authUser, authPass)
Changed:
Changed to urllib2 from urllib
Update configuration file examples
Fixed:
Bug causing case sensitivity in search command parameters

Version 0.7
May 11, 2011

First public release.

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Installs
2,369
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