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Supporting add-on for Open Threat Exchange

Overview
Details
This app integrates the threat data collected by the add-on for Open Threat Exchange (TA-otx) into the Splunk ES threat intelligence system

Supporting add-on for Open Threat Exchange

For reporting issues, please visit: https://github.com/lukemonahan/SA-otx

This app integrates OTX indicators collected by TA-otx into the Splunk Enterprise Security threat intelligence framework.

It does this within a modular input otx_intel_manager which periodically reads the data that has been collected by TA-otx and pushes it into the threat collections in a correctly structured manner.

Requirements

  • TA-otx -- This needs to be collecting OTX data, but there is not a requirement for this add-on on the Splunk ES search head
  • Splunk for Enterprise Security

Important: This add-on probably will not work well if your ES is deployed to a search head cluster, as the modular input will run at the same time on multiple search heads and cause race conditions. A future update will address search head clustering.

Setup

To set up this app after install:
1. Ensure that you have OTX data collected by TA-otx and it is fully backfilled to where you want it
1. Enable the otx_intel_manager://default modular input

The first backfill may take some time and can use CPU on your ES search head, depending upon how many OTX indicators you have indexed and are backfilling.

Field mapping

Currently evaluated indicator types from OTX are:

  • domain
  • hostname
  • email
  • FileHash-*
  • URL
  • IPv4
  • IPv6
  • CIDR

These map to threat intel groups and fields in Splunk ES according to the mapping that can be found in bin/otx_intel_manager.py (search for the type_mappings function)

Other field mappings that are important:

  • A concatenation of OTX tags, targeted industries and targeted countries map to threat_category
  • OTX adversary maps to threat_group
  • The description in the Splunk threat_group_intel collection is composed of both the pulse name and description from OTX
  • The source_path is the URL to view the pulse in detail in OTX

Expiration

There are a set of disabled saved searches called OTX <intel collection=""> - Retention included. When enabled, these will run overnight and remove any indicator older than 365 days. The exact length of retention can be tuned by modifying the otx_threat_expiry macro.

Release Notes

Version 1.0.0
Dec. 31, 2018

Initial release

18
Installs
53
Downloads
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