Creating Your Own CTI Aggregator for Free: A Complete Guide

Creating Your Own CTI Aggregator for Free: A Complete Guide

Cyber threat intelligence (CTI) involves gathering, analyzing, and understanding information about cyber security threats. To do this effectively, you need to use a CTI aggregator to harness the power of automation and strife to achieve the single pane of glass principle of cyber security architecture. 

This article will teach you what a CTI aggregator is, why you need one, and how to create your own for free! You will see how you can use and configure the popular news aggregation tool Feedly to create a custom CTI aggregator to add efficiency to your threat intelligence pipeline. 

Let’s begin elevating our threat intelligence processes and build out our very own CTI aggregator!

What is a CTI Aggregator?

You have probably heard of or used a news feed aggregator. These applications collect news articles from various sources and display them in a single pane of glass you can scroll through. Social media platforms, like X (formerly Twitter), can be seen as aggregators. They collect news and life stories from people you follow. There are also more conventional news aggregators like Feedly, which you can configure to collect articles from specific news outlets using RSS feeds. 

A Cyber Threat Intelligence (CTI) aggregator is just like a news feed aggregator, only it collects news specific to threat intelligence and puts it in one place. These could be articles describing the latest vulnerability, a novel tactic/technique/procedure (TTP) a threat actor is using, trends in the ransomware scene, or anything else that constitutes strategic, operational, or tactical.

To learn about the different types of threat intelligence and how they are used, read Threat Intelligence vs Threat Hunting: What is the Perfect Pipeline?

Why Do I Need a CTI Aggregator?

An important principle to follow (or at least to try to follow) when architecting cyber security systems or designing processes is the single pane of glass principle. Following this principle, you should aim to create a platform that contains all the alerts, incidents, and cases your 

SOC analysts, incident responders, and other defenders must monitor and respond to. An analyst should be able to log in to this platform and see all the cases they need to triage, analyze, and respond to based on the threats your organization faces. 

Security Orchestration, Automation, and Response (SOAR) solutions are designed to make this single pane of glass principle possible. Security solutions (EDRs, SIEMs, WAFs, etc.) feed their data into a SOAR, which processes this data and performs automated triage and enrichment to additional context to alerts or incidents. An analyst then logs into the SOAR solution to manage cases and triggers responses using the connected security solutions APIs to respond to threats rapidly.

Like a SOC analyst, a CTI analyst needs to inspect a range of sources to gather data they need to triage, analyze, and distribute. A CTI aggregator follows this single pane of glass principle by collecting and collating all the CTI sources you need to check into a single screen that you can scroll through. It saves you from manually collecting new threat intelligence and speeds up the threat intelligence lifecycle.

Learn more about what a CTI analyst does and the threat intelligence lifecycle in Day in the Life of a Senior Threat Intelligence Analyst.

The Tools Available for Creating a CTI Aggregator

Now you know what a CTI aggregator is and why you need one, you are probably wondering: “How do I get my hands on a CTI aggregator?”

You have two options:

  1. You can buy access to a Threat Intelligence Platform (TIP). This paid-for cyber threat intelligence tool collects, analyzes, and shares information about potential cyber security threats and is provided by a commercial CTI vendor. They are great for getting the intelligence specific to your organization.
  2. You can build your own for free using a news aggregator like Feedly or Inoreader. This a great option for making the most of free and open-source threat intelligence.

In this article, I assume you don’t have thousands to spend on a TIP, so I will show you how to build your own CTI aggregator using Feedly completely for free. Let’s begin!

How to Create a CTI Aggregator with Feedly

First, sign up to Feedly and click Get Started to create an account.

Welcome to Feedly Screen

Next, select the Personal News Reader option when creating your account (ignore Intelligence Platform for now – this is a paid feature you will learn more about later).

Selecting Using Feedly as a Personal News Reader

Select the Monitor cyber threats option when asked about your initial goal for using Feedly.

Selecting Using Feedly to Monitory Cyber Threats

This will bring you to the main Feedly dashboard, where you can begin configuring Feedly into a CTI aggregator.

To begin, click the Create a Folder button in the left pane. This is where you will store all your threat intelligence information. Creating folders based on what news they are aggregating is a good way to keep organized. You could have a folder for threat hunting ideas, interesting tools, or cute pictures of puppies. 

Name your new folder and click Save.

Creating a New Folder in Feedly

This will bring you to your folder’s default screen. Here, you can begin adding threat intelligence sources to your folder. Feedly will pull articles from these sources and populate the folder with this data. Click the Follow Website button to add a threat intelligence source to pull data from.

Next, search for the threat intelligence source you want to pull CTI articles from using the search bar. This could be the name of the source, an RSS link, or a topic. Here, I have searched for Mandiant (a popular CTI provider). 

The top match looks like a good one. To add it as a threat intelligence source, click the Follow button, hover over your Cyber Threat Intelligence folder, and click Add.

This will add Mandiant as a source to our Cyber Threat Intelligence folder. Whenever a new threat intelligence article is added to the Mandiant blog, Feedly will automatically pull this article to our Cyber Threat Intelligence folder for you to read. 

If you click on the Cyber Threat Intelligence folder, you will see a list of articles Feedly has already pulled down from the Mandiant blog for you to read. 

You can click on an article to read it or hover over it and use one of the tool icons.

From left to right, these include:

  • Read Later: Save the article to the Read Later folder (top left of the interface).
  • Save to Board: Feedly lets you create Boards to save similar or interesting articles. You can then share these boards with other users (work colleagues) for collaboration and knowledge sharing. Create a board and then click this button to add an article to it.
  • Mark as Read: This button marks an article as read so you can keep track of what articles you have already looked at in Feedly. It also shades out the article so you can quickly see what articles are still to read.
  • Mark as Read and Hide: This button marks an article as read and removes it from your article feed. 

To make your Cyber Threat Intelligence folder more comprehensive, add more threat intelligence sources. To do this, click on the Explore button (right side pane) or the Follow button (left side menu).

Now, just repeat the process of searching for and adding a CTI provider. This could be a website, blog, Twitter user, Reddit channel, or even a newsletter! 

Cyber Threat Intelligence Sources to Add

To help you start your CTI journey, here is a list of threat intelligence sources I have added to my CTI aggregator. Feedly pulls from all these sources and groups them by date in my Cyber Threat Intelligence folder. I just need to log in to Feedly and review the articles to keep up-to-date with all the latest threat intelligence news provided by the wonderful people who contribute to the open-source CTI community.

List of free and open-source CTI sources to add to your CTI aggregator tool:

  • Mandiant
  • Sekioa.io
  • AlienVault OTX
  • CISA Alerts
  • Cisco Talos Blog
  • Cyble Research Blog
  • IBM X-Force Exchange
  • Microsoft Security Intelligence
  • NCSC Weekly Threat Reports
  • Red Canary Blog
  • RiskIQ Community Edition
  • Trend Micro Research Blog
  • Palo Alto Networks Unit 42 Blog

Feedly’s Paid Option

You may have seen that some articles have tags associated with them, such as IoC, TTPs, and Threat Intelligence.

These tags are part of Feedly’s paid Threat Intelligence feature. This feature uses AI to automatically search through articles, extract data (IOCs, TTPs, CVEs, etc.), and display these to you. It also filters out duplicates, prioritizes articles from reputable sources or that have a lot of traction, and much more. 

Feedly’s threat intelligence is very good and a great tool for an enterprise-level CTI team to use. However, it is very expensive, and you can still use Feedly as a CTI aggregator without adding on this paid feature. You won’t get all the fancy AI automation and will be limited to three folders and 100 feeds, but this should be all you need.

You can choose to upgrade to Pro or Pro+ and get additional Feedly features, such as more feeds, better search options, no advertisements, etc., without upgrading to the Enterprise tier. The help you filter for intelligence that is more specific to your organization, and it is worth investigating this option if you intend to use Feedly professionally and outside of work regularly.

Summary

Cyber threat intelligence aggregators are incredible tools that add efficiency to your threat intelligence gathering and analysis process through the power of automation. You have learned what a CTI aggregator is and how to create your own one for free using Feedly. 

That said, Feedly is one of many options on the market. Another great alternative news aggregator you can use to create a free CTI aggregator tool is Inoreader. This is very similar to Feedly but provides a cleaner interface, better pricing options for individual users, and less pushy about upgrading to paid features. If you find Feedly annoying, then be sure to check out Inoreader.

Whatever CTI aggregator option you choose, a commercial TIP, Feedly, or Inoreader, you now have the knowledge and power to create and use one effectively. I highly recommend adding one to your threat intelligence pipeline to enhance your team’s capabilities.

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