Decider

Decider is a tool to help analysts map adversary behavior to MITRE ATT&CK, NIST and ACSC ISM frameworks. Decider makes creating mappings between various cyber security frameworks easier to get right by walking users through the mapping process. It does so by asking a series of guided questions about adversary activity to help them arrive at the correct tactic, technique, or subtechnique. Decider has a powerful search and filter functionality that enables users to focus on the parts of ATT&CK that are relevant to their analysis. Decider also has a cart functionality that lets users export results to commonly used formats, such as tables and ATT&CK Navigator heatmaps.

This work is licensed under a Creative Commons Attribution 4.0 International License.
This project makes use of MITRE ATT&CK® - ATT&CK Terms of Use.

User Guide

• Guide in Markdown
• Guide in HTML

Note: The MD can be viewed directly on GitHub, while the HTML must be downloaded for local viewing. The MD will appear slightly weird - as it contains Pandoc directives used in generating the HTML.

Intended Purpose

Decider ultimately tries to make mapping to ATT&CK easier.

It offers:

• A question tree with pagination of results (structures your progress)
• Technique search + filtering options
• Suggestions of other techniques that may have occurred

Decider does not intend to replace the ATT&CK site - but rather, it acts as a complementary tool that leads you there in the end. Only information assisting mapping is included.

Installation

Docker

git clone https://github.com/cisagov/decider.git
cd decider
cp .env.docker .env
# edit .env - define DB_ADMIN_PASS, DB_KIOSK_PASS, CART_ENC_KEY, APP_ADMIN_PASS
# no default passwords are given :)
cp -r default_config/. config/
sudo docker compose up

Then visit the link once started (default: http://localhost:8001/).

Config Made Easy

Changing config/? Just:

sudo docker compose stop
sudo docker compose start

However, changing variables in .env requires

sudo docker compose up

which will recreate containers with modified environments

HTTPS / URL

Endpoint Determination (.env vars):

• WEB_HTTPS_ON='' -> http://`WEB_IP`:`WEB_PORT`/
• WEB_HTTPS_ON='anything' -> https://`WEB_IP`:`WEB_PORT`/

HTTPS Cert Location

• Write these 2 files to set SSL up:
  • config/certs/decider.key
  • config/certs/decider.crt
• If either file is missing, a self-signed cert is generated and used instead

Manual Install

Instructions out of date

• Docker is the preferred method of install
• The manual install instructions require adjustments if followed
  • You need Python 3.12+ (instructions mention Python 3.8.16, which will not work :warning:)
  • You may need PostgreSQL 16 (instructions mention PostgreSQL 12+, which should work)

Ubuntu 22.04

Ubuntu Install Guide

CentOS 7

CentOS Install Guide

Pip Requirements Note

For Everyone

pip install -r requirements-pre.txt
pip install -r requirements.txt

For Developers

pip install -r requirements-dev.txt
pre-commit install

Other OSes

Read the Ubuntu & CentOS guides and recreate actions according to your platform.

Windows

open() in Python uses the system's default text encoding

• This is utf-8 on macOS and Linux
• This is windows-1252 on Windows
  • This causes issues in reading the jsons for the database build process
  • Adding encoding='utf-8' as an arg in each open() may allow Windows deployment

macOS

(M1 users at least) Make sure to (1) install Postgres before (2, 3) installing the pip requirements

1. brew install postgresql
2. pip install -r requirements-pre.txt
3. pip install -r requirements.txt

Requirements

as of April 24th, 2023

Software

Docker

Exact required version(s) unspecified.

• An up-to-date version of Docker and Docker Compose should be used.
• docker compose should work, whereas docker-compose is outdated.

Manual

• Operating System
  • CentOS 7+
  • Ubuntu 22.04.2+
  • Fedora 37+ works fine (earlier versions should work too)
• Python 3.12+ (instructions mention Python 3.8.16, which will not work :warning:)
• PostgreSQL 16 (instructions mention PostgreSQL 12+, which should work)

Hardware

Suggested Specs

• 1-2 Cores
• 1-2 GB Memory
• 20 GB Disk Space

Decider has not yet been tested against many concurrent users (this is soon to change).
But it is extremely lightweight - it sits at roughly 250MB of RAM total for both containers (docker stats).
It does peak during the build process where sources are loaded into RAM, hitting 375MB or so.

Appendix A: Updating ATT&CK Content on Decider 1/2

Docker Update Instructions

# (in repo root)

# pull v13 content
git pull

# remove containers (DB data is safe)
sudo docker compose down

# rebuild images (v13 files copy-over)
sudo docker compose up --build

# add version
sudo docker exec decider-web python -m app.utils.db.actions.add_version --config DefaultConfig --version v13.0

Manual Update Instructions

# (install root, same as repo root, contains app/ folder)
cd /opt/decider/1.0.0

# use decider app-user, with app venv, for add_version script
sudo -u decider -g decider /opt/decider/python3.8.10/bin/python3.8 -m app.utils.db.actions.add_version --config DefaultConfig --version v13.0