Block IPs and Domains from Alerts in Umbrella

Workflow #0016

This workflow fetches alerts from Cisco Secure Cloud Analytics (SCA) for the past 24 hours based on the alert name and status provided. Observations are extracted from the alerts and their associated IPs, domain names, and URLs are logged. Each IP address, domain name, and URL is then added to a destination list in Cisco Umbrella (depending on workflow configuration). Finally, a Webex message is sent with a summary.

GitHub

Change Log

Date	Notes
Apr 1, 2021	- Initial release
Sep 10, 2021	- Updated to use the new system atomics
Aug 31, 2022	- Minor updates to naming and descriptions
Feb 23, 2023	- Update to `Secure Cloud Analytics API Key` variable description (Issue #235)

See the Important Notes page for more information about updating workflows

Requirements

The following system atomics are used by this workflow:
- Secure Cloud Analytics - Get Alerts
- Secure Cloud Analytics - Get Observation Details by ID
- Umbrella - Management - Add Record to Destination List
- Umbrella - Management - Get Destination Lists
- Webex - Post Message to Room
- Webex - Search for Room
The following atomic actions must be imported before you can import this workflow:
- None
The targets and account keys listed at the bottom of the page
Cisco Secure Cloud Analytics (SCA)
Cisco Umbrella
(Optional) Cisco Webex

Workflow Steps

(Optional) Fetch global variables
Make sure at least one destination list was provided
Calculate dates
Fetch alerts from Secure Cloud Analytics
Extract observations from the alerts
Set up a table for IPs and a table for domains
For each observation:
- Fetch the observation’s details
- Parallel block:
  - IP branches (Parse IP address, Parse external IP address, Parse connected IP address)
    - Attempt to extract an IP from the observation:
      - If an IP is found:
        
        Attempt to perform a reverse DNS lookup:
        
        If the lookup is successful, add the domain to the domain table (if it isn’t already in the table)
        
        If the lookup fails, add the IP to the IP table (if it isn’t already in the table)
  - Domain/URL branches (Parse domain, Parse hostname, Parse URL)
    - Attempt to extract a domain from the observation:
      - If a domain is found, add it to the domain table (if it isn’t already in the table)
Fetch a list of destination lists from Umbrella
Attempt to fetch the ID of the destination list for IPs
- If the destination list was found:
  - Loop through each IP adding them to the list and recording whether or not adding was successful
- If the destination list was not found, make a note in the workflow output
Attempt to fetch the ID of the destination list for domains
- If the destination list was found:
  - Loop through each domain adding them to the list and recording whether or not adding was successful
- If the destination list was not found, make a note in the workflow output
Send a Webex message with a summary

Configuration

Set the Secure Cloud Analytics Alert Name local variable to the name of the alert type you want to respond to
Set the Secure Cloud Analytics Alert Status local variable to the alert status you want to response to
Add your Secure Cloud Analytics API key to the Secure Cloud Analytics API Key local variable (or, if you have an API key in a global variable already, set the local variable to the global’s value using the Fetch Global Variables group at the beginning of the workflow)
Set the Umbrella Domain Destination List local variable to the name of the destination list you want domains added to
Set the Umbrella IP Destination List local variable to the name of the destination list you want IP addresses added to
Set the Umbrella Organization ID local variable to your Umbrella organization’s ID (found in your Umbrella dashboard’s URL)
See this page for information on configuring the workflow for Webex

Targets

Target Group: Default TargetGroup

Target Name	Type	Details	Account Keys	Notes
Secure Cloud Analytics	HTTP Endpoint	Protocol: `HTTPS` Host: `your-tenant.obsrvbl.com` Path: `api`	None
Umbrella Management	HTTP Endpoint	Protocol: `HTTPS` Host: `management.api.umbrella.com` Path: None	Umbrella Management
Webex Teams	HTTP Endpoint	Protocol: `HTTPS` Host: `webexapis.com` Path: None	None	Not necessary if Webex activities are removed

Account Keys

Account Key Name	Type	Details	Notes
Umbrella Management	HTTP Basic Authentication	Username: Client ID Password: Client Secret	Must be an API client for the management API