Digital Shadow Plugin for Threat Exchange

This document explains how to configure Digital Shadow with the Threat Exchange module of the Netskope Cloud Exchange platform. This integration allows for pulling URLs (phishing-site-alert, impersonating-subdomain-alert and impersonating-domain-alert) from Digital Shadow to Netskope.

Prerequisites

To complete this configuration, you need:

A Netskope tenant (or multiple, for example, production and development/test instances) that is already configured in Cloud Exchange.
A Secure Web Gateway subscription for URL sharing.
A Netskope Cloud Exchange tenant with the Threat Exchange module already configured.
A Digital Shadow instance with the Elevate or Extend packages. Reach out to their Digital Shadow representative and ask them for API credentials (all keys granted as part of Elevate/Extend will have the required permissions).
The API key will be a 6-character letter/number combination (ex: ABCD1E). The API secret will be a 32-character letter/number combination (ex: ABCDEF12GHIJKL345MNO6PQRSTUVWXYZ.
Connectivity to the following host: https://api.searchlight.app/.

Digital Shadow Plugin Support

Fetched Indicator Types	Shared Indicator Types
URL	Not supported

Workflow

Create a custom File Profile.
Create a Malware Detection Profile.
Create a Real-time Protection Policy.
Create Digital Shadow credentials.
Configure the Digital Shadow Plugin.
Configure sharing between Netskope and Digital Shadow.
Validate the Digital Shadow Plugin.

Click here to watch a video.

Create a Secure Web Gateway Custom File Profile for Digital Shadow

In the Netskope UI, go to Policies , select File , and click New File Profile.
Click File Hash in the left panel, select SHA256 from the File Hash dropdown list.
Enter a temporary value in the text field. Netskope does not support progressing without having a value in this field, and recommends entering a string of 64 characters that consists of the character f. For example, ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff. This will have a very low possibility of matching a valid file format.
Click Next.
Enter a Profile Name and a Description. We recommend not having blank spaces in your profile name; use underscores for spaces.
Click Save.
To publish this profile into the tenant, click Apply Changes in the top right.

Create a Malware Detection Profile for Digital Shadow

In the Netskope UI, go to Policies, select Threat Protection , and click New Malware Detection Profile.
Click Next.
Note
For this configuration example, we will be using the intelligence for this list as a block list. Netskope does support inclusion of both allow and block lists in the threat profiles.
Click Next again.
Select the File Profile you created in the previous section and click Next.
Enter a Malware Detection Profile name and click Save Malware Detection Profile.
To publish this profile in the tenant, click Apply Changes in the top right.

Create a Real-time Threat Protection Policy for Digital Shadow

In the Netskope UI, go to Policies > Real-time Protection.
Note
The policy configured here is just an example. Modify as appropriate for your organization.
Click New Policy and select Threat Protection.
For Source, leave the default (User = All Users)
For Destination: select Category
The Category section expands and allows you to search and select categories. Click Select All.
When finished, click outside of the Category section.
When the Activities & Constraints section opens, click Edit.
Select Upload and Download, and then click Save.
For Profile & Action, click in the text field.
Select the Malware Detection profile you created in the previous section.
For the Severity Levels, change all of the Actions settings from Action: Alert to Action: Block.
Select a template to choose which block message is sent to the user.
For Set Policy, enter a descriptive Policy Name.
Click Save in the top right to save the policy.
Choose the To the top option when it appear. (Or appropriate location in your security policy)
To publish this policy into the tenant, select Apply Changes in the top right.

Get your Digital Shadow Credentials

To get your API Key, API Secret, and Searchlight Account ID from Digital Shadow platform, reach out to their Digital Shadow representative and ask them for API credentials (all keys granted as part of Elevate/Extend will have the required permissions).

The API key will be a 6-character letter/number combination (ex: ABCD1E). The API secret will be a 32-character letter/number combination (ex: ABCDEF12GHIJKL345MNO6PQRSTUVWXYZ.

Configure the Digital Shadow Plugin for Threat Exchange

In Cloud Exchange, go to Settings and click Plugins.
Search for and select the Digital Shadow box to open the plugin creation pages.
Enter and select the Basic Information on the first page:
- Configuration Name: Unique name for the configuration.
- Sync Interval: Leave default
- Aging Criteria: Expiry time of the plugin in days. Default is 90.
- Override Reputation: Set a value to override the reputation of indicators received from this configuration.
- Enable SSL Validation: Enable SSL Certificate validation.
- Use System Proxy: Enable if the proxy is required for communication.
Click Next.
Enter the Configuration Parameters on the second page:
- API Key: DigitalShadow API Key.
- API Secret: DigitalShadow API Secret.
- Searchlight Account ID: DigitalShadow Searchlight Account ID.
Click Save.

Configure Sharing for Netskope and Digital Shadow

Go to Threat Exchange and select Sharing. The Sharing page displays the existing relationships for each sharing configuration in grid view as shown below. The Sharing page also has inputs to configure new sharing from one plugin to another.
Click Add Sharing Configuration, and in the Source Configuration dropdown list, select Digital Shadow.
Select a Business Rule, and then select Netskope for the Destination Configuration. Sharing configurations are unidirectional. data obtained from one plugin is shared with another plugin. To achieve bi- or multi-directional sharing, configure each separately.
Select a Target. Each plugin will have a different target or destination for the IoC.
Click Save.
Repeat steps 2-5, but select Netskope as the Source Configuration and Digital Shadow as the Destination Configuration.
Click Save.

Adding a new sharing configuration on the active source poll will share the existing IoCs of the source configuration to the destination configuration. Whenever a new sharing configuration is built, all the active IoCs will also be considered for sharing if they match the source/destination combination.

Note

Plugins that do not have API for ingesting data cannot receive threat data. This is true of the installed plugin API Source, which provides a bucket associated with an API endpoint for remote 3rd-party systems to push data to. Once a Sharing policy has been added, it takes effect.

After a sharing configuration has been created, the sharing table will show the rule being invoked, the source system providing the potential IoC matches, the destination system that will receive matching IoC, and the target applicable to that rule. Multiple Sharing configurations can be made to support mapping certain IoC to multiple targets even on the system destination system.

Modify, Test, or Delete a Sharing Configuration

Each configuration supports 3 actions:

Edit the rule by clicking on the pencil icon.
Test the rule by clicking on the synchronization icon. This tests how many IoC will actually be sent to the destination system based on the timeframe and the rule.
Delete the rule by clicking on the garbage can icon.

Validate the Digital Shadow Plugin

Based on the Plugin configuration, Indicators will pull from Digital Shadow. Go to Threat Exchange > Threat IoCs to view the received IoCs.

Digital Shadow Plugin for Threat Exchange