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Microsoft Attack Simulation Training Tenant Payload Upload Format

Maira Mehtab Sep 22, 2026 869 views

Question details

The user needs to know the correct file format and structure for uploading custom email content, including images, as tenant payloads in Microsoft Attack Simulation Training.

Product: Microsoft Defender
Device & OS: not provided
Scenario: Creating and uploading custom tenant payloads for email phishing simulations.
Observed behavior: The system accepts TXT files for custom tenant payloads, but it remains unclear how to correctly format the file to include email content and embedded pictures.

Before you start

Verify that you have the appropriate administrative permissions in Microsoft Defender for Office 365 to configure and run Attack Simulation Training.

Solution 1Recommended

Seek Assistance in the Microsoft Defender Community

Because Attack Simulation Training is a specialized IT security feature of Microsoft Defender rather than a standard Office application, formatting questions are best addressed by security specialists.

Attack Simulation Training configuration often involves strict parameters regarding HTML structure, image hosting, and payload delivery methods to bypass standard filters accurately.

To ensure your custom payload works successfully without breaking image links, consulting official Defender resources is highly recommended.

Visit the Microsoft Q&A Platform

Navigate to the official Microsoft Q&A website and search for the 'Microsoft Defender for Office 365' tag.

Post Your Payload Format Question

Create a new thread detailing your issue with TXT files and ask specifically about embedding images or alternative HTML payload formats supported by the simulation training.

Consult Microsoft Defender Documentation

Review the official Microsoft Learn documentation under 'Create a payload for Attack simulation training' for the latest formatting rules and supported file types.

Specialized Support Required: Issues regarding Microsoft Defender functionalities are typically not covered in general Office productivity forums. Specialized communities will provide much faster and more accurate resolutions.

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Frequently Asked Questions

Can I use HTML for Microsoft Attack Simulation payloads?

Yes, standard practice for custom email payloads involves HTML to allow for rich text editing, varied formatting, and the insertion of external image links. Check the payload creation wizard to see if there is a direct HTML input option rather than just TXT uploads.

Why are images not displaying in my Attack Simulation payload?

Images typically need to be hosted on external servers and referenced via absolute URLs within the payload's code. If you use embedded base64 images or local file paths in your TXT file, email clients may block or fail to render them.

Is Attack Simulation Training included in standard Microsoft 365?

No, Attack Simulation Training requires specific licensing. It is generally available for organizations with Microsoft Defender for Office 365 Plan 2 or those subscribed to Microsoft 365 E5, A5, or G5 plans.

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