The correct answer is Safe Attachments, because this Microsoft Defender for Office 365 feature is specifically designed to perform sandbox detonation of email attachments before delivery. When a user receives an email, Safe Attachments routes the attachment to a virtual sandbox environment where it is opened and its behavior is analyzed for malicious activity, such as attempting to write to system files or contact command-and-control servers. Only if the attachment passes this behavioral check is the email released to the recipient’s inbox. On the SC-900 exam, this question tests your understanding of the distinct roles within Defender for Office 365—specifically that Safe Attachments handles pre-delivery malware analysis, while Safe Links focuses on URL scanning. A common trap is confusing Safe Attachments with anti-malware policies, which rely on signature-based detection rather than behavioral sandboxing. Remember: Safe Attachments = Sandbox Detonation; think “ASAP” (Attachments, Sandbox, Analyze, Protect).
SC-900 Practice Question: Describe the capabilities of Microsoft security solutions
This SC-900 practice question tests your understanding of describe the capabilities of microsoft security solutions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. A key principle to apply: safe Attachments detonates email attachments in a sandbox environment.. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A company uses Exchange Online. The security team wants to protect users from malicious email attachments. They need a solution that detonates attachments in a sandbox environment to check for malware behavior before the email is delivered to the recipient. Which Microsoft Defender for Office 365 feature should they enable?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Safe Attachments
Safe Attachments is the correct feature because it specifically detonates email attachments in a virtual sandbox environment before delivery, analyzing behavior for malicious activity. This matches the requirement to check attachments for malware behavior prior to inbox arrival, a capability unique to Safe Attachments within Defender for Office 365.
Key principle: Safe Attachments detonates email attachments in a sandbox environment.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Safe Attachments
Why this is correct
Safe Attachments uses a sandbox to detonate attachments and detect malware before delivery.
Related concept
Safe Attachments detonates email attachments in a sandbox environment.
✗
Safe Links
Why it's wrong here
Safe Links protects users by rewriting and checking URLs in emails, not attachments.
✗
Anti-phishing
Why it's wrong here
Anti-phishing policies protect against phishing attempts, not attachment-based malware.
✗
Anti-spam
Why it's wrong here
Anti-spam filters junk mail but does not sandbox attachments for malware detection.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse Safe Attachments (sandbox detonation of attachments) with Safe Links (URL scanning at click-time), as both are part of Defender for Office 365 but address different threat vectors.
Detailed technical explanation
How to think about this question
Safe Attachments uses a hypervisor-based sandbox that executes the attachment in a controlled environment, monitoring for file system changes, registry modifications, and network callbacks. This dynamic analysis catches zero-day malware that static signature-based scanning would miss. In a real-world scenario, a PDF with embedded JavaScript would be detonated in the sandbox to observe if it attempts to download a payload, and if malicious, the email is either quarantined or the attachment is replaced with a warning placeholder.
KKey Concepts to Remember
Safe Attachments detonates email attachments in a sandbox environment.
It performs behavioral analysis to detect malware before delivery.
Part of Microsoft Defender for Office 365.
Protects against zero-day and polymorphic attachment-based threats.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Safe Attachments detonates email attachments in a sandbox environment.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Safe Attachments detonates email attachments in a sandbox environment. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SC-900 question in full detail.
Review safe Attachments detonates email attachments in a sandbox environment., then practise related SC-900 questions on the same topic to reinforce the concept.
Describe the capabilities of Microsoft security solutions — This question tests Describe the capabilities of Microsoft security solutions — Safe Attachments detonates email attachments in a sandbox environment..
What is the correct answer to this question?
The correct answer is: Safe Attachments — Safe Attachments is the correct feature because it specifically detonates email attachments in a virtual sandbox environment before delivery, analyzing behavior for malicious activity. This matches the requirement to check attachments for malware behavior prior to inbox arrival, a capability unique to Safe Attachments within Defender for Office 365.
What should I do if I get this SC-900 question wrong?
Review safe Attachments detonates email attachments in a sandbox environment., then practise related SC-900 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
Safe Attachments detonates email attachments in a sandbox environment.
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company uses Exchange Online. The security team wants to protect users from malware hidden in email attachments by detonating them in a secure sandbox environment before delivery. Which Microsoft Defender for Office 365 feature should they enable?
medium
A.Safe Links
✓ B.Safe Attachments
C.Anti-Phishing
D.Anti-Spoofing
Why B: Safe Attachments is the correct feature because it specifically detonates email attachments in a secure, isolated sandbox environment to detect and block malware before the message reaches the user's inbox. This feature uses dynamic analysis to observe attachment behavior in real time, ensuring zero-day threats are identified and neutralized.
Variation 2. A company uses Microsoft 365 and wants to protect users from malicious attachments in email. The security team wants a solution that detonates attachments in a sandbox environment before delivery, and only allows the email through if the attachment is deemed safe. Which Microsoft security solution should they use?
medium
✓ A.Microsoft Defender for Office 365
B.Microsoft Defender for Endpoint
C.Microsoft Defender for Cloud Apps
D.Azure Firewall
Why A: Microsoft Defender for Office 365 includes Safe Attachments, a feature that detonates email attachments in a virtual sandbox environment before delivery. It analyzes the attachment's behavior for malicious activity and only releases the email to the recipient's mailbox if the attachment is deemed safe, directly meeting the requirement for pre-delivery sandboxing.
Last reviewed: Jun 11, 2026
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