The correct answer is Attack Surface Reduction (ASR) rules, as these are the specific Microsoft Defender for Endpoint feature designed to block common malware techniques like preventing Office applications from creating child processes and blocking executable files from running from the %TEMP% folder. ASR rules work by enforcing granular, behavior-based policies at the process level, targeting suspicious actions such as Office child processes or script execution from temporary directories, thereby reducing the attack surface without relying solely on signature-based detection. On the SC-900 exam, this concept tests your understanding of how Microsoft Defender for Endpoint’s built-in controls mitigate real-world threats, often appearing in scenario-based questions where you must distinguish ASR rules from other features like attack surface reduction itself or Windows Defender Firewall. A common trap is confusing ASR rules with broader attack surface reduction concepts, but remember: ASR rules are the specific, configurable policies that block behaviors like Office child processes and %TEMP% execution. Memory tip: think “ASR blocks the bad habits” — Office spawning kids and Temp running scripts are the two classic examples.
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. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. 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 wants to reduce the attack surface on its Windows devices by blocking common techniques used by malware, such as preventing Office applications from creating child processes or blocking executable files from running from the %TEMP% folder. Which Microsoft Defender for Endpoint feature should be configured?
Why wrong: Antivirus detects and removes known malware but does not block behaviors like Office creating child processes or execution from %TEMP%.
B
Attack surface reduction rules
These rules target specific malware techniques, such as blocking Office applications from creating child processes and blocking executable files from running from common temporary folders.
C
Network protection
Why wrong: Network protection prevents connections to malicious IPs or domains, not local process behaviors.
D
Controlled folder access
Why wrong: Controlled folder access protects files in specified folders from ransomware and other unauthorized changes, but does not block the described process behaviors.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Attack surface reduction rules
Attack surface reduction (ASR) rules are a feature of Microsoft Defender for Endpoint that specifically target common malware behaviors, such as blocking Office applications from creating child processes and preventing executable files from running from the %TEMP% folder. These rules are designed to reduce the attack surface by enforcing policies that stop suspicious or malicious actions at the process level, without relying solely on signature-based detection.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Microsoft Defender Antivirus
Why it's wrong here
Antivirus detects and removes known malware but does not block behaviors like Office creating child processes or execution from %TEMP%.
✓
Attack surface reduction rules
Why this is correct
These rules target specific malware techniques, such as blocking Office applications from creating child processes and blocking executable files from running from common temporary folders.
Related concept
Read the scenario before looking for a memorised answer.
✗
Network protection
Why it's wrong here
Network protection prevents connections to malicious IPs or domains, not local process behaviors.
✗
Controlled folder access
Why it's wrong here
Controlled folder access protects files in specified folders from ransomware and other unauthorized changes, but does not block the described process behaviors.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Attack surface reduction rules with Microsoft Defender Antivirus or Controlled folder access, assuming that any 'blocking' feature is part of the antivirus or that folder protection covers execution, when in fact ASR rules are the only feature that enforces behavior-based policies on process creation and execution from specific locations.
Detailed technical explanation
How to think about this question
ASR rules are implemented as Group Policy Objects or via Microsoft Intune and are evaluated by the Windows Defender Advanced Threat Protection (WDATP) service at the kernel level. Each rule corresponds to a specific GUID (e.g., 'Block Office applications from creating child processes' uses GUID D4F940AB-401B-4EFC-AADC-AD5F3C50688A), and they can be configured in audit mode for testing before enforcement. In a real-world scenario, an attacker might use a malicious macro in Word to spawn PowerShell.exe from %TEMP%; an ASR rule would block that process creation immediately, whereas traditional antivirus might miss it if the payload is fileless or obfuscated.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SC-900 question in full detail.
Describe the capabilities of Microsoft security solutions — This question tests Describe the capabilities of Microsoft security solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Attack surface reduction rules — Attack surface reduction (ASR) rules are a feature of Microsoft Defender for Endpoint that specifically target common malware behaviors, such as blocking Office applications from creating child processes and preventing executable files from running from the %TEMP% folder. These rules are designed to reduce the attack surface by enforcing policies that stop suspicious or malicious actions at the process level, without relying solely on signature-based detection.
What should I do if I get this SC-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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