The answer is Attack Surface Reduction (ASR) rules, a Microsoft Defender for Endpoint capability that directly blocks Office macros from creating child processes. This rule, identified by GUID 26190899-1602-49e8-8b27-eb1d0a1ce869, prevents Excel, Word, and PowerPoint from spawning executables like cmd.exe or powershell.exe, thereby stopping malware that uses macros to launch secondary payloads. On the MS-102 exam, this scenario tests your understanding of ASR rules as a behavior-based mitigation within the broader Defender for Endpoint suite, often appearing as a distractor against options like Windows Defender Firewall or AppLocker. A common trap is confusing ASR rules with Controlled Folder Access; remember that ASR targets process creation, not file protection. For a quick memory tip, think “ASR blocks the spawn” — if an Office app tries to birth a child process, ASR kills it.
MS-102 Practice Question: Manage security and threats by using Microsoft Defender XDR
This MS-102 practice question tests your understanding of manage security and threats by using microsoft defender xdr. 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 security administrator wants to prevent malware from using Office macros to spawn malicious processes. Specifically, they want to block Excel, Word, and PowerPoint from creating child processes. Which Microsoft Defender for Endpoint capability should be configured?
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 (ASR) rules
Attack Surface Reduction (ASR) rules are a Microsoft Defender for Endpoint capability specifically designed to block common malware behaviors, such as Office applications (Excel, Word, PowerPoint) from creating child processes. This rule (GUID: 26190899-1602-49e8-8b27-eb1d0a1ce869) prevents macros from spawning cmd.exe, powershell.exe, or other executables, directly addressing the administrator's requirement.
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.
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Threat & Vulnerability Management
Why it's wrong here
TVM identifies vulnerabilities, not blocks.
✓
Attack Surface Reduction (ASR) rules
Why this is correct
ASR rules are designed to block specific common attack techniques like Office apps spawning child processes.
Related concept
Read the scenario before looking for a memorised answer.
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Web Protection
Why it's wrong here
Web Protection blocks browsing to malicious sites, not process creation.
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Network Protection
Why it's wrong here
Network Protection prevents connections to malicious IPs/domains, not process creation.
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 other Defender for Endpoint capabilities like Network Protection or Web Protection, mistakenly thinking that blocking network traffic is equivalent to blocking local process creation, when ASR rules are the only option that directly controls child process spawning from Office apps.
Detailed technical explanation
How to think about this question
ASR rules operate via Windows Defender Antivirus (Microsoft Defender AV) and are enforced at the kernel level using Event Tracing for Windows (ETW) and the Microsoft Malware Protection Engine. The specific rule 'Block Office applications from creating child processes' uses a GUID-based configuration that can be deployed via Group Policy, Intune, or PowerShell (e.g., `Set-MpPreference -AttackSurfaceReductionRules_Ids`). In real-world scenarios, this rule is critical for stopping macro-based ransomware like Emotet or Dridex, which rely on Word or Excel spawning PowerShell to download payloads.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this MS-102 question in full detail.
Manage security and threats by using Microsoft Defender XDR — This question tests Manage security and threats by using Microsoft Defender XDR — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Attack Surface Reduction (ASR) rules — Attack Surface Reduction (ASR) rules are a Microsoft Defender for Endpoint capability specifically designed to block common malware behaviors, such as Office applications (Excel, Word, PowerPoint) from creating child processes. This rule (GUID: 26190899-1602-49e8-8b27-eb1d0a1ce869) prevents macros from spawning cmd.exe, powershell.exe, or other executables, directly addressing the administrator's requirement.
What should I do if I get this MS-102 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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Question Discussion
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