The correct answer is the ASR rule "Block all Office applications from creating child processes" (GUID: D4F940AB-401B-4EFC-AADC-AD5F3C50688A). This rule directly prevents Word, Excel, and PowerPoint from spawning child processes like cmd.exe, PowerShell, or wscript.exe, which is a common malware technique where malicious code executes through Office macros or exploits. On the Microsoft 365 Administrator MS-102 exam, this question tests your understanding of attack surface reduction capabilities within Microsoft Defender for Endpoint, specifically how ASR rules block process injection and lateral movement without affecting legitimate Office functionality. A common trap is confusing this rule with similar ASR rules that block Office communication apps or scripts from launching child processes—remember, this one targets the core Office suite (Word, Excel, PowerPoint) specifically. Memory tip: think "Office as a parent" — if an Office app tries to be a parent to a command-line child, this rule says "no adoption allowed."
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. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 Microsoft Office applications (Word, Excel, PowerPoint) from creating child processes, which is a common technique used by malware to execute malicious code. Which attack surface reduction (ASR) rule should be enabled?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Block all Office applications from creating child processes
Option A is correct because the ASR rule 'Block all Office applications from creating child processes' (GUID: D4F940AB-401B-4EFC-AADC-AD5F3C50688A) specifically prevents Word, Excel, and PowerPoint from spawning child processes such as cmd.exe, PowerShell, or wscript.exe. This directly mitigates a common malware technique where Office macros or exploits launch malicious executables. The rule is part of Microsoft Defender for Endpoint's attack surface reduction capabilities and is designed to stop process injection and lateral movement without blocking legitimate Office functionality.
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.
✓
Block all Office applications from creating child processes
Why this is correct
This rule directly addresses the described behavior by blocking Office apps from creating child processes.
Related concept
Read the scenario before looking for a memorised answer.
✗
Block executable files from running unless they meet a prevalence, age, or trusted list criteria
Why it's wrong here
This rule targets executables based on prevalence or trust, not specifically Office child processes.
✗
Block Office applications from creating executable content
Why it's wrong here
This rule prevents Office apps from creating executable content (e.g., .exe files), not child processes.
✗
Block Win32 API calls from Office macros
Why it's wrong here
This rule blocks specific API calls from macros, not the creation of child processes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'creating child processes' with 'creating executable content' or 'blocking Win32 API calls,' leading them to choose options that address file writes or macro restrictions rather than the specific process spawning behavior.
Detailed technical explanation
How to think about this question
Under the hood, this ASR rule monitors process creation events via the Windows kernel's process creation callback (PsSetCreateProcessNotifyRoutine) and compares the parent process against a list of Office application image paths (e.g., WINWORD.EXE, EXCEL.EXE, POWERPNT.EXE). If a child process is created, the rule can block it or audit it depending on the configured mode. A real-world scenario is the Emotet malware, which uses Word macros to spawn PowerShell or cmd.exe to download payloads; enabling this rule stops that chain at the process creation stage.
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 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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. 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 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: Block all Office applications from creating child processes — Option A is correct because the ASR rule 'Block all Office applications from creating child processes' (GUID: D4F940AB-401B-4EFC-AADC-AD5F3C50688A) specifically prevents Word, Excel, and PowerPoint from spawning child processes such as cmd.exe, PowerShell, or wscript.exe. This directly mitigates a common malware technique where Office macros or exploits launch malicious executables. The rule is part of Microsoft Defender for Endpoint's attack surface reduction capabilities and is designed to stop process injection and lateral movement without blocking legitimate Office functionality.
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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