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 needs to block users from running portable executable files (e.g., .exe, .scr) that were downloaded from the internet on Windows devices. Which Attack Surface Reduction (ASR) rule should the administrator enable to meet this requirement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Block executable files from running unless they meet a prevalence, age, or trusted list criterion
Option A is correct because the ASR rule 'Block executable files from running unless they meet a prevalence, age, or trusted list criterion' (GUID: 01443614-cd74-433a-b99e-2ecdc07bfc25) specifically targets executable files (e.g., .exe, .scr) that have been downloaded from the internet by checking their Mark-of-the-Web (MoTW) attribute. When enabled, this rule prevents execution of such files unless they meet criteria like high prevalence, sufficient age, or inclusion in a trusted list, directly addressing the requirement to block internet-downloaded portable executables.
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 executable files from running unless they meet a prevalence, age, or trusted list criterion
Why this is correct
This ASR rule blocks executables that are not trusted based on Microsoft's reputation and prevalence data.
Related concept
Read the scenario before looking for a memorised answer.
✗
Block credential stealing from the Windows local security authority subsystem (lsass.exe)
Why it's wrong here
This rule prevents credential theft via LSASS, not blocking executed downloads.
✗
Block Adobe Reader from creating child processes
Why it's wrong here
This rule prevents Adobe Reader from spawning other processes, not blocking downloaded executables.
✗
Block persistence through WMI event subscription
Why it's wrong here
This rule blocks WMI-based persistence, not the execution of downloaded files.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse ASR rules focused on execution control (like blocking downloaded executables) with rules that block specific attack techniques (like credential theft or persistence), leading them to select a rule that addresses a different threat vector entirely.
Detailed technical explanation
How to think about this question
Under the hood, this ASR rule leverages the Mark-of-the-Web (MoTW) zone identifier stored in NTFS alternate data streams (e.g., Zone.Identifier) that browsers and email clients append to downloaded files. The rule evaluates file prevalence using Microsoft's cloud-based reputation service, age based on file creation timestamp, and a custom trusted list defined via Group Policy or Intune; files failing these checks are blocked at the kernel level by the Windows Defender Antivirus filter driver (WdFilter.sys). In real-world scenarios, this rule is critical for preventing initial access via malicious email attachments or drive-by downloads, but administrators must carefully manage false positives by adding legitimate but low-prevalence applications (e.g., internal tools) to the trusted list.
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 executable files from running unless they meet a prevalence, age, or trusted list criterion — Option A is correct because the ASR rule 'Block executable files from running unless they meet a prevalence, age, or trusted list criterion' (GUID: 01443614-cd74-433a-b99e-2ecdc07bfc25) specifically targets executable files (e.g., .exe, .scr) that have been downloaded from the internet by checking their Mark-of-the-Web (MoTW) attribute. When enabled, this rule prevents execution of such files unless they meet criteria like high prevalence, sufficient age, or inclusion in a trusted list, directly addressing the requirement to block internet-downloaded portable executables.
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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