The correct answer is Indicators of compromise (IOCs). This feature allows a security analyst to block a file hash across all endpoints immediately in Microsoft Defender for Endpoint by creating a custom indicator with an “Alert and Block” action, which enforces the block in near real-time on every managed device without relying on signature updates. On the MS-102 exam, this scenario tests your understanding of how IOCs provide rapid, organization-wide threat response, often appearing as a distractor against options like automated investigation or ASR rules. A common trap is confusing IOCs with threat intelligence feeds—remember that IOCs are custom, analyst-created blocks, while feeds are pre-built. Memory tip: IOC stands for “I O-Create” the block, putting you in control of the immediate response.
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 analyst identifies a malicious file hash on one endpoint. They need to ensure that file is blocked from executing on all other endpoints in the organization immediately. Which Microsoft Defender for Endpoint feature should be used?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Indicators of compromise (IOCs)
Indicators of compromise (IOCs) in Microsoft Defender for Endpoint allow security analysts to create custom indicators (e.g., file hashes, IPs, URLs) that are enforced across all endpoints in near real-time. By adding the malicious file hash as an IOC with an 'Alert and Block' action, the file is immediately prevented from executing on any managed device, providing a rapid, organization-wide block without waiting for signature updates.
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.
✓
Indicators of compromise (IOCs)
Why this is correct
IOCs allow creating custom policy to block file hashes across all endpoints.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Attack surface reduction rules
Why it's wrong here
These rules block behaviors (e.g., Office apps creating child processes), not specific file hashes.
✗
Automated investigation and response
Why it's wrong here
AIR automates response to alerts but does not provide a method to block arbitrary file hashes globally.
✗
Custom detection rules
Why it's wrong here
Custom detection rules use advanced hunting queries for alerts, not for blocking execution.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse 'Indicators of compromise (IOCs)' with 'Custom detection rules,' because both involve custom definitions, but IOCs are for immediate blocking of known artifacts while custom detection rules are for behavioral detection over time.
Detailed technical explanation
How to think about this question
When a file hash IOC is created with the 'Alert and Block' action, Defender for Endpoint injects the hash into the Windows Defender Antivirus cloud block list, which is enforced at the kernel level via the Microsoft Malware Protection Engine (MsMpEng). This block is applied within minutes across all endpoints, even if the file is already present, because the cloud-delivered protection checks every file execution against the latest IOC list. In a real-world scenario, this is critical for containing a fast-spreading ransomware outbreak where a single hash must be blocked globally before lateral movement occurs.
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: Indicators of compromise (IOCs) — Indicators of compromise (IOCs) in Microsoft Defender for Endpoint allow security analysts to create custom indicators (e.g., file hashes, IPs, URLs) that are enforced across all endpoints in near real-time. By adding the malicious file hash as an IOC with an 'Alert and Block' action, the file is immediately prevented from executing on any managed device, providing a rapid, organization-wide block without waiting for signature updates.
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.
Are there clue words in this question I should notice?
Yes — watch for: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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 security analyst has identified a new malware sample with SHA256 hash 'abc123...'. They need to immediately block this file from executing on any managed endpoint across the organization. Which Microsoft Defender for Endpoint capability should they use?
hard
A.Attack surface reduction rules
✓ B.Indicators (IoC)
C.Automated investigation and response
D.Threat analytics
Why B: Option B is correct because Indicators of Compromise (IoC) in Microsoft Defender for Endpoint allow security analysts to create custom indicators (such as file hashes, IPs, or URLs) that are immediately enforced across all managed endpoints. This capability enables blocking execution of a specific SHA256 hash at the kernel level via the Microsoft Defender Antivirus driver, providing near-instant protection without requiring a signature update or policy change.
Variation 2. A security analyst has identified a new malware sample with a specific SHA256 hash. The analyst needs to immediately block this file from executing on any managed endpoint across the organization, including prevention of future execution. Which Microsoft Defender for Endpoint capability should the analyst use?
medium
A.Attack surface reduction (ASR) rules
✓ B.Indicators (IoCs) for file hashes
C.Custom detection rules via advanced hunting
D.Microsoft Defender Vulnerability Management
Why B: Option B is correct because Indicators of Compromise (IoCs) for file hashes in Microsoft Defender for Endpoint allow an analyst to create a block indicator for a specific SHA256 hash. This action immediately prevents the file from executing on any managed endpoint and persists across reboots, effectively blocking future execution attempts. Unlike other capabilities, IoCs provide a direct, hash-based block that is enforced by the Microsoft Defender Antivirus engine at the point of execution.
Last reviewed: Jun 11, 2026
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This MS-102 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the MS-102 exam.
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