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Respond to security incidents →hardMultiple ChoiceObjective-mapped

ASR Rule Not Blocking? Verify It's Not in Audit Mode

This SC-200 practice question tests your understanding of respond to security incidents. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.

Exhibit

Refer to the exhibit.

```json
{
  "properties": {
    "displayName": "Block malicious file types",
    "description": "Blocks execution of potentially malicious file types.",
    "policyContent": {
      "policyRule": {
        "if": {
          "allOf": [
            {
              "field": "fileExtension",
              "in": [".exe", ".dll", ".ps1"]
            },
            {
              "field": "initiatingProcessFileName",
              "equals": "outlook.exe"
            }
          ]
        },
        "then": {
          "effects": [
            {
              "type": "block",
              "action": "blockExecution"
            }
          ]
        }
      }
    }
  }
}
```

You deploy the above ASR rule in Microsoft Defender for Endpoint. After deployment, you notice that .exe files are still being executed from Outlook attachments. What is the most likely reason?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

  • Clue: "most likely"

    Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

Exhibit

Refer to the exhibit.

```json
{
  "properties": {
    "displayName": "Block malicious file types",
    "description": "Blocks execution of potentially malicious file types.",
    "policyContent": {
      "policyRule": {
        "if": {
          "allOf": [
            {
              "field": "fileExtension",
              "in": [".exe", ".dll", ".ps1"]
            },
            {
              "field": "initiatingProcessFileName",
              "equals": "outlook.exe"
            }
          ]
        },
        "then": {
          "effects": [
            {
              "type": "block",
              "action": "blockExecution"
            }
          ]
        }
      }
    }
  }
}
```

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

The ASR rule is configured in audit mode instead of block mode.

The correct answer is C. Attack Surface Reduction (ASR) rules in Microsoft Defender for Endpoint can operate in either block mode or audit mode. By default, when a rule is defined without specifying the enforcement mode, it may default to audit mode. In audit mode, the rule generates logs but does not actually block the execution. Therefore, even though the rule is deployed, .exe files from Outlook attachments can still be executed if the rule is not set to block mode. Option A is incorrect because the rule is designed to block executable files from email attachments regardless of the initiating process, as long as the rule is properly configured. Option B is incorrect because the issue is with .exe files, not .vbs files; the rule could block .vbs if configured, but that does not explain why .exe files are not blocked. Option D is incorrect because fileExtension is a supported field in ASR rules; the rule syntax shown is valid.

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.

  • ✗

    The rule only applies when the initiating process is outlook.exe, but the attachment may be launched from another process.

    Why it's wrong here

    This is incorrect. The ASR rule is designed to block executable files from email attachments irrespective of the initiating process, as long as the rule is properly configured in block mode.

  • ✗

    The rule does not block .vbs files, which are also commonly used in attacks.

    Why it's wrong here

    This is incorrect. The issue specifically concerns .exe files, not .vbs files. While .vbs files may also be used in attacks, the fact that .exe files are not blocked indicates the rule enforcement mode is the likely cause.

  • ✓

    The ASR rule is configured in audit mode instead of block mode.

    Why this is correct

    This is correct. ASR rules must be set to block mode to actively prevent execution. If the rule is in audit mode (the default), it only logs events and does not block, allowing .exe files to still run.

    Clue confirmation

    The clue word "most likely" in the question point toward this answer.

    Related concept

    Read the scenario before looking for a memorised answer.

  • ✗

    The rule is not applied because fileExtension is not a supported field in ASR rules.

    Why it's wrong here

    This is incorrect. The fileExtension field is supported in ASR rules. The rule syntax shown is valid; the issue is with the enforcement mode, not the field usage.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Trap categories for this question

  • Command / output trap

    This is incorrect. The fileExtension field is supported in ASR rules. The rule syntax shown is valid; the issue is with the enforcement mode, not the field usage.

Detailed technical explanation

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

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.
  • Use explanations to understand the rule behind the answer.

TExam Day Tips

  • Underline the problem statement mentally.
  • 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.

What to study next

Got this wrong? Here's your next step.

Identify which SC-200 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

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FAQ

Questions learners often ask

What does this SC-200 question test?

Respond to security incidents — This question tests Respond to security incidents — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The ASR rule is configured in audit mode instead of block mode. — The correct answer is C. Attack Surface Reduction (ASR) rules in Microsoft Defender for Endpoint can operate in either block mode or audit mode. By default, when a rule is defined without specifying the enforcement mode, it may default to audit mode. In audit mode, the rule generates logs but does not actually block the execution. Therefore, even though the rule is deployed, .exe files from Outlook attachments can still be executed if the rule is not set to block mode. Option A is incorrect because the rule is designed to block executable files from email attachments regardless of the initiating process, as long as the rule is properly configured. Option B is incorrect because the issue is with .exe files, not .vbs files; the rule could block .vbs if configured, but that does not explain why .exe files are not blocked. Option D is incorrect because fileExtension is a supported field in ASR rules; the rule syntax shown is valid.

What should I do if I get this SC-200 question wrong?

Identify which SC-200 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

Are there clue words in this question I should notice?

Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jun 21, 2026

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