This SC-200 practice question tests your understanding of perform threat hunting. 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
{
"displayName": "Hunt for Unusual Service Creation",
"description": "Detect abnormal service installations on servers.",
"tactics": ["Persistence", "Execution"],
"techniques": ["T1543.003"],
"query": "DeviceEvents\n| where ActionType == 'ServiceInstalled'\n| extend ServiceName = tostring(AdditionalFields['ServiceName'])\n| extend ServiceImagePath = tostring(AdditionalFields['ServiceImagePath'])\n| where ServiceName startswith 'Legit'\n| project TimeGenerated, DeviceName, ServiceName, ServiceImagePath",
"triggerOperator": "gt",
"triggerThreshold": 0
}
```
Refer to the exhibit. An analyst is reviewing this custom detection rule in Microsoft Sentinel. The rule is not generating any alerts even though services are being installed on servers. 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
{
"displayName": "Hunt for Unusual Service Creation",
"description": "Detect abnormal service installations on servers.",
"tactics": ["Persistence", "Execution"],
"techniques": ["T1543.003"],
"query": "DeviceEvents\n| where ActionType == 'ServiceInstalled'\n| extend ServiceName = tostring(AdditionalFields['ServiceName'])\n| extend ServiceImagePath = tostring(AdditionalFields['ServiceImagePath'])\n| where ServiceName startswith 'Legit'\n| project TimeGenerated, DeviceName, ServiceName, ServiceImagePath",
"triggerOperator": "gt",
"triggerThreshold": 0
}
```
A
The where clause filters for legitimate services only.
The condition 'ServiceName startswith 'Legit'' matches only services starting with 'Legit', so it alerts on legitimate services, not suspicious ones.
B
The extend functions are incorrectly parsing the AdditionalFields.
Why wrong: The parsing is correct.
C
The ActionType filter is incorrect.
Why wrong: ActionType 'ServiceInstalled' is valid.
D
The triggerThreshold should be set to a higher value.
Why wrong: Threshold 0 means any result triggers an alert; that is not the issue.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The where clause filters for legitimate services only.
Option A is correct. The where clause filters for ServiceName starting with 'Legit', which indicates legitimate services only. Therefore, the rule will only generate alerts if a service with a name starting with 'Legit' is installed, which is the opposite of detecting suspicious installations. This is why no alerts are triggered despite services being installed. Option B is incorrect because the ActionType filter is correctly set. Option C is incorrect because the extend functions are parsing correctly. Option D is incorrect because the trigger threshold is 0, meaning any result triggers an alert, so the threshold is not the issue.
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 where clause filters for legitimate services only.
Why this is correct
The condition 'ServiceName startswith 'Legit'' matches only services starting with 'Legit', so it alerts on legitimate services, not suspicious ones.
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 extend functions are incorrectly parsing the AdditionalFields.
Why it's wrong here
The parsing is correct.
✗
The ActionType filter is incorrect.
Why it's wrong here
ActionType 'ServiceInstalled' is valid.
✗
The triggerThreshold should be set to a higher value.
Why it's wrong here
Threshold 0 means any result triggers an alert; that is not the issue.
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.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SC-200 question in full detail.
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.
Perform threat hunting — This question tests Perform threat hunting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The where clause filters for legitimate services only. — Option A is correct. The where clause filters for ServiceName starting with 'Legit', which indicates legitimate services only. Therefore, the rule will only generate alerts if a service with a name starting with 'Legit' is installed, which is the opposite of detecting suspicious installations. This is why no alerts are triggered despite services being installed. Option B is incorrect because the ActionType filter is correctly set. Option C is incorrect because the extend functions are parsing correctly. Option D is incorrect because the trigger threshold is 0, meaning any result triggers an alert, so the threshold is not the issue.
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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