The correct approach is to add a condition that excludes processes signed by trusted certificates or originating from known IT admin accounts. This directly reduces false positives in custom detection rules by filtering out legitimate administrative activity that would otherwise trigger alerts. In Microsoft Defender XDR, custom detection rules use Kusto Query Language (KQL) to query tables like DeviceProcessEvents, and you can refine the query with additional `where` clauses to exclude trusted signers or specific user accounts, preserving detection of truly malicious PowerShell commands while ignoring benign ones. On the SC-200 exam, this tests your ability to balance detection fidelity with operational noise—a common trap is to over-narrow the query by excluding too much, so remember that the goal is to exclude only what is verifiably trusted, not all known processes. A useful memory tip is “sign and admin, not the bad actor”—focus on excluding trusted certificates and admin accounts rather than trying to block specific malicious patterns.
SC-200 Manage a security operations environment Practice Question
This SC-200 practice question tests your understanding of manage a security operations environment. 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.
Your organization uses Microsoft Defender XDR and has a custom detection rule that queries DeviceProcessEvents for suspicious PowerShell commands. You notice that the rule is generating a high number of false positives. You need to reduce false positives while still detecting real threats. What should you do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Add a condition to exclude processes signed by trusted certificates or from known IT admin accounts.
Option A is correct because adding a condition to exclude processes signed by trusted certificates or from known IT admin accounts directly reduces false positives by filtering out legitimate administrative activity. Custom detection rules in Microsoft Defender XDR allow you to refine queries with additional conditions, such as excluding specific signers or accounts, which preserves detection of malicious PowerShell commands while ignoring benign ones.
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.
✓
Add a condition to exclude processes signed by trusted certificates or from known IT admin accounts.
Why this is correct
Correct. Excluding known benign processes reduces false positives.
Related concept
Read the scenario before looking for a memorised answer.
✗
Disable the rule and create a new rule with a different MITRE technique.
Why it's wrong here
Incorrect. Disabling the rule stops detection entirely.
✗
Increase the lookback period from 7 to 30 days.
Why it's wrong here
Incorrect. Longer lookback may increase false positives.
✗
Modify the rule to set the severity to 'Informational'.
Why it's wrong here
Incorrect. Severity change does not reduce false positives.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think lowering severity or changing the detection technique reduces false positives, but only refining the query logic (e.g., excluding trusted signers or accounts) directly addresses the root cause of false alerts.
Detailed technical explanation
How to think about this question
Under the hood, DeviceProcessEvents in Microsoft Defender XDR captures process creation events with fields like Signer, InitiatingProcessAccountName, and SHA1 hash. By adding a condition such as `| where Signer !in~ ('Microsoft Corporation', 'Microsoft Windows')` or `| where InitiatingProcessAccountName !startswith 'ITAdmin'`, the query filters out trusted processes before the rule triggers an alert. In a real-world scenario, a SOC might also exclude PowerShell scripts launched from Configuration Manager or SCCM to avoid noise from legitimate automation.
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 SC-200 question in full detail.
Manage a security operations environment — This question tests Manage a security operations environment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Add a condition to exclude processes signed by trusted certificates or from known IT admin accounts. — Option A is correct because adding a condition to exclude processes signed by trusted certificates or from known IT admin accounts directly reduces false positives by filtering out legitimate administrative activity. Custom detection rules in Microsoft Defender XDR allow you to refine queries with additional conditions, such as excluding specific signers or accounts, which preserves detection of malicious PowerShell commands while ignoring benign ones.
What should I do if I get this SC-200 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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