CS0-003 Security Operations Practice Question
A security analyst is tuning a SIEM rule that triggers on any process creation event involving 'rundll32.exe'. The rule generates many false positives from legitimate software updates. Which tuning action would most effectively reduce false positives while maintaining detection of malicious use?
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
✓
Add an exclusion list for known good command-line arguments or parent processes
Creating an exception list for known legitimate processes or command lines that use rundll32.exe reduces false positives. However, the best approach is to modify the rule to include specific conditions such as parent process or command-line arguments that indicate malicious activity.
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 an exclusion list for known good command-line arguments or parent processes
Why this is correct
By implementing a baseline of authorized parent-child process relationships or whitelisting known-good command-line arguments, analysts can significantly suppress benign positive alerts. This targeted tuning preserves the SIEM's ability to detect anomalous or unauthorized executions of the binary while minimizing alert fatigue.
- ✗
Change the rule to trigger only on network connections from rundll32.exe
Why it's wrong here
Restricting the rule to trigger solely on network connections severely narrows the detection scope, leaving the organization blind to offline or local malicious activities. Attackers frequently use rundll32.exe to execute local payloads, dump credentials, or perform privilege escalation without initiating outbound network traffic, which this modification would fail to detect.
- ✗
Disable the rule entirely
Why it's wrong here
Deactivating the correlation rule completely eliminates visibility into a highly abused native Windows binary, creating a critical blind spot in the organization's defensive posture. While this action stops the influx of false positives, it leaves the environment entirely vulnerable to Living-off-the-Land (LotL) attacks that leverage rundll32.exe for stealthy execution.
- ✗
Increase the severity threshold of the rule
Why it's wrong here
Adjusting the severity or priority level of the alert does not resolve the underlying issue of high false-positive rates; it merely changes how the alert is categorized in the analyst's queue. The noisy, non-malicious events will continue to trigger, contributing to ongoing alert fatigue and potentially burying actual high-severity incidents under a flood of misclassified notifications.
Go deeper
Related to this question
Learn chapter
Security SLAs and SLOs
Key term
Security
Security in IT is the practice of protecting systems, networks, and data from unauthorized access, damage, or theft.
Key term
SIEM
SIEM (Security Information and Event Management) is a system that collects and analyzes log data from across an IT environment to detect and respond to security threats in real time.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CS0-004 practice question is part of Courseiva's free CompTIA 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 CS0-004 exam.