Quick Answer
The answer is behavioral analysis and process monitoring. This capability is most important for detecting fileless malware because fileless threats operate in memory, using legitimate system tools like PowerShell or WMI, leaving no traditional file signature for antivirus to match. Behavioral analysis identifies anomalous process behaviors—such as unexpected script execution or abnormal registry modifications—while process monitoring tracks runtime activity in real time, making it the only reliable method against these stealthy attacks. On the CISSP exam, this question tests your understanding of the detection domain within asset security and security operations, often appearing as a trap where candidates mistakenly choose signature-based detection. Remember: fileless malware has no file to scan, so signatures fail; behavior is the only clue. A useful memory tip is “No file, no sig—watch the behavior, catch the gig.”
This CISSP practice question tests your understanding of security operations. 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 team is evaluating a new endpoint detection and response (EDR) solution. Which of the following capabilities is MOST important for detecting fileless malware?
Static malware analysis.
Why wrong: Analyzes files on disk; fileless malware may never touch disk.
Signature-based detection.
Why wrong: Fileless malware often has no static signature.
Behavioral analysis and process monitoring.
Detects runtime behaviors like PowerShell abuse or process injection.
Network traffic inspection.
Why wrong: May detect C2 traffic but not the initial fileless execution.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Behavioral analysis and process monitoring.
Option B is correct because behavioral analysis and process monitoring detect anomalous behavior typical of fileless malware. Signature-based detection is ineffective against fileless variants.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Static malware analysis.
Why it's wrong here
Analyzes files on disk; fileless malware may never touch disk.
Signature-based detection.
Why it's wrong here
Fileless malware often has no static signature.
Behavioral analysis and process monitoring.
Why this is correct
Detects runtime behaviors like PowerShell abuse or process injection.
Related concept
Static NAT maps one inside address to one outside address.
Network traffic inspection.
Why it's wrong here
May detect C2 traffic but not the initial fileless execution.
Common exam traps
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
A SOC analyst notices unusual lateral movement in the network at 2 AM. The IR playbook dictates: identify and contain (isolate the affected machine), then eradicate (remove the malware), then recover (restore from backup), then document. Skipping containment before eradication risks the attacker regaining access. Questions like this test the sequence and rationale of incident response phases.
What to study next
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CISSP NAT questions on configuration and troubleshooting.
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FAQ
Security Operations — This question tests Security Operations — Static NAT maps one inside address to one outside address..
The correct answer is: Behavioral analysis and process monitoring. — Option B is correct because behavioral analysis and process monitoring detect anomalous behavior typical of fileless malware. Signature-based detection is ineffective against fileless variants.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CISSP NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 24, 2026
This CISSP practice question is part of Courseiva's free ISC2 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 CISSP exam.
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