Question 398 of 750

Malware Types and Removal →hardMultiple ChoiceObjective-mapped

Polymorphic Malware Detection: Heuristic Analysis

This 220-1202 practice question tests your understanding of malware types and removal. 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.

A technician is dealing with a zero-day malware infection that has evaded all signature-based antivirus scans. The malware is polymorphic, changing its code each time it infects a new system. Which approach is most likely to detect and remove this type of malware?

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.

A
Update the antivirus to the latest signature definitions and run a full scan.
Why wrong: Signature-based detection relies on known patterns; polymorphic malware changes its signature, so updates may not catch it.
B
Use a bootable antivirus rescue disk to scan the system before the OS loads.
Why wrong: While a rescue disk can bypass some malware, it still relies on signatures and may miss polymorphic variants.
C
Employ a heuristic-based or behavior-based malware removal tool.
Heuristic tools analyze behavior and code patterns, allowing them to detect polymorphic malware that changes its signature.
D
Reinstall the operating system from a known-good backup.
Why wrong: Reinstalling removes the infection but does not detect or analyze the malware; it is a last resort, not a detection method.

Full breakdown with real-world context →

Quick Answer

The answer is to employ a heuristic-based or behavior-based malware removal tool. This is correct because polymorphic malware changes its code signature with each infection, rendering traditional signature-based antivirus scans completely ineffective. Heuristic analysis and behavior-based detection, often used in advanced endpoint detection and response (EDR) solutions, identify malware by monitoring for suspicious actions—such as unauthorized file encryption or registry changes—rather than relying on a static code match. On the CompTIA A+ Core 2 220-1202 exam, this question tests your understanding that zero-day and polymorphic threats require a behavioral approach; a common trap is choosing a signature-based scanner or a simple system restore, which won’t catch the mutating code. Remember the memory tip: “If it changes its face, watch its pace”—meaning when signatures fail, focus on the malware’s behavior to detect it.

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

✓

Employ a heuristic-based or behavior-based malware removal tool.

Heuristic and behavior-based detection tools analyze the actions and code patterns of malware rather than relying on static signatures. Since polymorphic malware changes its code with each infection, signature-based detection fails, but behavioral analysis can identify malicious activity such as registry modifications, process injection, or network anomalies. This approach is effective against zero-day threats because it detects anomalies without needing prior knowledge of the specific malware variant.

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.

✗
Update the antivirus to the latest signature definitions and run a full scan.
Why it's wrong here
Signature-based detection relies on known patterns; polymorphic malware changes its signature, so updates may not catch it.
✗
Use a bootable antivirus rescue disk to scan the system before the OS loads.
Why it's wrong here
While a rescue disk can bypass some malware, it still relies on signatures and may miss polymorphic variants.
✓
Employ a heuristic-based or behavior-based malware removal tool.
Why this is correct
Heuristic tools analyze behavior and code patterns, allowing them to detect polymorphic malware that changes its signature.
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.
✗
Reinstall the operating system from a known-good backup.
Why it's wrong here
Reinstalling removes the infection but does not detect or analyze the malware; it is a last resort, not a detection method.

Common exam traps

Common exam trap: answer the scenario, not the keyword

CompTIA often tests the misconception that bootable rescue disks or signature updates can overcome polymorphic or zero-day malware, when in reality only behavior-based or heuristic methods can detect such threats.

Detailed technical explanation

How to think about this question

Heuristic analysis uses techniques like dynamic analysis in a sandboxed environment to monitor API calls, file system writes, and network connections in real time. For example, a polymorphic malware sample may encrypt its payload differently each time, but its behavior—such as attempting to disable Windows Defender or create persistence via Run keys—remains consistent. Modern endpoint detection and response (EDR) tools combine heuristics with machine learning models trained on millions of benign and malicious behavior patterns to achieve high detection rates for novel threats.

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 practitioner preparing for the 220-1202 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this 220-1202 question test?

Malware Types and Removal — This question tests Malware Types and Removal — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Employ a heuristic-based or behavior-based malware removal tool. — Heuristic and behavior-based detection tools analyze the actions and code patterns of malware rather than relying on static signatures. Since polymorphic malware changes its code with each infection, signature-based detection fails, but behavioral analysis can identify malicious activity such as registry modifications, process injection, or network anomalies. This approach is effective against zero-day threats because it detects anomalies without needing prior knowledge of the specific malware variant.

What should I do if I get this 220-1202 question wrong?

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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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