Question 771 of 1,152

Threats, Vulnerabilities, and Mitigations →mediumMultiple ChoiceObjective-mapped

SY0-701 Threats, Vulnerabilities, and Mitigations Practice Question

This SY0-701 practice question tests your understanding of threats, vulnerabilities, and mitigations. 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.

An EDR alert shows powershell.exe launching with an encoded command, no new executable written to disk, and a registry run key added for persistence. Outbound HTTPS traffic then begins to a rare external domain. Which type of malware behavior is most likely?

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.

Question 1mediummultiple choice

Full question →

A
Worm behavior, because the malware is automatically spreading across the network.
Why wrong: Worms are self-replicating and spread to other hosts. The evidence here focuses on in-memory execution and persistence, not network propagation.
B
Fileless attack, because the malicious activity is using legitimate tools and memory rather than a dropped payload.
The alert shows encoded PowerShell, no new file on disk, and persistence through a registry run key. That pattern strongly suggests a fileless attack, where attackers abuse trusted system tools and memory-based execution to avoid traditional file detection.
C
Rootkit behavior, because the attacker is hiding from the operating system at a low level.
Why wrong: Rootkits focus on stealth and deep system compromise, often by hiding processes or files. The visible clues here point more directly to script abuse and diskless execution.
D
Spyware, because the malware is using HTTPS traffic to contact an external domain.
Why wrong: Spyware is designed to secretly collect information. While outbound HTTPS can be used by spyware, the encoded PowerShell and fileless behavior are more specific indicators in this case.

Full breakdown with real-world context →

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

✓

Fileless attack, because the malicious activity is using legitimate tools and memory rather than a dropped payload.

The EDR alert describes a classic fileless attack: PowerShell.exe executes an encoded command in memory, no new executable is written to disk, and persistence is achieved via a registry run key. The outbound HTTPS traffic to a rare domain indicates command-and-control (C2) communication. Fileless malware leverages legitimate system tools (like PowerShell) and runs entirely in memory, bypassing traditional file-based detection.

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.

✗
Worm behavior, because the malware is automatically spreading across the network.
Why it's wrong here
Worms are self-replicating and spread to other hosts. The evidence here focuses on in-memory execution and persistence, not network propagation.
✓
Fileless attack, because the malicious activity is using legitimate tools and memory rather than a dropped payload.
Why this is correct
The alert shows encoded PowerShell, no new file on disk, and persistence through a registry run key. That pattern strongly suggests a fileless attack, where attackers abuse trusted system tools and memory-based execution to avoid traditional file detection.
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.
✗
Rootkit behavior, because the attacker is hiding from the operating system at a low level.
Why it's wrong here
Rootkits focus on stealth and deep system compromise, often by hiding processes or files. The visible clues here point more directly to script abuse and diskless execution.
✗
Spyware, because the malware is using HTTPS traffic to contact an external domain.
Why it's wrong here
Spyware is designed to secretly collect information. While outbound HTTPS can be used by spyware, the encoded PowerShell and fileless behavior are more specific indicators in this case.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates see 'HTTPS traffic to an external domain' and jump to spyware (Option D), but the question's emphasis on 'no new executable written to disk' and 'encoded command' points directly to fileless attack, not data exfiltration as the primary behavior.

Detailed technical explanation

How to think about this question

Fileless attacks often use PowerShell's -EncodedCommand parameter to decode and execute Base64-encoded scripts directly in memory, avoiding disk writes. The registry run key (e.g., HKCU\Software\Microsoft\Windows\CurrentVersion\Run) provides persistence, and the outbound HTTPS traffic likely uses TLS to obscure C2 payloads. In real-world scenarios, such as Emotet or TrickBot, fileless techniques are used to evade antivirus and EDR that rely on file scanning.

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 developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.

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 SY0-701 question test?

Threats, Vulnerabilities, and Mitigations — This question tests Threats, Vulnerabilities, and Mitigations — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Fileless attack, because the malicious activity is using legitimate tools and memory rather than a dropped payload. — The EDR alert describes a classic fileless attack: PowerShell.exe executes an encoded command in memory, no new executable is written to disk, and persistence is achieved via a registry run key. The outbound HTTPS traffic to a rare domain indicates command-and-control (C2) communication. Fileless malware leverages legitimate system tools (like PowerShell) and runs entirely in memory, bypassing traditional file-based detection.

What should I do if I get this SY0-701 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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