Question 398 of 1,152

Threats, Vulnerabilities, and Mitigations →mediumMultiple ChoiceObjective-mapped

Quick Answer

The correct answer is a fileless attack because the malicious activity is operating primarily in memory and using native tools. This type of attack leverages PowerShell to execute code in a hidden window without writing any new executable files to disk, and persistence after reboot confirms the payload is stored in the registry or a startup script that loads directly into memory. On the Security+ SY0-701 exam, this scenario tests your understanding of how fileless attacks bypass traditional file-based antivirus by exploiting trusted system utilities like PowerShell, WMI, or .NET—a common trap is assuming a reboot would eliminate the threat, but fileless attacks often survive through registry run keys or scheduled tasks. Remember the memory tip: “No file, no disk, but still a risk—PowerShell in memory is the fileless trick.”

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.

A SOC analyst investigates a host after an employee opens an invoice attachment. The endpoint shows PowerShell running in a hidden window, no new executable files are created on disk, and the same suspicious activity returns after a reboot. What is the most likely attack type?

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
Fileless attack, because the malicious activity is operating primarily in memory and using native tools.
Fileless attacks rely on legitimate scripting engines and memory-resident techniques instead of dropping obvious executable files. Hidden PowerShell activity, repeated behavior after reboot, and the absence of a new binary are strong signs that the attacker is leveraging trusted operating system components. This approach often helps malware evade traditional file-based scanning while still achieving persistence or command execution.
B
Ransomware, because the user opened an email attachment.
Why wrong: Opening an attachment is only the delivery method; the symptoms do not include encryption, ransom notes, or blocked file access.
C
Worm, because PowerShell is a common scripting tool.
Why wrong: A worm is defined by self-replication across systems, not by use of PowerShell or hidden execution alone.
D
Rootkit, because the attacker is hiding the process from normal tools.
Why wrong: Rootkits hide persistence or activity, but the key clues here are memory-only execution and use of native scripting tools.

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 operating primarily in memory and using native tools.

The correct answer is A because the attack is fileless: it runs PowerShell in a hidden window without writing new executables to disk, and persistence after reboot indicates the malicious code is stored in the registry or a script that loads into memory at startup. Fileless attacks leverage native tools like PowerShell, WMI, or .NET to execute payloads 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.

✓
Fileless attack, because the malicious activity is operating primarily in memory and using native tools.
Why this is correct
Fileless attacks rely on legitimate scripting engines and memory-resident techniques instead of dropping obvious executable files. Hidden PowerShell activity, repeated behavior after reboot, and the absence of a new binary are strong signs that the attacker is leveraging trusted operating system components. This approach often helps malware evade traditional file-based scanning while still achieving persistence or command execution.
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.
✗
Ransomware, because the user opened an email attachment.
Why it's wrong here
Opening an attachment is only the delivery method; the symptoms do not include encryption, ransom notes, or blocked file access.
✗
Worm, because PowerShell is a common scripting tool.
Why it's wrong here
A worm is defined by self-replication across systems, not by use of PowerShell or hidden execution alone.
✗
Rootkit, because the attacker is hiding the process from normal tools.
Why it's wrong here
Rootkits hide persistence or activity, but the key clues here are memory-only execution and use of native scripting tools.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates confuse 'fileless' with 'no persistence' or assume any attachment-based attack is ransomware, but the key indicators—hidden PowerShell, no new executables, and post-reboot persistence—point directly to a fileless attack using native Windows tools.

Detailed technical explanation

How to think about this question

Fileless attacks often use PowerShell to download and execute a payload from a remote server (e.g., via Invoke-Expression or .NET WebClient) directly into memory, leaving no trace on disk. Persistence can be achieved by writing a PowerShell command to a registry Run key (e.g., HKCU\Software\Microsoft\Windows\CurrentVersion\Run) that launches a hidden PowerShell window at boot, reloading the malicious script into memory. Real-world examples include Emotet and TrickBot, which use macro-enabled documents to invoke PowerShell and load malware without dropping files.

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 security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.

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 operating primarily in memory and using native tools. — The correct answer is A because the attack is fileless: it runs PowerShell in a hidden window without writing new executables to disk, and persistence after reboot indicates the malicious code is stored in the registry or a script that loads into memory at startup. Fileless attacks leverage native tools like PowerShell, WMI, or .NET to execute payloads 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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