Question 761 of 1,152

Threats, Vulnerabilities, and Mitigations →mediumMultiple ChoiceObjective-mapped

Quick Answer

The correct answer is fileless malware that relies on scripting and memory-resident execution. This behavior is the classic hallmark of fileless malware because it leverages a legitimate system tool—PowerShell—to run an encoded command entirely in memory, avoiding any new executable written to disk, while the outbound connection to a newly registered domain indicates command-and-control communication. On the Security+ SY0-701 exam, this scenario tests your understanding of how attackers abuse trusted processes like PowerShell to bypass traditional antivirus and forensic tools, often using encoded commands to obfuscate payloads. A common trap is assuming a file must be written for malware to execute, but fileless attacks prove otherwise. Memory tip: think “no file, no disk, just script in RAM” to recall that fileless malware lives only in volatile memory.

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.

During triage, you see a legitimate browser process spawning powershell.exe with an encoded command, followed by an outbound connection to a newly registered domain. No new executable is written to disk. Which malware characteristic best fits this behavior?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.

Question 1mediummultiple choice

Full question →

A
Fileless malware that relies on scripting and memory-resident execution.
This pattern matches malware that abuses trusted processes and scripts instead of dropping a traditional executable file. Browser-to-PowerShell chaining, encoded commands, and memory-resident activity are common indicators. The lack of a new file on disk does not mean the endpoint is clean; it often means the attacker is trying to evade traditional file-based detection.
B
A macro virus that only runs when a document is opened.
Why wrong: Macros can initiate malicious activity, but the observed browser and PowerShell chain points to a broader fileless execution pattern.
C
A boot sector virus that persists by altering startup code.
Why wrong: Boot sector malware targets disk boot areas, not browser-initiated scripts or outbound web connections.
D
A logic bomb that activates only when a specific date or event is reached.
Why wrong: Logic bombs are time- or condition-triggered, but they do not explain the observed process injection and command execution pattern.

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 malware that relies on scripting and memory-resident execution.

Option A is correct because the described behavior—a legitimate browser process spawning PowerShell with an encoded command, executing in memory without writing a new executable to disk, and making an outbound connection to a newly registered domain—is the classic hallmark of fileless malware. Fileless malware leverages built-in scripting engines (like PowerShell) and runs entirely in memory, avoiding traditional disk-based detection by antivirus and forensic tools.

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 malware that relies on scripting and memory-resident execution.
Why this is correct
This pattern matches malware that abuses trusted processes and scripts instead of dropping a traditional executable file. Browser-to-PowerShell chaining, encoded commands, and memory-resident activity are common indicators. The lack of a new file on disk does not mean the endpoint is clean; it often means the attacker is trying to evade traditional file-based detection.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
A macro virus that only runs when a document is opened.
Why it's wrong here
Macros can initiate malicious activity, but the observed browser and PowerShell chain points to a broader fileless execution pattern.
✗
A boot sector virus that persists by altering startup code.
Why it's wrong here
Boot sector malware targets disk boot areas, not browser-initiated scripts or outbound web connections.
✗
A logic bomb that activates only when a specific date or event is reached.
Why it's wrong here
Logic bombs are time- or condition-triggered, but they do not explain the observed process injection and command execution pattern.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates may assume any malware that doesn't write a file is a 'macro virus' or 'boot sector virus,' but the key differentiator is the use of a scripting engine (PowerShell) spawned by a legitimate process, combined with memory-only execution and an immediate C2 connection, which uniquely defines fileless malware.

Trap categories for this question

Command / output trap
Logic bombs are time- or condition-triggered, but they do not explain the observed process injection and command execution pattern.

Detailed technical explanation

How to think about this question

Fileless malware often uses PowerShell's `-EncodedCommand` parameter to execute Base64-encoded scripts directly in memory, bypassing traditional file-scanning. The outbound connection to a newly registered domain (often via HTTP or HTTPS) is a common command-and-control (C2) channel, leveraging DNS fast-flux or domain generation algorithms (DGAs) to evade static blocklists. This technique is frequently seen in advanced persistent threats (APTs) and ransomware like Ryuk, which use living-off-the-land binaries (LOLBins) to blend in with legitimate administrative activity.

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 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

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 malware that relies on scripting and memory-resident execution. — Option A is correct because the described behavior—a legitimate browser process spawning PowerShell with an encoded command, executing in memory without writing a new executable to disk, and making an outbound connection to a newly registered domain—is the classic hallmark of fileless malware. Fileless malware leverages built-in scripting engines (like PowerShell) and runs entirely in memory, avoiding traditional disk-based detection by antivirus and forensic tools.

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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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