The answer is a fileless attack. This is correct because the scenario describes malicious code executed entirely in memory via PowerShell, with no executable file written to disk—the defining technical characteristic of a fileless attack. These attacks abuse trusted system tools like PowerShell, WMI, or .NET to run payloads directly in RAM, bypassing traditional file-scanning antivirus. On the Security+ SY0-701 exam, this concept tests your understanding of how modern malware evades signature-based detection; a common trap is confusing it with a logic bomb or Trojan, which both rely on a file on disk. Remember the key distinction: if no new .exe or .dll is written, it’s fileless. Memory tip: “No file, no disk—fileless is the risk.”
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 user opens an attached document, and the endpoint security tool shows PowerShell running from memory with no new executable file written to disk. What type of attack 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Fileless attack
The scenario describes PowerShell running from memory without a new executable file written to disk, which is the hallmark of a fileless attack. Fileless attacks leverage legitimate system tools like PowerShell, WMI, or .NET to execute malicious code directly in memory, bypassing traditional file-based detection mechanisms.
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
Why this is correct
Fileless attacks use legitimate tools or memory-only execution instead of dropping a visible malicious file.
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
Why it's wrong here
Ransomware encrypts files and demands payment, which is not the main symptom described here.
✗
Rootkit
Why it's wrong here
A rootkit hides itself deeply, but the clue here is memory-based execution without a new file.
✗
Logic bomb
Why it's wrong here
A logic bomb triggers on a condition or date, but this scenario centers on how the code executes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse 'fileless' with 'no malware at all' or think that any attack using PowerShell must be a script-based attack, but the key indicator is the lack of a new executable file on disk, which distinguishes fileless attacks from traditional malware that writes files.
Trap categories for this question
Scenario analysis trap
A logic bomb triggers on a condition or date, but this scenario centers on how the code executes.
Detailed technical explanation
How to think about this question
Fileless attacks often use PowerShell to download and execute payloads directly in memory using techniques like reflection or invoke-expression, avoiding the Windows Event Logs that track process creation. Real-world examples include the 'PowerShell Empire' framework and attacks that leverage WMI for persistence, where the malicious code never touches the disk, making forensic analysis challenging.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this SY0-701 question in full detail.
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 — The scenario describes PowerShell running from memory without a new executable file written to disk, which is the hallmark of a fileless attack. Fileless attacks leverage legitimate system tools like PowerShell, WMI, or .NET to execute malicious code directly in memory, bypassing traditional file-based detection mechanisms.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A finance laptop is opened to review an invoice attachment. EDR then shows winword.exe launching powershell.exe with hidden, no-profile, and base64-encoded arguments. No executable is written to disk, network beacons begin from memory, and after a reboot the activity disappears unless the document is opened again. What type of malware behavior is most likely?
hard
A.Worm behavior, because the infection would self-replicate across systems through the network.
✓ B.Fileless attack, because malicious code runs in memory and leaves little or no executable artifact on disk.
C.Rootkit behavior, because the malware is hidden from normal user-mode tools.
D.Ransomware, because the user opened an invoice attachment before the suspicious activity started.
Why B: The scenario describes malicious code that executes entirely in memory without writing an executable to disk, which is the defining characteristic of a fileless attack. Winword.exe launching PowerShell with hidden, no-profile, and base64-encoded arguments is a classic technique to load and execute payloads directly in memory, bypassing traditional file-based detection. The fact that activity disappears after reboot unless the document is reopened confirms that no persistent artifact remains on disk, further supporting fileless behavior.
Last reviewed: Jun 11, 2026
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