Ransomware is the correct choice because it specifically encrypts files using strong algorithms like AES or RSA, then appends new extensions or renames documents entirely, drops ransom notes demanding payment, and denies users access to their data. This scenario tests your ability to perform ransomware identification by recognizing the classic triad of file renaming, ransom notes, and access loss—a core objective in the Security+ SY0-701 exam under malware types and attack vectors. A common trap is confusing ransomware with a logic bomb or Trojan, but remember: only ransomware demands a ransom for decryption keys. For the exam, focus on the behavioral signature: if files are renamed and notes appear, think encryption, not deletion. Memory tip: “Rename, Note, Deny—that’s Ransomware’s battle cry.”
SY0-701 Threats, Vulnerabilities, and Mitigations Practice Question
This SY0-701 practice question tests your understanding of threats, vulnerabilities, and mitigations. 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 file server suddenly renames documents, creates ransom notes, and users can no longer open their files. Which malware type is most likely involved?
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.
Why wrong: Spyware secretly collects information, but it does not usually encrypt files and demand payment.
B
Ransomware
Ransomware encrypts or blocks access to data and demands payment for recovery. Renaming files and leaving ransom notes are classic signs, especially when users can no longer open shared documents.
C
Rootkit
Why wrong: A rootkit hides malware or attacker activity, but it does not typically rename files or display payment demands.
D
Worm
Why wrong: A worm spreads itself across systems, but file encryption and ransom notes point to a different malware type.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Ransomware
Ransomware is the correct answer because it specifically encrypts files and demands payment for decryption. The symptoms—documents being renamed, ransom notes appearing, and users losing access to their files—are classic indicators of ransomware activity, which typically uses strong encryption algorithms like AES or RSA to lock files.
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.
✗
Spyware
Why it's wrong here
Spyware secretly collects information, but it does not usually encrypt files and demand payment.
✓
Ransomware
Why this is correct
Ransomware encrypts or blocks access to data and demands payment for recovery. Renaming files and leaving ransom notes are classic signs, especially when users can no longer open shared documents.
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
Why it's wrong here
A rootkit hides malware or attacker activity, but it does not typically rename files or display payment demands.
✗
Worm
Why it's wrong here
A worm spreads itself across systems, but file encryption and ransom notes point to a different malware type.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse the file-renaming and note-creation behavior with a logic bomb or virus, but the core differentiator is the extortion demand and encryption-based access loss, which is unique to ransomware.
Detailed technical explanation
How to think about this question
Ransomware often uses a combination of symmetric encryption (e.g., AES-256) for speed and asymmetric encryption (e.g., RSA-2048) to protect the symmetric key, ensuring only the attacker can decrypt. In a real-world scenario like the 2017 WannaCry outbreak, the malware exploited the EternalBlue SMB vulnerability (MS17-010) to propagate and then encrypted files with a .wncry extension, dropping ransom notes named @Please_Read_Me@.txt.
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.
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: Ransomware — Ransomware is the correct answer because it specifically encrypts files and demands payment for decryption. The symptoms—documents being renamed, ransom notes appearing, and users losing access to their files—are classic indicators of ransomware activity, which typically uses strong encryption algorithms like AES or RSA to lock files.
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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