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 laptop user reports that many files now have strange extensions, a ransom note appears on the desktop, and the files cannot be opened. Which malware is most likely responsible?
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 from a system, such as browsing activity or keystrokes. It does not usually encrypt files and demand payment.
B
Ransomware
Ransomware encrypts files or blocks access to systems and then demands payment for recovery. Strange file extensions and a ransom note are common signs that the malware has encrypted local data.
C
Rootkit
Why wrong: A rootkit is designed to hide itself and maintain stealthy control over a system. It does not primarily cause visible file encryption and ransom demands.
D
Worm
Why wrong: A worm self-replicates across systems, often through networks. It may spread widely, but the prompt focuses on encryption and ransom, which point to a different threat.
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 encrypts the user's files, appends a new extension (e.g., .encrypted or .locked), and displays a ransom note demanding payment for the decryption key. The symptoms of inaccessible files with altered extensions and a visible ransom note are the classic indicators of a ransomware infection, such as those caused by CryptoLocker or LockBit.
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 from a system, such as browsing activity or keystrokes. It does not usually encrypt files and demand payment.
✓
Ransomware
Why this is correct
Ransomware encrypts files or blocks access to systems and then demands payment for recovery. Strange file extensions and a ransom note are common signs that the malware has encrypted local data.
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 is designed to hide itself and maintain stealthy control over a system. It does not primarily cause visible file encryption and ransom demands.
✗
Worm
Why it's wrong here
A worm self-replicates across systems, often through networks. It may spread widely, but the prompt focuses on encryption and ransom, which point to a different threat.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse ransomware with a worm because both can spread rapidly, but the key differentiator is the ransom note and file encryption, which are unique to ransomware.
Detailed technical explanation
How to think about this question
Modern ransomware often uses hybrid encryption: a symmetric key (e.g., AES-256) encrypts the files quickly, and that symmetric key is then encrypted with an asymmetric public key (e.g., RSA-2048) so only the attacker's private key can decrypt it. The ransom note typically includes a unique victim ID and instructions for payment, often in cryptocurrency like Bitcoin, to maintain anonymity. Some ransomware variants also delete Volume Shadow Copies (vssadmin.exe delete shadows /all) to prevent file recovery.
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 encrypts the user's files, appends a new extension (e.g., .encrypted or .locked), and displays a ransom note demanding payment for the decryption key. The symptoms of inaccessible files with altered extensions and a visible ransom note are the classic indicators of a ransomware infection, such as those caused by CryptoLocker or LockBit.
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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Question Discussion
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