The answer is to disconnect the laptop and reimage it from a known-good source, because once a rootkit is confirmed, the system’s kernel or boot-level integrity is irreversibly compromised. Unlike standard malware, a rootkit can hide processes, alter system files, and persist through reboots, making any software-based cleanup or antivirus scan unreliable—the only way to guarantee complete eradication is to wipe the drive and restore from a trusted baseline. On the Security+ SY0-701 exam, this question tests your understanding of incident response containment and eradication, specifically that rootkit removal reimage is the mandatory step, not forensic analysis or boot-time repair. A common trap is choosing “run an anti-rootkit tool,” but remember: once the kernel is owned, you cannot trust the tools running on it. Memory tip: “If the root is rotten, reimage the lot.”
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 security team suspects a rootkit after seeing hidden processes, boot-time persistence, and altered system files on a laptop. What is the best next step after confirming the suspicion?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Disconnect the laptop, then reimage it from a known-good source
Once a rootkit is confirmed, the system's integrity is compromised at the kernel or boot level, making any software-based cleanup unreliable. Reimaging from a known-good source ensures all malicious code, including bootkits and hidden processes, is completely eradicated. This aligns with the SY0-701 domain of incident response, where containment and eradication require a trusted baseline.
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.
✗
Run a quick cleanup script and return the laptop to the user
Why it's wrong here
Rootkits are difficult to trust-clean, and a quick cleanup does not provide assurance of full removal.
✓
Disconnect the laptop, then reimage it from a known-good source
Why this is correct
A rootkit can hide deeply in the system, so reimaging from trusted media is the safest way to restore integrity.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Disable the user account and leave the device in place
Why it's wrong here
Account disabling may limit access, but it does not remove malicious code already installed on the laptop.
✗
Delete the suspected hidden files manually from Windows Explorer
Why it's wrong here
Manual deletion is unreliable because rootkits can conceal components and reinstall themselves after partial removal.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think a cleanup script or manual deletion is sufficient, but rootkits operate below the OS level, making reimaging the only reliable method to restore integrity.
Detailed technical explanation
How to think about this question
Rootkits often hook system calls like NtQuerySystemInformation to hide processes and files, and may use bootkits that load before the OS, such as modifying the UEFI firmware or the Master Boot Record (MBR). Reimaging overwrites the entire storage volume, including the boot sector and system partitions, ensuring no remnants of the rootkit remain. In real-world scenarios, even advanced rootkits like TDL-4 or Alureon have been defeated only by a full reimage.
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.
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: Disconnect the laptop, then reimage it from a known-good source — Once a rootkit is confirmed, the system's integrity is compromised at the kernel or boot level, making any software-based cleanup unreliable. Reimaging from a known-good source ensures all malicious code, including bootkits and hidden processes, is completely eradicated. This aligns with the SY0-701 domain of incident response, where containment and eradication require a trusted baseline.
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.
About these practice questions
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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 Linux server is missing expected security-agent processes, but users can still connect to the application. Local command output does not show a suspicious daemon that another monitoring tool says is listening on port 4444. A raw disk scan reveals a kernel module loaded at boot, and several files appear only when viewed outside the normal operating system tools. What malware type is most likely?
hard
A.Trojan, because it could have introduced the suspicious service after the initial compromise.
B.Spyware, because it may collect data while leaving the application functional.
✓ C.Rootkit, because kernel-level components are hiding processes and files from normal user-mode visibility.
D.Logic bomb, because the malware activates after startup and changes what administrators see.
Why C: Option C is correct because the scenario describes a rootkit: a kernel-level rootkit can load a malicious kernel module at boot, intercept system calls (e.g., `open`, `readdir`, `netstat`), and hide processes, files, and network listeners from user-mode tools like `ps`, `ls`, or `netstat`. The raw disk scan reveals files invisible to normal OS tools, and the missing security-agent processes and hidden daemon on port 4444 are classic signs of kernel-mode hooking that bypasses standard visibility.
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Question Discussion
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