The correct answer is to remove persistence artifacts and rebuild the endpoint from a known-good image. This is the best eradication decision after containment because simply deleting the malicious startup item and scheduled task leaves the system vulnerable to hidden rootkits, registry remnants, or fileless malware that may have evaded detection. In the Security+ SY0-701 exam, this scenario tests your understanding of the incident response phase where eradication must be thorough—containment buys time, but only a full rebuild ensures no persistence mechanisms remain. A common trap is thinking that removing visible artifacts is sufficient, but the exam emphasizes that malware can reinfect through dormant code or system-level hooks. Remember the mnemonic “CLEAN: Contain, Log, Eradicate, Accept, Normalize”—where eradication demands a known-good rebuild to truly eliminate all traces of compromise.
SY0-701 Security Operations Practice Question
This SY0-701 practice question tests your understanding of security operations. 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.
Exhibit
Host: eng-lt-44
Containment status: network quarantined
Registry artifact:
HKCU\Software\Microsoft\Windows\CurrentVersion\Run\Updater = C:\Users\maria\AppData\Roaming\update.exe
Scheduled task:
TaskName: SysMaint
Action: C:\Users\maria\AppData\Roaming\update.exe /svc
Trigger: every 30 minutes
File hash:
update.exe SHA256 matches known malware family 'QuillDoor'
User impact:
- Browser pop-ups observed earlier
- No confirmed encryption
- No evidence of additional hosts compromised
Based on the exhibit, what is the best eradication decision after containment?
A quarantined endpoint was found to have a malicious startup item and a scheduled task. The team has already isolated it from the network and preserved memory for analysis.
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.
Host: eng-lt-44
Containment status: network quarantined
Registry artifact:
HKCU\Software\Microsoft\Windows\CurrentVersion\Run\Updater = C:\Users\maria\AppData\Roaming\update.exe
Scheduled task:
TaskName: SysMaint
Action: C:\Users\maria\AppData\Roaming\update.exe /svc
Trigger: every 30 minutes
File hash:
update.exe SHA256 matches known malware family 'QuillDoor'
User impact:
- Browser pop-ups observed earlier
- No confirmed encryption
- No evidence of additional hosts compromised
A
Delete only the update.exe file and reconnect the host once the user confirms it is working.
Why wrong: Removing one file may leave persistence mechanisms in place and can reintroduce the malware quickly.
B
Remove persistence artifacts and rebuild the endpoint from a known-good image before returning it to service.
The host contains a malicious executable plus two persistence mechanisms, so cleanup must remove more than the payload file. Reimaging from trusted media provides the most reliable eradication path, especially when the malware family is already identified and the machine has been quarantined. This reduces the chance of hidden remnants, registry persistence, or tampered system components surviving the response effort.
C
Restore network connectivity now because no encryption was observed.
Why wrong: The absence of encryption does not mean the endpoint is clean; persistence artifacts still exist.
D
Change the DNS servers for the entire enterprise to block the malware domain.
Why wrong: DNS changes might reduce callback traffic, but they do not eradicate the infected endpoint or its persistence.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Remove persistence artifacts and rebuild the endpoint from a known-good image before returning it to service.
Option B is correct because after containment (network isolation and memory preservation), the best eradication step is to remove all persistence mechanisms (startup item and scheduled task) and rebuild the endpoint from a known-good image. This ensures that any undetected malware remnants, rootkits, or hidden artifacts are eliminated, preventing reinfection. Simply deleting files or changing DNS does not guarantee the system is clean, and reconnecting without a full rebuild risks lateral movement or data exfiltration.
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.
✗
Delete only the update.exe file and reconnect the host once the user confirms it is working.
Why it's wrong here
Removing one file may leave persistence mechanisms in place and can reintroduce the malware quickly.
✓
Remove persistence artifacts and rebuild the endpoint from a known-good image before returning it to service.
Why this is correct
The host contains a malicious executable plus two persistence mechanisms, so cleanup must remove more than the payload file. Reimaging from trusted media provides the most reliable eradication path, especially when the malware family is already identified and the machine has been quarantined. This reduces the chance of hidden remnants, registry persistence, or tampered system components surviving the response effort.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Restore network connectivity now because no encryption was observed.
Why it's wrong here
The absence of encryption does not mean the endpoint is clean; persistence artifacts still exist.
✗
Change the DNS servers for the entire enterprise to block the malware domain.
Why it's wrong here
DNS changes might reduce callback traffic, but they do not eradicate the infected endpoint or its persistence.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may choose Option A, thinking that deleting the malicious file is sufficient, but CompTIA emphasizes that persistence artifacts must be removed and a system should be rebuilt from a trusted image to ensure complete eradication.
Detailed technical explanation
How to think about this question
Eradication in incident response (NIST SP 800-61) requires removing all traces of the threat, including registry run keys, scheduled tasks (e.g., via schtasks.exe or Task Scheduler API), and startup folders. Reimaging from a known-good baseline (e.g., using MDT, SCCM, or a golden image) ensures that low-level persistence like bootkits or driver-based malware are eliminated, as these can survive file deletion. In real-world attacks like Emotet or TrickBot, persistence often involves multiple mechanisms, so a full rebuild is the only reliable method to achieve a clean state.
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.
Security Operations — This question tests Security Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Remove persistence artifacts and rebuild the endpoint from a known-good image before returning it to service. — Option B is correct because after containment (network isolation and memory preservation), the best eradication step is to remove all persistence mechanisms (startup item and scheduled task) and rebuild the endpoint from a known-good image. This ensures that any undetected malware remnants, rootkits, or hidden artifacts are eliminated, preventing reinfection. Simply deleting files or changing DNS does not guarantee the system is clean, and reconnecting without a full rebuild risks lateral movement or data exfiltration.
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
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 →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This SY0-701 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SY0-701 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.