Quick Answer
The correct answer is to verify that persistence mechanisms are removed, because any lingering autorun entries, scheduled tasks, or registry modifications would allow the malware to re-establish itself immediately after restoration. This step is critical because restoring from a backup that appears clean but still harbors hidden persistence hooks will simply re-infect the environment, undoing all eradication efforts. On the CompTIA CySA+ CS0-003 exam, this concept tests your understanding of the recovery phase within the incident response process, where the common trap is assuming that a backup is automatically safe without validation. A strong memory tip is to think of the “three V’s” before any restore: Verify the backup is clean, Verify it is restorable, and Verify no persistence remains on the current system.
This CS0-003 practice question tests your understanding of incident response and management. 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.
Which actions are appropriate before restoring systems after malware eradication? (Choose two.)
Disable all monitoring during restoration
Why wrong: Monitoring helps detect recurrence.
Reuse known-compromised credentials
Why wrong: Compromised credentials should be rotated.
Validate backups are clean and restorable
Recovery depends on trustworthy backups.
Verify persistence mechanisms are removed
Restoration before removing persistence can lead to reinfection.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Validate backups are clean and restorable
Option C is correct because restoring from backups that are themselves infected or corrupted would reintroduce the malware or cause system instability. Before restoration, backups must be validated as clean (e.g., scanned with updated antivirus or checked against known file hashes) and restorable (e.g., tested via a restore dry-run or checksum verification). This ensures the recovery process does not perpetuate the incident.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Disable all monitoring during restoration
Why it's wrong here
Monitoring helps detect recurrence.
Reuse known-compromised credentials
Why it's wrong here
Compromised credentials should be rotated.
Validate backups are clean and restorable
Why this is correct
Recovery depends on trustworthy backups.
Related concept
Read the scenario before looking for a memorised answer.
Verify persistence mechanisms are removed
Why this is correct
Restoration before removing persistence can lead to reinfection.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Cisco often tests the misconception that restoring from backups is a straightforward 'plug-and-play' step, but the trap here is that candidates forget to validate backup integrity and to eliminate persistence mechanisms, leading to re-infection or incomplete recovery.
Detailed technical explanation
During restoration, persistence mechanisms such as scheduled tasks, registry Run keys, or WMI event subscriptions must be verified as removed because malware often installs multiple persistence points that survive a simple file-level restore. For example, a rootkit might hook system calls in the Master Boot Record (MBR) or use a driver to re-infect after reboot; scanning with tools like Autoruns or checking for hidden processes via `ps -ef` on Linux ensures these footholds are eliminated. In a real-world scenario, the NotPetya outbreak showed that restoring from backups without first removing lateral movement artifacts led to rapid re-infection across the network.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A security team runs a vulnerability scan on a web application and discovers an unpatched SQL injection flaw. The team prioritises remediation by CVSS score — critical flaws are patched within 24 hours, high within 7 days. Questions like this test whether you understand vulnerability management processes, scanning tools, and remediation prioritisation.
What to study next
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Incident Response and Management — study guide chapter
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FAQ
Incident Response and Management — This question tests Incident Response and Management — Read the scenario before looking for a memorised answer..
The correct answer is: Validate backups are clean and restorable — Option C is correct because restoring from backups that are themselves infected or corrupted would reintroduce the malware or cause system instability. Before restoration, backups must be validated as clean (e.g., scanned with updated antivirus or checked against known file hashes) and restorable (e.g., tested via a restore dry-run or checksum verification). This ensures the recovery process does not perpetuate the incident.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This CS0-003 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 CS0-003 exam.
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