The correct answer is to remove persistence, rotate affected credentials, and verify no related hosts remain compromised. This is required before recovery because the incident response process demands full eradication of the threat—here, the scheduled task and stolen service account—to prevent the attacker from simply re-entering the environment after restoration. Rotating credentials ensures the compromised account cannot be reused, while verifying lateral movement confirms the breach hasn’t spread to other systems, aligning with NIST SP 800-61’s recovery phase. On the CompTIA CySA+ CS0-003 exam, this tests your understanding of the eradication step between containment and recovery; a common trap is jumping to recovery immediately after containment, forgetting that persistence and credential reuse must be addressed first. Remember the mnemonic “PRV” for Persistence, Rotate, Verify—if you skip any of these, you’re not ready to recover.
CS0-003 Incident Response and Management Practice Question
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.
After a high-priority SOC escalation, after containing a compromised host, analysis shows persistence through a scheduled task and a stolen service account. What is required before recovery? During containment, which decision is most defensible? which response best matches incident-response practice?
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.
Why wrong: Reconnection before eradication can allow reinfection.
B
Disable logging to improve performance
Why wrong: Logging is critical during recovery validation.
C
Close the incident after isolation
Why wrong: Isolation is containment, not full eradication or recovery.
D
Remove persistence, rotate affected credentials, and verify no related hosts remain compromised
Recovery should follow eradication of persistence and credential exposure. In containment, responders need action that reduces risk while preserving the investigation record.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Remove persistence, rotate affected credentials, and verify no related hosts remain compromised
Option D is correct because after containment, the incident response process requires removing the persistence mechanism (the scheduled task), rotating the stolen service account credentials to prevent re-authentication, and verifying that no other hosts are compromised (lateral movement check). This aligns with the NIST SP 800-61 recovery phase, which mandates eradication before recovery to ensure the threat is fully removed.
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.
✗
Reconnect the host because users need it
Why it's wrong here
Reconnection before eradication can allow reinfection.
✗
Disable logging to improve performance
Why it's wrong here
Logging is critical during recovery validation.
✗
Close the incident after isolation
Why it's wrong here
Isolation is containment, not full eradication or recovery.
✓
Remove persistence, rotate affected credentials, and verify no related hosts remain compromised
Why this is correct
Recovery should follow eradication of persistence and credential exposure. In containment, responders need action that reduces risk while preserving the investigation record.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
CompTIA often tests the misconception that isolation alone is sufficient to close an incident, but the trap here is that persistence and credential theft require active eradication and verification steps before recovery can begin.
Detailed technical explanation
How to think about this question
Under the hood, scheduled tasks on Windows are stored in the Task Scheduler service (svchost.exe) and can be enumerated via schtasks /query or the XML files in %SystemRoot%\System32\Tasks. A stolen service account often has domain-level privileges; rotating its password via Active Directory (using Set-ADAccountPassword) and revoking Kerberos TGTs (using Revoke-AzADUserSignInSession or klist purge) is essential. Verification of no related hosts involves checking event logs (Event ID 4624 for logon events) and network flows for signs of lateral movement, such as SMB or WinRM connections from the compromised host.
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 CS0-003 question in full detail.
Incident Response and Management — This question tests Incident Response and Management — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Remove persistence, rotate affected credentials, and verify no related hosts remain compromised — Option D is correct because after containment, the incident response process requires removing the persistence mechanism (the scheduled task), rotating the stolen service account credentials to prevent re-authentication, and verifying that no other hosts are compromised (lateral movement check). This aligns with the NIST SP 800-61 recovery phase, which mandates eradication before recovery to ensure the threat is fully removed.
What should I do if I get this CS0-003 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. In a regulated payment environment, after containing a compromised host, analysis shows persistence through a scheduled task and a stolen service account. What is required before recovery? During containment, which decision is most defensible? which action best reduces risk without losing evidence?
hard
A.Reconnect the host because users need it
B.Disable logging to improve performance
C.Close the incident after isolation
✓ D.Remove persistence, rotate affected credentials, and verify no related hosts remain compromised
Why D: Option D is correct because after containing a compromised host, the recovery phase requires removing the persistence mechanism (the scheduled task), rotating the stolen service account credentials to prevent re-authentication, and verifying that no other hosts are compromised via lateral movement. This ensures the threat is fully eradicated before returning the host to production, which is critical in a regulated payment environment where PCI DSS or similar standards mandate thorough remediation.
Variation 2. After containing a compromised host, analysis shows persistence through a scheduled task and a stolen service account. What is required before recovery? During containment, which decision is most defensible?
medium
A.Reconnect the host because users need it
B.Disable logging to improve performance
C.Close the incident after isolation
✓ D.Remove persistence, rotate affected credentials, and verify no related hosts remain compromised
Why D: Option D is correct because before recovery, you must remove the persistence mechanism (the scheduled task), rotate the stolen service account credentials to prevent re-entry, and verify that no other hosts are compromised using the same foothold. This ensures the attacker cannot regain access after the host is restored to production, which is a fundamental step in the eradication phase of incident response.
Variation 3. During a post-compromise review, after containing a compromised host, analysis shows persistence through a scheduled task and a stolen service account. What is required before recovery? During containment, which decision is most defensible? which action should be prioritized before closure?
hard
A.Reconnect the host because users need it
B.Disable logging to improve performance
C.Close the incident after isolation
✓ D.Remove persistence, rotate affected credentials, and verify no related hosts remain compromised
Why D: Option D is correct because after containing a compromised host, the recovery phase requires removing the persistence mechanism (the scheduled task), rotating the stolen service account credentials to prevent re-authentication, and verifying that no other hosts are compromised via the same lateral movement path. This ensures the attacker cannot regain access and that the incident is fully remediated before closure.
Variation 4. While supporting a hybrid workforce, after containing a compromised host, analysis shows persistence through a scheduled task and a stolen service account. What is required before recovery? During containment, which decision is most defensible? which evidence should guide the decision?
easy
A.Reconnect the host because users need it
B.Disable logging to improve performance
C.Close the incident after isolation
✓ D.Remove persistence, rotate affected credentials, and verify no related hosts remain compromised
Why D: Option D is correct because before recovery, you must remove the persistence mechanism (the scheduled task) to prevent re-infection, rotate the stolen service account credentials to close the attacker's access, and verify no other hosts are compromised via the same account. This aligns with the NIST SP 800-61 recovery phase, which requires eliminating all footholds and validating the scope of compromise before returning the host to production.
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