The correct first action in ransomware recovery is to verify the integrity and availability of the backup data. This step is critical because if the backup itself is encrypted or compromised by the ransomware, restoring it would simply re-infect the environment, making the recovery effort futile. Technically, you must confirm that the backup is a clean, uncorrupted copy from a point in time before the attack, which aligns with the 3-2-1 backup rule—three copies, two different media, one offsite. On the ISC2 Certified in Cybersecurity CC exam, this question tests your understanding of the incident response and recovery phase, specifically the priority of ensuring a safe restore point before any action. A common trap is jumping straight to restoration or containment, but the exam emphasizes that verification comes first. Remember the memory tip: “Verify before you restore, or you’ll be back at square one.”
ISC2 CC Security Operations Practice Question
This CC 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.
A company experiences a ransomware attack that encrypts all files on a critical server. The backup strategy includes nightly backups stored on a separate network. What should be the first action during recovery?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Verify the integrity and availability of the backup data.
Option C is correct because before any recovery action, you must verify that the backup data is intact, uncorrupted, and free from the ransomware. If the backup itself is encrypted or compromised, restoring it would re-infect the environment. This step aligns with the 3-2-1 backup rule and ensures the recovery point is clean.
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.
✗
Restore all files from the most recent backup.
Why it's wrong here
Must verify backups are clean and system is isolated first.
✗
Isolate the affected server from the network.
Why it's wrong here
Should have been done during containment; recovery step assumes it's already isolated.
✓
Verify the integrity and availability of the backup data.
Why this is correct
Ensures the backup is not compromised before restoring.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Report the incident to law enforcement.
Why it's wrong here
Reporting is important but not the first recovery action.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the misconception that the first recovery step is to restore data, but the trap is that you must first confirm the backup is clean to avoid restoring the ransomware itself.
Detailed technical explanation
How to think about this question
Under the hood, ransomware often has a dwell time before encryption begins, so a backup taken hours before detection might still contain clean data. Verifying backup integrity involves checking checksums (e.g., SHA-256 hashes) and performing a test restore in an isolated sandbox to confirm no encryption artifacts exist. In real-world scenarios, attackers may also target backup repositories, so verifying that the backup is on an air-gapped or immutable storage is critical.
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 CC 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: Verify the integrity and availability of the backup data. — Option C is correct because before any recovery action, you must verify that the backup data is intact, uncorrupted, and free from the ransomware. If the backup itself is encrypted or compromised, restoring it would re-infect the environment. This step aligns with the 3-2-1 backup rule and ensures the recovery point is clean.
What should I do if I get this CC 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: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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