The answer is to verify if any accounts were successfully compromised, as this is the critical first step after brute force detection. Before taking any containment actions like blocking the IP or disabling accounts, the analyst must assess the actual impact by reviewing authentication logs for successful logins that followed the failed attempts. This prioritizes impact assessment over immediate response, a core principle tested on the ISC2 Certified in Cybersecurity CC exam, where the common trap is jumping to block the attacker’s IP—an action that can destroy forensic evidence and alert the adversary. The question evaluates your understanding of incident response order: confirm compromise first, then contain. A useful memory tip is “Check before you block”—always verify account breach before taking irreversible steps.
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 SOC analyst detects a series of failed login attempts from a single external IP address targeting multiple user accounts within a short time. Which action should the analyst take FIRST?
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 if any accounts were successfully compromised.
The correct first step is to verify if any accounts were successfully compromised (Option B). In security operations, the priority is to assess the impact of an incident before taking containment actions. If an account was breached, immediate password resets and session invalidation are needed; blocking the IP prematurely could destroy forensic evidence and alert the attacker, while disabling all accounts causes unnecessary business disruption. The analyst must confirm compromise via log review (e.g., checking for successful authentication events after the failed attempts) to guide the appropriate response.
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.
✗
Block the IP address at the firewall immediately.
Why it's wrong here
Blocking prematurely may disrupt legitimate traffic and should be done after verification.
✓
Verify if any accounts were successfully compromised.
Why this is correct
This assesses immediate impact and guides next steps.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Disable all user accounts that were targeted.
Why it's wrong here
Disabling accounts without confirmation of compromise would disrupt productivity.
✗
Notify law enforcement about the attempted breach.
Why it's wrong here
Law enforcement is contacted after internal investigation and confirmed breach.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the principle that containment (e.g., blocking an IP) should not be performed before verifying impact, because the first priority in incident response is to confirm whether a breach actually occurred, not to assume the worst and disrupt operations.
Detailed technical explanation
How to think about this question
Under the hood, failed login attempts generate Windows Security Event ID 4625 (or syslog auth failures on Linux), while successful logins generate Event ID 4624. The analyst should correlate the source IP with successful authentication events within the same time window to detect a password spray attack. In real-world scenarios, attackers often use low-and-slow techniques to avoid lockout thresholds, so the analyst must also check for subsequent successful logins from the same IP across different accounts, which indicates a successful credential compromise.
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 if any accounts were successfully compromised. — The correct first step is to verify if any accounts were successfully compromised (Option B). In security operations, the priority is to assess the impact of an incident before taking containment actions. If an account was breached, immediate password resets and session invalidation are needed; blocking the IP prematurely could destroy forensic evidence and alert the attacker, while disabling all accounts causes unnecessary business disruption. The analyst must confirm compromise via log review (e.g., checking for successful authentication events after the failed attempts) to guide the appropriate response.
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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