The answer is that an attacker is attempting to brute-force the user's password. Event ID 4625 specifically logs a failed logon attempt, and when the Windows Security log shows multiple such failures for the same user account from a single remote IP address within a short time frame, it is the classic signature of a brute-force attack. On the Computer Hacking Forensic Investigator CHFI exam, this scenario tests your ability to correlate raw event data with attack patterns, distinguishing automated password guessing from isolated user errors or network latency issues. A common trap is confusing Event ID 4625 with Event ID 4624 (successful logon) or assuming the failures are due to a forgotten password, but the repetition and single source IP are the key indicators. Remember the mnemonic: 4625 Failures, Five Guesses—multiple failures from one IP mean brute force is in progress.
CHFI OS and Network Forensics Practice Question
This CHFI practice question tests your understanding of os and network forensics. 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 security analyst reviews Windows Event Logs and sees Event ID 4625 multiple times for a single user account from a remote IP address within a short time frame. What is the MOST likely interpretation?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
An attacker is attempting to brute-force the user's password
Event ID 4625 indicates a failed logon attempt. Multiple occurrences from the same remote IP suggest a brute-force password guessing attack.
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.
✗
The user successfully logged on from multiple locations
Why it's wrong here
Event ID 4625 is for failed logon, not successful.
✓
An attacker is attempting to brute-force the user's password
Why this is correct
Multiple failed logon attempts from a single IP indicate a brute-force attack.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The system is experiencing a denial-of-service attack
Why it's wrong here
Event ID 4625 is specific to failed logons, not DoS.
✗
A service installed itself on the system
Why it's wrong here
Service installation is Event ID 7045.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 practitioner preparing for the CHFI exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CHFI question in full detail.
Identify which CHFI exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
OS and Network Forensics — This question tests OS and Network Forensics — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: An attacker is attempting to brute-force the user's password — Event ID 4625 indicates a failed logon attempt. Multiple occurrences from the same remote IP suggest a brute-force password guessing attack.
What should I do if I get this CHFI question wrong?
Identify which CHFI exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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 →
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. A security analyst reviews Windows Security Event Log and observes Event ID 4625 repeatedly for a single user account from a remote IP address within a short timeframe. What is the MOST likely cause?
easy
A.The user successfully logged on from a remote workstation
✓ B.A brute-force password attack is occurring against that account
C.The user's account was created
D.A service was installed on the system
Why B: Event ID 4625 indicates a failed logon attempt. Repeated failures from a remote IP suggest a brute-force password guessing attack.
Variation 2. A security analyst reviews Windows Security Event Log and finds multiple Event ID 4625 entries for a single user account within a few seconds. What does this pattern MOST likely indicate?
easy
A.Service installation
B.Account creation
✓ C.Brute-force password attack
D.Successful logon by the user
Why C: Event ID 4625 indicates a failed logon attempt. Multiple rapid failures suggest a brute-force password guessing attack.
Variation 3. A security analyst is reviewing Windows Event Logs and notices multiple Event ID 4625 entries for a single user account within a short time frame. What does this most likely indicate?
easy
A.Successful user logins
B.Account creation events
✓ C.A brute-force password guessing attack
D.Service installation
Why C: Event ID 4625 indicates a failed logon attempt. Multiple such events for the same user in a short period strongly suggest a brute-force password guessing attack.
Last reviewed: Jun 21, 2026
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This CHFI practice question is part of Courseiva's free EC-Council 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 CHFI exam.
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