312-39 Cyber Threats Iocs And Attack Methodology Practice Question
A SOC analyst is reviewing logs in a SIEM and notices multiple failed login attempts followed by a successful one from an unknown IP. Which specific IoC category does this activity represent?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Unauthorized access attempt
This behavior is a classic indicator of a brute-force attack or credential stuffing attempt.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Data exfiltration indicator
Why it's wrong here
This typically involves unusual outbound traffic volume.
- ✓
Unauthorized access attempt
Why this is correct
Failed logins followed by success is a common IoC for unauthorized access.
- ✗
Network anomaly signature
Why it's wrong here
This is a behavior pattern, not a signature.
- ✗
System resource exhaustion
Why it's wrong here
This relates to DoS attacks, not authentication events.
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This 312-39 question is part of Courseiva's 202-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed August 2026 · checked against the official EC-Council exam blueprint
This 312-39 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 312-39 exam.