The correct answer is credential theft or session hijacking. This SIEM rule detects impossible travel, a scenario where a user authenticates from two geographically distant locations within a timeframe too short for physical travel, which strongly indicates stolen credentials or a hijacked session. The SIEM correlates authentication logs with IP geolocation data to flag this anomaly, making it a key indicator of an active credential theft attack. On the ISC2 Certified in Cybersecurity CC exam, this concept tests your understanding of how SIEM rules detect behavioral anomalies rather than signature-based threats; a common trap is confusing this with a brute-force attack, which focuses on repeated login failures, not geographic impossibility. Remember the memory tip: "If they can't fly, they're lying"—impossible travel means the user's identity has been compromised.
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.
An organization uses a SIEM to correlate logs from multiple sources. A rule triggers when a user logs in from two geographically distant locations within a short time. What type of attack does this rule primarily detect?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Credential theft or session hijacking
The SIEM rule detects impossible travel — a user authenticating from two geographically distant locations within a time window too short for physical travel. This behavior strongly indicates that an attacker has stolen the user's credentials (credential theft) or taken over an active session (session hijacking) and is using them from a different location. The SIEM correlates authentication logs (e.g., from Active Directory, VPN, or web apps) with geolocation data (IP-to-location mapping) to flag this anomaly.
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.
✗
Denial of service attack
Why it's wrong here
DoS attacks target availability, not authentication anomalies.
✗
Brute-force attack
Why it's wrong here
Brute-force attacks involve many failed attempts, not successful logins from disparate locations.
✓
Credential theft or session hijacking
Why this is correct
Logins from impossible travel locations indicate that credentials may be used by an attacker.
Related concept
Read the scenario before looking for a memorised answer.
✗
Man-in-the-middle attack
Why it's wrong here
MITM attacks intercept communications; they do not necessarily cause multiple logins from different locations.
Common exam traps
Common exam trap: answer the scenario, not the keyword
ISC2 often tests the concept of 'impossible travel' as a specific indicator of credential theft or session hijacking, and candidates mistakenly associate any unusual login pattern with brute-force attacks, failing to recognize that brute-force focuses on failed attempts, not successful logins from distant locations.
Detailed technical explanation
How to think about this question
Under the hood, the SIEM calculates the great-circle distance between the two IP geolocations and divides by the time difference to estimate travel speed; if the speed exceeds a threshold (e.g., >500 mph), it triggers an alert. Real-world scenarios often involve attackers using stolen session tokens (e.g., from a cookie or OAuth token) to replay the session from a different IP, bypassing MFA. This rule is a classic example of user and entity behavior analytics (UEBA) applied to authentication logs.
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 security analyst at a medium-sized enterprise encounters this scenario during an investigation or architecture review. The correct answer reflects best practice for the specific threat or control described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Security exam questions test whether you can match controls to threats in context — not just recall definitions.
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: Credential theft or session hijacking — The SIEM rule detects impossible travel — a user authenticating from two geographically distant locations within a time window too short for physical travel. This behavior strongly indicates that an attacker has stolen the user's credentials (credential theft) or taken over an active session (session hijacking) and is using them from a different location. The SIEM correlates authentication logs (e.g., from Active Directory, VPN, or web apps) with geolocation data (IP-to-location mapping) to flag this anomaly.
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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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