Quick Answer
Amazon GuardDuty is the correct choice because it is a threat detection service that uses machine learning and integrated threat intelligence to identify anomalous behavior, such as an IAM access key being used from an unusual geographic location. It specifically analyzes CloudTrail management and data events, VPC flow logs, and DNS logs to detect credential theft patterns like a new geolocation or an impossible travel scenario, and can trigger alerts via Amazon EventBridge or SNS for automated response. On the AWS Certified Security Specialty SCS-C02 exam, this question tests your understanding of which service handles anomaly-based threat detection versus other security services like AWS Config (which focuses on compliance) or CloudTrail (which only logs events). A common trap is choosing CloudTrail because it records API calls, but GuardDuty is the one that actively analyzes those logs for suspicious patterns. Memory tip: think "GuardDuty guards the door" — it watches for unusual keys entering from strange locations.
This SCS-C02 practice question tests your understanding of threat detection and incident response. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 engineer needs to detect and respond to potential credential theft where an IAM user's access key is being used from an unusual geographic location. Which AWS service should be used to generate alerts based on this anomaly?
AWS IAM Access Analyzer
Why wrong: IAM Access Analyzer reviews resource policies for unintended access, not user behavior.
AWS CloudTrail
Why wrong: CloudTrail records API calls but does not analyze for anomalies or generate alerts.
Amazon GuardDuty
GuardDuty uses ML to detect suspicious API activity, including credential compromise.
AWS Config
Why wrong: AWS Config evaluates resource configurations, not API call patterns.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Amazon GuardDuty
Amazon GuardDuty is the correct choice because it is a threat detection service that uses machine learning and integrated threat intelligence to identify anomalous behavior, such as an IAM access key being used from an unusual geographic location. It specifically analyzes CloudTrail management and data events, VPC flow logs, and DNS logs to detect credential theft patterns like a new geolocation or an impossible travel scenario, and can trigger alerts via Amazon EventBridge or SNS for automated response.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
AWS IAM Access Analyzer
Why it's wrong here
IAM Access Analyzer reviews resource policies for unintended access, not user behavior.
AWS CloudTrail
Why it's wrong here
CloudTrail records API calls but does not analyze for anomalies or generate alerts.
Amazon GuardDuty
Why this is correct
GuardDuty uses ML to detect suspicious API activity, including credential compromise.
Related concept
Read the scenario before looking for a memorised answer.
AWS Config
Why it's wrong here
AWS Config evaluates resource configurations, not API call patterns.
Common exam traps
The trap here is that candidates often confuse AWS CloudTrail's logging capability with active threat detection, assuming that CloudTrail alone can generate alerts for geographic anomalies, when in reality it only provides raw logs that require additional analysis services like GuardDuty or custom solutions to detect and alert on such patterns.
Detailed technical explanation
GuardDuty's anomaly detection for credential theft relies on a machine learning model that establishes a baseline of normal access patterns for each IAM user, including typical geographic locations and times of access. When an access key is used from a new geolocation that deviates significantly from the baseline, GuardDuty generates a finding (e.g., 'UnauthorizedAccess:IAMUser/AnomalousActivity') with details like the source IP address and country, enabling automated incident response via EventBridge rules that can trigger Lambda functions to revoke the key or notify the security team. A subtle behavior is that GuardDuty also considers the velocity of access (e.g., multiple logins from distant locations within a short time) to detect impossible travel, which is a common indicator of credential theft.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
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Threat Detection and Incident Response — study guide chapter
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FAQ
Threat Detection and Incident Response — This question tests Threat Detection and Incident Response — Read the scenario before looking for a memorised answer..
The correct answer is: Amazon GuardDuty — Amazon GuardDuty is the correct choice because it is a threat detection service that uses machine learning and integrated threat intelligence to identify anomalous behavior, such as an IAM access key being used from an unusual geographic location. It specifically analyzes CloudTrail management and data events, VPC flow logs, and DNS logs to detect credential theft patterns like a new geolocation or an impossible travel scenario, and can trigger alerts via Amazon EventBridge or SNS for automated response.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Same concept, more angles
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 engineer is investigating a potential compromise of an IAM user. The engineer sees that the user's access keys were used from an IP address outside the company's allowed geography. Which AWS service can provide the most immediate notification of such anomalous API calls?
mediumWhy B: Amazon GuardDuty is a threat detection service that continuously monitors for malicious or unauthorized behavior, including anomalous API calls from unusual geographies. It uses machine learning and integrated threat intelligence to analyze CloudTrail events, VPC flow logs, and DNS logs in near real-time, enabling immediate notification of suspicious activity such as access key usage from an unexpected IP address.
Last reviewed: Jun 24, 2026
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