The answer is that the IAM role credentials have been stolen and are being used from an external machine. This is correct because CloudTrail logs record the source IP of every API call, and when an EC2 instance with an IAM role makes legitimate requests, those calls originate from the instance’s internal or associated public IP—not an external address. Seeing an external IP for a compromised IAM role directly indicates that the temporary security credentials from the instance metadata were exfiltrated and reused elsewhere, bypassing the EC2 environment entirely. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding of how CloudTrail source IPs reveal credential misuse, and a common trap is assuming the bucket policy alone would block the access—it won’t, because the policy grants access to the role, not a specific IP. Memory tip: “External IP equals external use—credentials aren’t tied to a machine, only to the role.”
SCS-C02 Security Logging and Monitoring Practice Question
This SCS-C02 practice question tests your understanding of security logging and monitoring. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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 is investigating a potential data exfiltration incident. They see that an EC2 instance with an IAM role is making API calls to S3 to download objects. The IAM role has an S3 bucket policy that allows access from that role. However, CloudTrail logs show that the calls are being made from an IP address outside the company's network. What is the most likely explanation?
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
✓
The IAM role credentials were stolen and are being used from an external machine.
The correct answer is A because the CloudTrail logs show the API calls originating from an IP address outside the company's network, which indicates that the IAM role credentials (temporary security credentials from the instance metadata) have been compromised and are being used from an external machine. The S3 bucket policy allows access from the IAM role, but the source IP in the logs is external, confirming the credentials are being used outside the EC2 instance.
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 IAM role credentials were stolen and are being used from an external machine.
Why this is correct
Stolen credentials can be used from anywhere; the source IP in CloudTrail reflects the actual client IP.
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 EC2 instance has a public IP and the calls are originating from the instance itself.
Why it's wrong here
If the calls were from the instance, the source IP would be the instance's public or private IP, not an external IP.
✗
CloudTrail is logging the IP address of the AWS service endpoint, not the client.
Why it's wrong here
CloudTrail logs the source IP address of the requester, not the service endpoint.
✗
The S3 bucket policy allows public access.
Why it's wrong here
Public access would allow anyone, but the calls are made with the IAM role credentials, not anonymously.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may assume the external IP is due to a NATgateway or AWS service endpoint, but CloudTrail always logs the actual client IP, not the service endpoint IP.
Detailed technical explanation
How to think about this question
Under the hood, IAM roles for EC2 provide temporary credentials via the instance metadata service (IMDS) at http://169.254.169.254/latest/meta-data/iam/security-credentials/. If these credentials are exfiltrated (e.g., via SSRF or malware), they can be used from any machine until they expire (default 6 hours). CloudTrail records the source IP of the API caller, so an external IP in the logs is a strong indicator of credential theft.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Security Logging and Monitoring — This question tests Security Logging and Monitoring — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The IAM role credentials were stolen and are being used from an external machine. — The correct answer is A because the CloudTrail logs show the API calls originating from an IP address outside the company's network, which indicates that the IAM role credentials (temporary security credentials from the instance metadata) have been compromised and are being used from an external machine. The S3 bucket policy allows access from the IAM role, but the source IP in the logs is external, confirming the credentials are being used outside the EC2 instance.
What should I do if I get this SCS-C02 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: "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.
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Question Discussion
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