CAS-004 Security Operations Practice Question
A security analyst is reviewing threat intelligence feeds and notices indicators from a known APT group. Which threat intelligence sharing standard is most commonly used to structure and share such cyber threat information in a machine-readable format?
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
✓
STIX/TAXII
STIX (Structured Threat Information Expression) and TAXII (Trusted Automated Exchange of Intelligence Information) are the standard protocols for sharing cyber threat intelligence in a structured, machine-readable format. STIX defines the data model, and TAXII defines the transport mechanism.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
CybOX
Why it's wrong here
CybOX is a language for specifying cyber observables but is part of the STIX framework; STIX/TAXII is the overall standard.
- ✗
MITRE ATT&CK
Why it's wrong here
MITRE ATT&CK is a knowledge base of adversary tactics and techniques, not a sharing standard.
- ✓
STIX/TAXII
Why this is correct
STIX and TAXII are the standard protocols for sharing cyber threat intelligence in a structured, machine-readable format.
- ✗
OpenIOC
Why it's wrong here
OpenIOC is a format for sharing indicators of compromise but is not the primary standard for full threat intelligence sharing; STIX/TAXII is the industry standard.
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