- A
TTP-driven hunting by analyzing adversary behaviors mapped to the ATT&CK framework
Why wrong: TTP-driven hunting is similar but broader; the scenario specifically starts with a hypothesis about a technique, which is more aligned with hypothesis-driven hunting.
- B
Hypothesis-driven hunting based on a specific technique (process injection) and searching for evidence in memory and process activity
Hypothesis-driven hunting starts with a hypothesis about adversary behavior and proactively searches for evidence, making it ideal for detecting novel or evasive techniques.
- C
Automated hunting using SIEM correlation rules that trigger on known malicious file hashes
Why wrong: This is reactive and signature-based; it would miss novel attacks that do not match known hashes.
- D
IoC-driven hunting using known indicators of compromise from open-source feeds
Why wrong: IoC-driven hunting relies on known IOCs, which an APT may not have left behind; it is reactive.
CAS-004 Security Operations Practice Question
This CAS-004 practice question tests your understanding of security operations. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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 analyst is investigating a potential advanced persistent threat (APT) that has evaded traditional signature-based defenses. The analyst hypothesizes that the attacker is using a specific technique from the MITRE ATT&CK framework: process injection. Which threat hunting methodology is most appropriate for this scenario?
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
Hypothesis-driven hunting based on a specific technique (process injection) and searching for evidence in memory and process activity
Hypothesis-driven hunting starts with a specific hypothesis based on threat intelligence or a known TTP, such as process injection. This approach is proactive and focuses on detecting behaviors consistent with the hypothesis, unlike IoC-driven hunting which relies on known indicators.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
TTP-driven hunting by analyzing adversary behaviors mapped to the ATT&CK framework
Why it's wrong here
TTP-driven hunting is similar but broader; the scenario specifically starts with a hypothesis about a technique, which is more aligned with hypothesis-driven hunting.
- ✓
Hypothesis-driven hunting based on a specific technique (process injection) and searching for evidence in memory and process activity
Why this is correct
Hypothesis-driven hunting starts with a hypothesis about adversary behavior and proactively searches for evidence, making it ideal for detecting novel or evasive techniques.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
Automated hunting using SIEM correlation rules that trigger on known malicious file hashes
Why it's wrong here
This is reactive and signature-based; it would miss novel attacks that do not match known hashes.
- ✗
IoC-driven hunting using known indicators of compromise from open-source feeds
Why it's wrong here
IoC-driven hunting relies on known IOCs, which an APT may not have left behind; it is reactive.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Trap categories for this question
Similar concept trap
TTP-driven hunting is similar but broader; the scenario specifically starts with a hypothesis about a technique, which is more aligned with hypothesis-driven hunting.
Scenario analysis trap
TTP-driven hunting is similar but broader; the scenario specifically starts with a hypothesis about a technique, which is more aligned with hypothesis-driven hunting.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CAS-004 NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this CAS-004 question test?
Security Operations — This question tests Security Operations — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Hypothesis-driven hunting based on a specific technique (process injection) and searching for evidence in memory and process activity — Hypothesis-driven hunting starts with a specific hypothesis based on threat intelligence or a known TTP, such as process injection. This approach is proactive and focuses on detecting behaviors consistent with the hypothesis, unlike IoC-driven hunting which relies on known indicators.
What should I do if I get this CAS-004 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related CAS-004 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jul 4, 2026
This CAS-004 practice question is part of Courseiva's free CompTIA 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 CAS-004 exam.
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