The answer is that the firewall log indicates a potential reverse shell or malware beaconing from host 10.0.1.15. This conclusion is correct because the log reveals an outbound connection from an internal host to an external server on a high ephemeral port like 4444, which is a classic signature of command-and-control (C2) traffic or a reverse shell payload. Such outbound beaconing bypasses typical inbound firewall rules and strongly suggests the internal host is compromised, making it a critical risk indicator for IT risk identification. On the CRISC exam, this scenario tests your ability to distinguish between benign outbound traffic and malicious beaconing patterns, a common trap where candidates focus only on inbound threats. Remember the memory tip: “Outbound on high ports? Think C2 or reverse shell—don’t let the direction fool you.”
CRISC IT Risk Identification Practice Question
This CRISC practice question tests your understanding of it risk identification. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
There is evidence of a potential reverse shell or malware beaconing from host 10.0.1.15
Option D is correct because the firewall log shows an outbound connection from internal host 10.0.1.15 to external server 203.0.113.50 on a high ephemeral port (e.g., 4444), which is commonly associated with reverse shell payloads or malware command-and-control (C2) beaconing. This pattern indicates that the internal host may have been compromised and is establishing an outbound channel to an external attacker, bypassing typical inbound firewall rules. Such behavior is a critical risk indicator for IT risk identification, as it suggests active malicious activity within the network.
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.
✗
External server 198.51.100.20 is attempting to exploit host 10.0.1.10
Why it's wrong here
The ALLOW entry is from internal to external, not external to internal.
✗
Host 10.0.1.15 is successfully communicating with external server 203.0.113.50
Why it's wrong here
All attempts were denied, so no successful communication.
✗
The firewall is functioning correctly with no security incidents
Why it's wrong here
Denied outbound attempts are suspicious and indicate potential incident.
✓
There is evidence of a potential reverse shell or malware beaconing from host 10.0.1.15
Why this is correct
Denied outbound traffic from internal host to external IP on common malware ports indicates possible compromise.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates focus on the source/destination IPs and assume any outbound connection is benign, overlooking the significance of the destination port (4444) as a common reverse shell indicator, which ISACA often uses to test understanding of outbound threat patterns versus simple inbound attack detection.
Detailed technical explanation
How to think about this question
Reverse shells typically use outbound TCP connections from the victim to the attacker on ports like 4444, 8080, or 31337, which are not commonly used by legitimate services; the firewall log showing a SYN-ACK handshake on such a port confirms the connection was established. Malware beaconing often involves periodic outbound connections to external IPs on non-standard ports, which can evade detection if only inbound rules are monitored. In real-world scenarios, attackers use encrypted tunnels (e.g., over HTTPS on port 443) to blend in, but a raw TCP connection on port 4444 is a classic red flag for incident response teams.
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 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
IT Risk Identification — This question tests IT Risk Identification — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: There is evidence of a potential reverse shell or malware beaconing from host 10.0.1.15 — Option D is correct because the firewall log shows an outbound connection from internal host 10.0.1.15 to external server 203.0.113.50 on a high ephemeral port (e.g., 4444), which is commonly associated with reverse shell payloads or malware command-and-control (C2) beaconing. This pattern indicates that the internal host may have been compromised and is establishing an outbound channel to an external attacker, bypassing typical inbound firewall rules. Such behavior is a critical risk indicator for IT risk identification, as it suggests active malicious activity within the network.
What should I do if I get this CRISC 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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This CRISC practice question is part of Courseiva's free ISACA 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 CRISC exam.
Question Discussion
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