The correct immediate actions for dynamic malware analysis are to isolate the host from the network, monitor process creation and file system activity with Process Monitor, and capture a memory dump for analysis. This is correct because the observed behavior—repeated connections to 192.168.1.100 on TCP port 4444, a classic Metasploit reverse shell port, combined with a DLL write to C:\Users\Public—indicates active command-and-control (C2) communication and potential persistence. Isolating the host stops data exfiltration and lateral movement, while Process Monitor captures real-time file and registry changes, and a memory dump preserves volatile evidence of the running malicious process. On the CHFI exam, this scenario tests your ability to prioritize containment and evidence preservation during dynamic analysis, a core forensic principle. A common trap is jumping to network traffic analysis without first isolating the host, which risks losing the malware sample. Memory tip: “Isolate, Monitor, Dump” to remember the three-step containment-first approach.
CHFI Mobile and Malware Forensics Practice Question
This CHFI practice question tests your understanding of mobile and malware forensics. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 observes a process making repeated network connections to an IP address 192.168.1.100 on TCP port 4444, and the process writes a DLL file to C:\Users\Public\. Which THREE actions should the analyst take immediately as part of dynamic analysis?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Isolate the host from the network to prevent further C2 communication
Option A is correct because isolating the host from the network immediately stops the ongoing C2 communication to 192.168.1.100 on TCP port 4444, which is a common port for reverse shells (e.g., Metasploit). This containment prevents further data exfiltration, lateral movement, or command execution by the attacker, and is a critical first step in dynamic analysis to preserve the integrity of the investigation.
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.
✓
Isolate the host from the network to prevent further C2 communication
Why this is correct
Isolation stops the malware from communicating and spreading.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✓
Capture a memory dump using FTK Imager or similar
Why this is correct
Memory capture preserves volatile evidence like running processes and network connections.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Delete the DLL file to stop the malware
Why it's wrong here
Deleting the file may alter evidence and may not stop the malware if it's already running.
✓
Monitor process creation and file system activity with Process Monitor
Why this is correct
Process Monitor provides real-time insight into the malware's behavior.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Reimage the hard drive to remove the malware
Why it's wrong here
Reimaging destroys evidence; analysis should be performed on the original drive.
Common exam traps
Common exam trap: answer the scenario, not the keyword
EC-Council often tests the distinction between immediate dynamic analysis actions (containment, monitoring, memory capture) versus destructive or premature remediation steps (deleting files, reimaging), and the trap here is that candidates mistakenly choose to delete the DLL or reimage the drive, thinking it will stop the malware, when in fact it destroys evidence and bypasses the forensic process.
Detailed technical explanation
How to think about this question
TCP port 4444 is the default listener port for Metasploit's Meterpreter reverse TCP payload, and the DLL being written to C:\Users\Public\ is a common persistence mechanism (e.g., a reflective DLL injection or a DLL side-loading attack). Dynamic analysis focuses on observing live behavior—such as process creation, registry changes, and network traffic—using tools like Process Monitor (ProcMon) and memory capture (FTK Imager) to understand the malware's runtime characteristics without altering the system state.
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 practitioner preparing for the CHFI exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CHFI question in full detail.
Mobile and Malware Forensics — This question tests Mobile and Malware Forensics — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Isolate the host from the network to prevent further C2 communication — Option A is correct because isolating the host from the network immediately stops the ongoing C2 communication to 192.168.1.100 on TCP port 4444, which is a common port for reverse shells (e.g., Metasploit). This containment prevents further data exfiltration, lateral movement, or command execution by the attacker, and is a critical first step in dynamic analysis to preserve the integrity of the investigation.
What should I do if I get this CHFI 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: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
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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