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.
During a malware investigation, an analyst uses Process Monitor to observe a suspicious executable. The tool reveals that the process attempts to write to 'HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run' and creates a file named 'svchost.exe' in 'C:\Users\Public\'. What is the MOST likely goal of this behavior?
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.
Why wrong: No network activity is mentioned; the behavior is local persistence.
B
Establishing persistence by adding an auto-start entry
The Run registry key is a standard auto-start location, ensuring the malware executes on user logon.
C
Disabling security software by modifying service entries
Why wrong: No indication of modification to security software; the Run key is for auto-start.
D
Privilege escalation by masquerading as a legitimate system process
Why wrong: Creating a file named svchost.exe may be masquerading, but the registry write to Run is primarily for persistence, not privilege escalation.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Establishing persistence by adding an auto-start entry
Writing to the 'Run' registry key (HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run) is a classic persistence mechanism: any executable listed there is automatically launched at user logon. Creating a file named 'svchost.exe' in a public directory is a masquerading attempt to blend in with the legitimate svchost.exe (which resides in System32), but the registry write is the definitive indicator of persistence via an auto-start entry.
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.
✗
Exfiltrating data to a remote C2 server
Why it's wrong here
No network activity is mentioned; the behavior is local persistence.
✓
Establishing persistence by adding an auto-start entry
Why this is correct
The Run registry key is a standard auto-start location, ensuring the malware executes on user logon.
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.
✗
Disabling security software by modifying service entries
Why it's wrong here
No indication of modification to security software; the Run key is for auto-start.
✗
Privilege escalation by masquerading as a legitimate system process
Why it's wrong here
Creating a file named svchost.exe may be masquerading, but the registry write to Run is primarily for persistence, not privilege escalation.
Common exam traps
Common exam trap: answer the scenario, not the keyword
EC-Council often tests the distinction between persistence (Run key) and privilege escalation (e.g., service path hijacking or token theft) — candidates confuse masquerading as a system process with actually gaining higher privileges, but the Run key write only ensures the malware runs at logon, not with elevated rights.
Detailed technical explanation
How to think about this question
The Run registry key is processed by the Winlogon process via the Shell value; each entry is launched with the user's privileges. Malware often names itself 'svchost.exe' to evade casual inspection, but the real svchost.exe is a critical system process located in C:\Windows\System32 — a copy in C:\Users\Public\ is anomalous and can be detected by file path whitelisting. In real-world incidents, this combination is frequently used by trojans like Emotet or TrickBot to survive reboots.
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 junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
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: Establishing persistence by adding an auto-start entry — Writing to the 'Run' registry key (HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run) is a classic persistence mechanism: any executable listed there is automatically launched at user logon. Creating a file named 'svchost.exe' in a public directory is a masquerading attempt to blend in with the legitimate svchost.exe (which resides in System32), but the registry write is the definitive indicator of persistence via an auto-start entry.
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: "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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