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 identifies a suspicious file that appears to be a Windows executable. Using PEiD, the analyst detects the file is packed with UPX. After unpacking, the analyst runs the file in a sandbox and observes it modifies the following registry key: HKCU\Software\Microsoft\Windows\CurrentVersion\Run\MalService. What behavioural indicator is primarily demonstrated?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Persistence mechanism
The modification of the registry key HKCU\Software\Microsoft\Windows\CurrentVersion\Run\MalService is a classic persistence mechanism. By adding an entry to the Run key, the malware ensures that it executes automatically every time the user logs into the system, maintaining its presence across reboots.
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.
✓
Persistence mechanism
Why this is correct
Adding a value to the Run key ensures persistence.
Related concept
Read the scenario before looking for a memorised answer.
✗
Command and control communication
Why it's wrong here
No network connections or C2 indicators are mentioned.
✗
Anti-forensic technique (timestomping)
Why it's wrong here
Timestomping modifies file timestamps; no such modification is indicated.
✗
Privilege escalation attempt
Why it's wrong here
Privilege escalation would involve techniques like token manipulation; adding a Run key does not escalate privileges.
Common exam traps
Common exam trap: answer the scenario, not the keyword
EC-Council often tests the distinction between persistence and privilege escalation, where candidates mistakenly think modifying HKCU\Run requires administrative rights, but it only requires user-level access and is a persistence technique, not an escalation attempt.
Detailed technical explanation
How to think about this question
The Run registry key is processed by the Windows Logon process (winlogon.exe) via the Userinit and Shell value chain, launching each listed executable under the user's context. In real-world scenarios, malware often uses obfuscated paths or renames itself to blend in, such as 'svchost.exe' in a temp folder, to evade casual inspection. UPX unpacking reveals the original code, but the persistence behavior remains unchanged.
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: Persistence mechanism — The modification of the registry key HKCU\Software\Microsoft\Windows\CurrentVersion\Run\MalService is a classic persistence mechanism. By adding an entry to the Run key, the malware ensures that it executes automatically every time the user logs into the system, maintaining its presence across reboots.
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.
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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