The answer is the Run key persistence mechanism. This is correct because the malware process 'svch0st.exe' writes to the registry key HKCU\Software\Microsoft\Windows\CurrentVersion\Run, which is a standard Windows location that automatically launches any referenced executable each time the user logs on. The mutex 'Global\Mutex_1234' is a separate anti-reinfection technique to prevent multiple instances, but the persistence itself is established solely through that Run key. On the Computer Hacking Forensic Investigator CHFI exam, this scenario tests your ability to distinguish between common persistence methods and supporting artifacts; a common trap is confusing the mutex creation with the persistence mechanism itself. Remember the memory tip: if it writes to Run or RunOnce, it’s Run key persistence—the mutex is just a lock, not the door.
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 suspects malware infection on a Windows workstation. They run Process Monitor and observe that a process named 'svch0st.exe' creates a mutex named 'Global\Mutex_1234' and writes to the registry key 'HKCU\Software\Microsoft\Windows\CurrentVersion\Run'. Which malware persistence mechanism is being used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Run key persistence
The process 'svch0st.exe' writes to the registry key 'HKCU\Software\Microsoft\Windows\CurrentVersion\Run', which is a classic Run key used for automatic program execution at user logon. This is the most common malware persistence mechanism, as any executable referenced there will start each time the user logs in. The creation of a mutex named 'Global\Mutex_1234' is a common anti-reinfection technique to ensure only one instance of the malware runs, but the persistence is established via the Run key.
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.
✗
Scheduled task creation
Why it's wrong here
Scheduled tasks are created via schtasks.exe or Task Scheduler GUI, not directly via Run key.
✗
Service installation
Why it's wrong here
Service installation uses HKLM\System\CurrentControlSet\Services, not Run key.
✗
DLL search order hijacking
Why it's wrong here
DLL hijacking involves placing a malicious DLL in a directory searched before the legitimate one, not writing to Run key.
✓
Run key persistence
Why this is correct
The Run registry key is a common persistence location for malware to launch on user logon.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
EC-Council often tests the distinction between user-level persistence (HKCU Run key) and system-level persistence (HKLM Run key or service installation), and candidates may confuse the 'Run' key with scheduled tasks or services because all three can launch executables at startup.
Detailed technical explanation
How to think about this question
The Run key in 'HKCU' is per-user, meaning the malware will only persist for the currently logged-in user, not system-wide. Malware often combines this with a mutex (e.g., 'Global\Mutex_1234') to prevent multiple infections, which can be detected by forensic tools like Process Monitor or Volatility by filtering for 'Mutex' operations. In real-world scenarios, analysts can use Autoruns to identify such entries, and the mutex name can be used as an IOC (Indicator of Compromise) for threat hunting across multiple hosts.
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: Run key persistence — The process 'svch0st.exe' writes to the registry key 'HKCU\Software\Microsoft\Windows\CurrentVersion\Run', which is a classic Run key used for automatic program execution at user logon. This is the most common malware persistence mechanism, as any executable referenced there will start each time the user logs in. The creation of a mutex named 'Global\Mutex_1234' is a common anti-reinfection technique to ensure only one instance of the malware runs, but the persistence is established via the Run key.
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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