- A
The malware is performing privilege escalation by exploiting a known vulnerability.
Why wrong: Mutex and Run registry key are not directly related to privilege escalation.
- B
The malware is communicating with a command-and-control server to receive further instructions.
Why wrong: Network communication would be detected separately; mutex and registry do not directly indicate C2.
- C
The malware is attempting to hide its presence by using a system mutex name and a legitimate registry location.
Why wrong: While the actions are suspicious, they are not primarily for hiding; they indicate persistence and single-instance control.
- D
The malware is establishing persistence and ensuring only one instance of itself runs.
The Run registry key provides persistence, and the mutex prevents multiple instances.
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 analysis, an analyst runs a suspicious executable in a Cuckoo Sandbox and observes that the process creates a mutex named 'Global\XPSS-1.0.0' and writes a registry key under HKCU\Software\Microsoft\Windows\CurrentVersion\Run. What do these actions MOST likely indicate?
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.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The malware is establishing persistence and ensuring only one instance of itself runs.
The mutex 'Global\XPSS-1.0.0' is used to prevent multiple instances of the malware from running simultaneously, which is a common anti-analysis and stability technique. Writing a registry key under HKCU\Software\Microsoft\Windows\CurrentVersion\Run is a standard method for achieving persistence, ensuring the malware executes automatically at user logon. Together, these actions directly indicate persistence and single-instance control, not privilege escalation, C2 communication, or hiding.
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.
- ✗
The malware is performing privilege escalation by exploiting a known vulnerability.
Why it's wrong here
Mutex and Run registry key are not directly related to privilege escalation.
- ✗
The malware is communicating with a command-and-control server to receive further instructions.
Why it's wrong here
Network communication would be detected separately; mutex and registry do not directly indicate C2.
- ✗
The malware is attempting to hide its presence by using a system mutex name and a legitimate registry location.
Why it's wrong here
While the actions are suspicious, they are not primarily for hiding; they indicate persistence and single-instance control.
- ✓
The malware is establishing persistence and ensuring only one instance of itself runs.
Why this is correct
The Run registry key provides persistence, and the mutex prevents multiple instances.
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.
Common exam traps
Common exam trap: answer the scenario, not the keyword
EC-Council often tests the distinction between persistence mechanisms and hiding techniques, trapping candidates who confuse a standard persistence location (Run key) with a stealth or concealment method, when hiding typically involves alternate data streams, registry run keys under Policies, or rootkit-level hooks.
Detailed technical explanation
How to think about this question
The 'Global\' prefix in a mutex name indicates a kernel object accessible across all sessions in a Windows system, which is often used by malware to ensure only one instance runs system-wide, even across different user sessions. The Run registry key is processed by the Windows Shell (explorer.exe) at user logon, and malware commonly writes here with a value name that mimics legitimate software (e.g., 'Windows Update') to avoid suspicion. In real-world analysis, combining these two artifacts is a strong indicator of a trojan or backdoor that needs to survive reboots and avoid duplicate execution that could alert the user or crash the system.
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.
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.
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FAQ
Questions learners often ask
What does this CHFI question test?
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: The malware is establishing persistence and ensuring only one instance of itself runs. — The mutex 'Global\XPSS-1.0.0' is used to prevent multiple instances of the malware from running simultaneously, which is a common anti-analysis and stability technique. Writing a registry key under HKCU\Software\Microsoft\Windows\CurrentVersion\Run is a standard method for achieving persistence, ensuring the malware executes automatically at user logon. Together, these actions directly indicate persistence and single-instance control, not privilege escalation, C2 communication, or hiding.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Last reviewed: Jun 30, 2026
This CHFI practice question is part of Courseiva's free EC-Council 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 CHFI exam.
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