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 suspicious process creating multiple mutexes with names like 'XxX_12345' and 'XxX_67890' and making outbound connections to an IP address 185.130.5.1 on port 443. Which behavioral indicator is MOST consistent with malware communication?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The mutexes indicate an attempt to prevent multiple instances, and outbound connections suggest C2 activity
The creation of mutexes with a consistent naming pattern (e.g., 'XxX_12345') is a classic anti-replication mechanism used by malware to ensure only one instance runs on a system, preventing conflicts and detection. The outbound connections to a specific IP on port 443 (HTTPS) are highly indicative of command-and-control (C2) communication, as malware often uses encrypted channels to blend in with legitimate traffic. Option C correctly identifies both the mutex's purpose (preventing multiple instances) and the network behavior (C2 activity), making it the most consistent with malware communication.
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 process is performing data exfiltration via DNS tunneling
Why it's wrong here
No DNS queries mentioned; the connection is direct IP:443.
✗
The process is attempting to spread to other machines via SMB
Why it's wrong here
No evidence of SMB activity; only outbound connections on 443 are mentioned.
✓
The mutexes indicate an attempt to prevent multiple instances, and outbound connections suggest C2 activity
Why this is correct
Mutexes are often used for single-instance protection, and outbound connections are typical for C2.
Related concept
Read the scenario before looking for a memorised answer.
✗
The process is a legitimate application using mutexes for inter-process communication
Why it's wrong here
IP address 185.130.5.1 is likely suspicious; legitimate apps don't typically create such mutexes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that any outbound connection on port 443 is automatically legitimate HTTPS traffic, but the trap here is that malware frequently uses this port for C2, and the mutex pattern is a key differentiator from benign software.
Detailed technical explanation
How to think about this question
Mutexes in Windows are kernel objects that can be named globally; malware often uses a hardcoded or algorithmically generated mutex name (e.g., based on a victim ID) to ensure single-instance execution and sometimes to mark a system as infected. Outbound HTTPS on port 443 to a specific IP is a common C2 channel because it mimics normal web traffic, making it difficult for firewalls to block without deep packet inspection; tools like Cobalt Strike or Metasploit frequently use this pattern. In real-world scenarios, analysts can detect such behavior by correlating process creation events with network connections using tools like Sysmon or Windows Event Logs (Event ID 3 for network connections).
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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
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: The mutexes indicate an attempt to prevent multiple instances, and outbound connections suggest C2 activity — The creation of mutexes with a consistent naming pattern (e.g., 'XxX_12345') is a classic anti-replication mechanism used by malware to ensure only one instance runs on a system, preventing conflicts and detection. The outbound connections to a specific IP on port 443 (HTTPS) are highly indicative of command-and-control (C2) communication, as malware often uses encrypted channels to blend in with legitimate traffic. Option C correctly identifies both the mutex's purpose (preventing multiple instances) and the network behavior (C2 activity), making it the most consistent with malware communication.
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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