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.
An analyst is performing dynamic analysis of a malware sample in Cuckoo Sandbox. Which TWO of the following are typical indicators of command and control (C2) communication?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The malware performs DNS queries to a domain that resolves to a known malicious IP
In dynamic analysis with Cuckoo Sandbox, DNS queries to a domain that resolves to a known malicious IP are a classic indicator of C2 communication because the malware must resolve its command server's address before establishing a channel. Similarly, HTTP POST requests to a very recently registered domain (e.g., 2 days old) are suspicious, as attackers often use fresh domains to evade reputation-based blocklists, and POST is commonly used to exfiltrate data or receive commands.
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 creates a registry run key for persistence
Why it's wrong here
Persistence is different from C2; it ensures survival after reboot.
✓
The malware performs DNS queries to a domain that resolves to a known malicious IP
Why this is correct
DNS queries to malicious IPs are typical C2 beaconing activity.
Related concept
Read the scenario before looking for a memorised answer.
✗
The malware modifies system files in C:\Windows\System32
Why it's wrong here
File modification could be for persistence or payload, but not specifically C2.
✗
The malware creates a mutex named 'Global\MyMutex'
Why it's wrong here
Mutex creation is often used to ensure single instance, not C2.
✓
The malware makes HTTP POST requests to a domain registered 2 days ago
Why this is correct
Recent domain registration combined with HTTP POST is a classic C2 indicator.
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 local host artifacts (persistence, mutexes, file modifications) and network-based C2 indicators, tricking candidates into selecting any suspicious behavior rather than focusing specifically on outbound communication patterns.
Detailed technical explanation
How to think about this question
C2 communication often relies on DNS as a first step, where the malware performs a query for a domain that may use fast-flux or domain-generation algorithms (DGAs) to evade static analysis. HTTP POST requests are favored because they can encapsulate encrypted payloads in the request body, mimicking legitimate web traffic, and the use of a domain registered only 2 days ago exploits the 'zero-day' window before threat intelligence feeds update. Under the hood, Cuckoo Sandbox monitors these network calls via API hooking (e.g., WSASend, sendto) and PCAP analysis, flagging anomalies like low TTL values or unusual HTTP headers.
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: The malware performs DNS queries to a domain that resolves to a known malicious IP — In dynamic analysis with Cuckoo Sandbox, DNS queries to a domain that resolves to a known malicious IP are a classic indicator of C2 communication because the malware must resolve its command server's address before establishing a channel. Similarly, HTTP POST requests to a very recently registered domain (e.g., 2 days old) are suspicious, as attackers often use fresh domains to evade reputation-based blocklists, and POST is commonly used to exfiltrate data or receive commands.
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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