The correct answer is timestomping and packing, as both are classic anti-forensic techniques designed to obstruct static malware analysis. Timestomping manipulates file creation and modification timestamps to mislead investigators about when a file was first introduced or altered, while packing compresses or encrypts the malicious code within a PE file, rendering it unreadable to disassemblers and signature-based scanners until runtime. On the CHFI exam, this tests your understanding of how malware evades initial forensic scrutiny—a core competency for a Computer Hacking Forensic Investigator. A common trap is confusing packing with simple encryption or assuming timestomping only affects file hashes; remember that packing hides the actual code structure, while timestomping hides temporal evidence. For a quick memory tip, think of “Time and Wrap”—timestomping alters the timeline, and packing wraps the code in a deceptive shell.
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 malware analyst is performing static analysis on a suspicious PE file. Which TWO of the following are examples of anti-forensic techniques that the malware might use to hinder analysis? (Select TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Packing or obfuscating the malicious code
Packing or obfuscating the malicious code (Option B) is a classic anti-forensic technique used to hinder static analysis. Packers compress or encrypt the original PE file's code and data, making it unreadable to disassemblers and signature-based scanners until the unpacking stub executes at runtime. This forces the analyst to perform dynamic analysis or manual unpacking, significantly increasing the time and complexity of the investigation.
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.
✗
Using TLS encryption for network communication
Why it's wrong here
TLS is standard encryption for network traffic, not an anti-forensic technique.
✓
Packing or obfuscating the malicious code
Why this is correct
Packing obfuscates the code to evade signature detection and analysis.
Related concept
Read the scenario before looking for a memorised answer.
✗
Creating registry keys for persistence
Why it's wrong here
Persistence is functional, not specifically anti-forensic.
✗
Writing temporary files to the %TEMP% directory
Why it's wrong here
Writing temp files is normal behavior, not specifically anti-forensic.
✓
Timestomping to modify file creation and modification timestamps
Why this is correct
Timestomping is used to hide traces and mislead forensic analysis.
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 anti-forensic techniques (which actively hinder analysis) and common malware behaviors (which are forensic artifacts themselves), so candidates mistakenly select persistence or file-writing options as anti-forensic when they are actually evidence-creating actions.
Detailed technical explanation
How to think about this question
Packing works by replacing the original PE entry point with a small decompressor stub that, at runtime, decompresses the original code into memory and transfers control to it. Tools like UPX, Themida, or VMProtect use varying levels of obfuscation, including encryption, anti-debugging checks, and import address table (IAT) hiding, which can defeat static tools like IDA Pro or Ghidra until the sample is unpacked. Timestomping (Option E) modifies the PE file's NTFS timestamps (e.g., $STANDARD_INFORMATION and $FILE_NAME attributes) using tools like SetMace or Timestomp, which can mislead investigators about when the file was created or last modified, hindering timeline analysis.
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: Packing or obfuscating the malicious code — Packing or obfuscating the malicious code (Option B) is a classic anti-forensic technique used to hinder static analysis. Packers compress or encrypt the original PE file's code and data, making it unreadable to disassemblers and signature-based scanners until the unpacking stub executes at runtime. This forces the analyst to perform dynamic analysis or manual unpacking, significantly increasing the time and complexity of the investigation.
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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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.
Question Discussion
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