The answer is timestomping and packing. Timestomping is an anti-forensic technique that deliberately alters a file’s timestamps—such as creation, modification, or last access times—to mislead investigators about when malware was installed or executed, effectively blending malicious activity into normal system logs. Packing, on the other hand, compresses or encrypts the malware’s executable code, obfuscating its original binary signature and strings to hinder static analysis and evade signature-based detection until runtime unpacking occurs. On the Computer Hacking Forensic Investigator CHFI exam, this question tests your ability to distinguish active evasion methods from passive artifacts; a common trap is confusing encryption (a packing feature) with data wiping or log deletion, which are separate techniques. Remember the mnemonic “Time and Pack” to recall that timestomping manipulates metadata while packing hides the code itself—both are core anti-forensic strategies malware uses to stay invisible during forensic examination.
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.
Which TWO of the following are anti-forensic techniques used by malware to evade detection?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Packing
Packing is an anti-forensic technique that compresses or encrypts the malware's executable code, making static analysis difficult by obfuscating the original binary signature and strings. This allows malware to evade signature-based detection by antivirus and forensic tools until the packed code is unpacked at runtime.
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.
✓
Packing
Why this is correct
Packing compresses/obfuscates code to evade signature-based detection.
Related concept
Read the scenario before looking for a memorised answer.
✗
Logging errors
Why it's wrong here
Logging errors is not an anti-forensic technique.
✓
Timestomping
Why this is correct
Timestomping alters file timestamps to mislead forensic analysis.
Related concept
Read the scenario before looking for a memorised answer.
✗
Encryption of communication
Why it's wrong here
Encryption of communication is an evasion technique but not specifically anti-forensic.
✗
Creating mutexes
Why it's wrong here
Mutex creation is a behavioral indicator, not anti-forensic.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between anti-forensic techniques (which actively hide or destroy forensic evidence) and general security mechanisms (like encryption of communication) that do not directly target forensic artifacts.
Detailed technical explanation
How to think about this question
Packing works by wrapping the original executable with a decompression stub; when executed, the stub decompresses the original code in memory, which can then be analyzed by dynamic analysis tools. Timestomping alters file timestamps (e.g., using the SetFileTime API on Windows) to manipulate MAC times (Modified, Accessed, Created), making it harder for forensic examiners to reconstruct the timeline of an incident. Real-world malware like Emotet often uses both packing and timestomping to evade initial detection and hinder forensic 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 — Packing is an anti-forensic technique that compresses or encrypts the malware's executable code, making static analysis difficult by obfuscating the original binary signature and strings. This allows malware to evade signature-based detection by antivirus and forensic tools until the packed code is unpacked at runtime.
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.
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 →
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Which of the following is an example of an anti-forensics technique used to hide malicious activity?
easy
✓ A.Timestomping
B.Running a sandbox
C.Creating a mutex
D.Generating a hash
Why A: Timestomping is an anti-forensics technique that deliberately modifies file timestamps (e.g., MAC times: Modified, Accessed, Created) using tools like `touch` on Linux or `SetFileTime` on Windows. By altering these timestamps, an attacker can hide the true timeline of malicious file creation, modification, or access, thereby evading forensic timeline analysis and making it appear that malicious activity occurred at a different time or was part of legitimate system operations.
Last reviewed: Jun 24, 2026
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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.
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