The correct answers are factory reset and timestomping, two of the most common mobile anti-forensic techniques encountered in mobile forensics. A factory reset is a destructive technique that wipes user data partitions and resets the device to its original state, often executed via the 'wipe_data' command in recovery mode, making standard logical acquisition impossible. Timestomping, on the other hand, is a subtle manipulation where attackers modify file timestamps—using commands like 'touch -t' on rooted devices or directly altering EXT4 metadata—to corrupt the forensic timeline and hide the sequence of events. On the Computer Hacking Forensic Investigator CHFI exam, this question tests your ability to distinguish between techniques that destroy data versus those that alter metadata; a common trap is confusing timestomping with simple file deletion. Remember the mnemonic “Reset to Reset, Stamp to Scam” to recall that factory resets reset the device state, while timestomping scams the timeline.
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 forensic examiner is analyzing a mobile device that may have been tampered with to erase evidence. Which TWO anti-forensic techniques are commonly encountered in mobile forensics? (Select TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Factory reset
Factory reset (option C) is a common anti-forensic technique in mobile forensics because it wipes user data partitions and resets the device to its original state, often using the 'wipe_data' command in recovery mode or via settings. This removes user-installed applications, accounts, and files, making data recovery difficult unless a physical or chip-off method is used. Timestomping (option E) is also common, as attackers modify file timestamps (e.g., using 'touch -t' on rooted devices or manipulating EXT4 metadata) to mislead forensic timelines and hide the sequence of events.
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.
✗
Encryption
Why it's wrong here
Encryption is a security measure, not typically considered anti-forensic tampering.
✗
Steganography
Why it's wrong here
Steganography hides data but is not a common tampering technique.
✓
Factory reset
Why this is correct
Factory reset is a common method to erase evidence on mobile devices.
Related concept
Read the scenario before looking for a memorised answer.
✗
Log wiping
Why it's wrong here
Log wiping is possible but less common on mobile devices; more typical on servers.
✓
Timestomping
Why this is correct
Timestomping alters file timestamps to mislead investigators about when events occurred.
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 (active evidence destruction or manipulation) and general security controls (like encryption), leading candidates to incorrectly select encryption as an anti-forensic method.
Detailed technical explanation
How to think about this question
Factory reset on Android devices triggers the 'wipe_data' command in the recovery partition, which reformats the /data partition using ext4 or F2FS, overwriting file system metadata and user data blocks; however, residual data may remain in NAND flash due to wear leveling, allowing partial recovery via JTAG or chip-off. Timestomping on mobile devices often involves modifying the 'crtime' (creation time) or 'mtime' (modification time) in EXT4 inode structures using tools like 'debugfs' or 'stat' commands on rooted devices, which can confuse forensic tools that rely on MAC times for 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 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: Factory reset — Factory reset (option C) is a common anti-forensic technique in mobile forensics because it wipes user data partitions and resets the device to its original state, often using the 'wipe_data' command in recovery mode or via settings. This removes user-installed applications, accounts, and files, making data recovery difficult unless a physical or chip-off method is used. Timestomping (option E) is also common, as attackers modify file timestamps (e.g., using 'touch -t' on rooted devices or manipulating EXT4 metadata) to mislead forensic timelines and hide the sequence of events.
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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