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.
During a mobile device investigation, an examiner needs to acquire the maximum amount of data from a locked iOS device without modifying it. Which acquisition type should be used?
Why wrong: Manual acquisition requires user interaction and is not possible on a locked device.
B
Physical acquisition
Physical acquisition provides a complete bit-for-bit copy, including deleted data, and can often bypass lock screens with tools like GrayKey or Cellebrite UFED.
C
Logical acquisition
Why wrong: Logical acquisition only retrieves allocated data and may not access all areas of locked devices.
D
File system acquisition
Why wrong: File system acquisition retrieves the file system structure but may be limited on locked devices.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Physical acquisition
Physical acquisition is the correct choice because it creates a bit-for-bit copy of the entire flash storage, including the operating system, user data, and deleted file remnants, without relying on the iOS operating system to be unlocked or cooperative. This method bypasses the lock screen by exploiting hardware or software vulnerabilities (e.g., checkm8 bootrom exploit) or using advanced forensic tools (e.g., Cellebrite, GrayKey) to read the raw NAND memory, ensuring maximum data extraction while maintaining forensic integrity.
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.
✗
Manual acquisition
Why it's wrong here
Manual acquisition requires user interaction and is not possible on a locked device.
✓
Physical acquisition
Why this is correct
Physical acquisition provides a complete bit-for-bit copy, including deleted data, and can often bypass lock screens with tools like GrayKey or Cellebrite UFED.
Related concept
Read the scenario before looking for a memorised answer.
✗
Logical acquisition
Why it's wrong here
Logical acquisition only retrieves allocated data and may not access all areas of locked devices.
✗
File system acquisition
Why it's wrong here
File system acquisition retrieves the file system structure but may be limited on locked devices.
Common exam traps
Common exam trap: answer the scenario, not the keyword
EC-Council often tests the misconception that logical acquisition is sufficient for locked devices because it can extract backups, but the trap is that logical acquisition still requires the device to be unlocked or have a trusted relationship established, whereas physical acquisition is the only method that can bypass the lock screen to capture the entire storage image.
Detailed technical explanation
How to think about this question
Physical acquisition on iOS often leverages the Device Firmware Upgrade (DFU) mode or a bootrom exploit (e.g., checkm8 for A5–A11 chips) to load a custom ramdisk that dumps the raw NAND blocks, including the encrypted keybag and system keychain. In practice, even with a locked device, tools like Cellebrite UFED can use advanced techniques (e.g., 'advanced logical' or 'checkm8 extraction') to read the storage controller’s memory directly, though full physical acquisition may be limited on newer iOS devices with Secure Enclave and hardware encryption keys that are not recoverable without the user passcode.
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: Physical acquisition — Physical acquisition is the correct choice because it creates a bit-for-bit copy of the entire flash storage, including the operating system, user data, and deleted file remnants, without relying on the iOS operating system to be unlocked or cooperative. This method bypasses the lock screen by exploiting hardware or software vulnerabilities (e.g., checkm8 bootrom exploit) or using advanced forensic tools (e.g., Cellebrite, GrayKey) to read the raw NAND memory, ensuring maximum data extraction while maintaining forensic integrity.
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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