CHFI Mobile and Malware Forensics Practice Question
This CHFI practice question tests your understanding of mobile and malware forensics. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 analyst needs to acquire evidence from an iPhone 12 running iOS 15. The device is passcode-locked and cannot be unlocked. Which acquisition method should be used to obtain the MOST data possible?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Physical acquisition via GrayKey or Cellebrite
GrayKey and Cellebrite perform physical acquisition by exploiting bootrom or iBoot vulnerabilities (e.g., checkm8 on older devices) or using advanced brute-force techniques to extract the full file system image, including encrypted keychain data and deleted files. This method bypasses the passcode lock and retrieves the maximum amount of data from an iPhone 12 running iOS 15, as logical and manual methods are severely limited by the locked state.
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.
✓
Physical acquisition via GrayKey or Cellebrite
Why this is correct
These tools can perform physical extraction even on locked devices, using advanced exploits.
Related concept
Read the scenario before looking for a memorised answer.
✗
Logical acquisition via iTunes backup
Why it's wrong here
Requires the device to be unlocked or passcode known; not possible if locked.
✗
Manual acquisition by photographing the screen
Why it's wrong here
Cannot bypass lock screen; only visual data if unlocked.
✗
File system acquisition via jailbreak
Why it's wrong here
Jailbreak requires a passcode to be bypassed; not feasible on locked iOS 15.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that a logical backup (Option B) is sufficient for locked devices, but the trap is that iTunes backups require the device to be unlocked and trusted, making them impossible on a passcode-locked iPhone 12 running iOS 15.
Detailed technical explanation
How to think about this question
Physical acquisition tools like GrayKey use a combination of hardware and software to exploit low-level boot processes (e.g., SecureROM or iBoot vulnerabilities) to load a custom ramdisk that dumps the full NAND flash, including the encrypted keychain (which stores Wi-Fi passwords, tokens, and biometric data) and unallocated space. In real-world scenarios, even with iOS 15's enhanced security (e.g., SEP isolation), physical acquisition can recover data from devices that have never been unlocked after a reboot, as long as the tool can bypass the initial lock screen.
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 via GrayKey or Cellebrite — GrayKey and Cellebrite perform physical acquisition by exploiting bootrom or iBoot vulnerabilities (e.g., checkm8 on older devices) or using advanced brute-force techniques to extract the full file system image, including encrypted keychain data and deleted files. This method bypasses the passcode lock and retrieves the maximum amount of data from an iPhone 12 running iOS 15, as logical and manual methods are severely limited by the locked state.
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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