CHFI Mobile and Malware Forensics Practice Question
During a mobile forensic investigation, an analyst uses Cellebrite UFED to extract data from a locked iOS device. The extraction successfully retrieves the device's passcode, call logs, SMS messages, and application data. Which extraction method did the analyst MOST likely use?
⚠ Common exam trap
The CHFI exam often tests the misconception that 'physical extraction' is the most powerful method for locked iOS devices, but the trap here is that physical extraction is rarely achievable on modern iOS due to hardware encryption, whereas Advanced Logical Extraction is the practical method used by tools like Cellebrite UFED to retrieve passcodes and application data from locked devices.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Advanced logical extraction
C is correct because Advanced Logical Extraction (ALE) on Cellebrite UFED leverages a combination of file system parsing, agent-based extraction, and exploit techniques to retrieve the device passcode, call logs, SMS messages, and application data from a locked iOS device without requiring a full physical dump. This method bypasses the logical extraction limitations by using a custom agent or AFC (Apple File Conduit) to access protected data, making it the most likely method for the described successful extraction.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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File system extraction
Why it's wrong here
File system extraction creates a logical image of the file system, including allocated and deleted files, but does not copy unallocated space or the entire flash chip. On locked iOS devices, this method typically demands a jailbreak or bootloader-level exploit to bypass the user data partition's encryption, yet it still does not specifically target the keychain where the passcode is stored. Because the passcode is protected by the Secure Enclave and requires keychain-level access, file system extraction falls short of the advanced logical technique that can deliberately retrieve that material.
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Physical extraction
Why it's wrong here
Physical extraction performs a bit-for-bit dump of the full flash memory, which can recover deleted data through carving, but on modern iOS devices it is rarely feasible due to hardware encryption, Secure Enclave protection, and the need for invasive chip-off procedures. Even with a raw image, decrypting the flash contents requires obtaining the file system key from the device itself, which a locked iPhone will not release. Since the scenario involves retrieving a passcode and app data from a locked device, the advanced logical method's exploit-driven keychain extraction is more appropriate and practical than physical acquisition.
- ✓
Advanced logical extraction
Why this is correct
Advanced logical extraction, as performed by tools such as Cellebrite UFED, leverages bootload-level exploits like Checkm8 to temporarily bypass the lock screen and prompt the device to trust the forensic workstation. This grants access to keychain items, including passcode hashes, and permits extraction of app data by reading the encrypted filesystem with the user's decryption keys while the device is powered. It is the correct answer because it is specifically designed to recover passcode-related and application data from locked iOS devices in a non-invasive manner, preserving data integrity without needing a full chip image.
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Logical extraction
Why it's wrong here
Basic logical extraction relies on the device's native operating system APIs and standard synchronization protocols, retrieving only the data that the OS exposes to a trusted host, such as contacts, messages, and calendars. It does not contain any exploit or firmware-level access, so it cannot bypass a locked screen or decrypt the keychain, making the passcode entirely unreachable. Consequently, this method is only effective on devices that are already unlocked or have been previously trusted to the computer, making it unsuitable for a locked iPhone where passcode recovery is required.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.