CHFI Mobile and Malware Forensics Practice Question

An Android phone is seized, and the forensic examiner needs to acquire the device in a forensically sound manner. The phone is running Android 12 and has USB debugging enabled. Which acquisition method provides the most complete data without physically modifying the device?

⚠ Common exam trap

EC-Council often tests the misconception that file system acquisition via Cellebrite UFED is the most complete method, but candidates must remember that physical acquisition captures raw flash memory including deleted data, whereas file system acquisition only retrieves active files.

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

✓

Physical acquisition via ADB with appropriate exploit

Physical acquisition via ADB with an appropriate exploit allows the examiner to obtain a complete bit-for-bit copy of the device's flash memory, including deleted data and unallocated space, without physically modifying the device. Since Android 12 has USB debugging enabled, ADB can be used to push an exploit that bypasses security restrictions to perform a physical dump, which is the most comprehensive method available for this scenario.

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 acquisition via Cellebrite UFED
Why it's wrong here
Cellebrite UFED's file system acquisition extracts only allocated files and file-system metadata via a higher-level protocol, skipping unallocated space, deleted file remnants, and slack space that often harbor critical evidence. A physical acquisition, by contrast, images the entire flash memory at the block level, so while UFED file system extraction is useful for targeted data triage, it cannot provide the comprehensive evidentiary coverage required for a thorough Android forensic examination.
✓
Physical acquisition via ADB with appropriate exploit
Why this is correct
Physical acquisition via ADB leverages a custom recovery or a privilege-escalation exploit to execute a low-level block device read, such as dd if=/dev/block/mmcblk0 of=/image.dd, yielding a complete bit-for-bit replica of the flash storage. This preserves deleted files, unallocated clusters, file system slack, and application remnants that are absent from logical or file-system extractions, making it the most comprehensive and forensically defensible approach for Android devices when feasible.
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Logical acquisition through ADB backup
Why it's wrong here
Logical acquisition through ADB backup relies on the Android Backup API and only retrieves application-specific data and system settings that applications choose to expose, typically excluding low-level system partitions, raw user data, and any deleted content. Many apps declare disallowed backup or store data in protected directories, and the resulting archive is not a full file system image, so it cannot recover evidence from unallocated space or validate the integrity of the entire device, significantly limiting its forensic scope.
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Manual extraction using screen captures
Why it's wrong here
Manual extraction using screen captures is the least forensically sound method because it relies on an examiner visually scrolling through the device's user interface to photographically record what is displayed, which inherently omits hidden, metadata, and deleted data. It lacks cryptographic hashing or standardized acquisition workflows, so the evidence cannot be authenticated as complete or unaltered, and its reliance on human detail makes it unsuitable for any case requiring a reproducible, defensible chain of custody.

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CHFI Mobile and Malware Forensics Practice Question

Why each option matters

Option-by-option breakdown

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