CHFI Network and Cloud Forensics Practice Question
In a cloud forensic investigation, the analyst needs to obtain a memory dump of a virtual machine. Which method is considered forensically sound?
⚠ Common exam trap
The CHFI exam often tests the misconception that a virtual disk file (.vmdk) contains memory data, when in fact it only stores persistent storage, and that live tools inside the VM are acceptable despite violating forensic soundness by altering the evidence.
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
✓
Take a snapshot of the VM via the hypervisor and export the .vmem file
Forensically sound because taking a snapshot of the VM via the hypervisor and exporting the .vmem file captures the entire volatile memory state from outside the guest OS, without altering any data inside the VM. This method preserves the memory in its pristine state and avoids the contamination that occurs when executing tools inside the suspect VM.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Log into the VM and use a tool to create a crash dump
Why it's wrong here
Logging directly into the VM and triggering a crash dump invokes the guest OS's bugcheck (e.g., NMI or KeBugCheck) pathway, which forces a system restart or enters a special crash state and writes a large hibernation/crash file to disk. This procedure intentionally halts processes, flushes caches, and appends kernel data to storage, thereby altering volatile memory state in ways that destroy the original evidence context — making it an invasive and inherently non-forensically-sound acquisition method.
- ✗
Copy the virtual disk file (.vmdk) and extract memory from it
Why it's wrong here
The .vmdk virtual disk file contains only the non-volatile storage contents (filesystem, sectors, and deleted blocks) that persist when the VM is powered off; it does not contain a representation of the VM's RAM address space. Since memory is volatile and separate from the virtual disk, copying the .vmdk yields only disk artifacts, and attempting to extract memory from it would be impossible because RAM contents are never written there — any pagefile or hibernation remnants would be stale and incomplete evidence, not a true memory capture.
- ✗
Use a live forensic tool inside the VM to capture memory
Why it's wrong here
Installing and running a live memory-capture tool inside the guest OS alters the very memory you are trying to preserve, as the tool's executable, loaded libraries, and process allocations occupy pageframes and modify kernel structures. Furthermore, the hypervisor provides no guarantee that a compromised or untrusted guest kernel hasn't subverted the tool's data, so the resulting capture lacks forensic integrity and does not reflect the pristine state of RAM before the tool executed.
- ✓
Take a snapshot of the VM via the hypervisor and export the .vmem file
Why this is correct
Taking a snapshot of the VM at the hypervisor level and exporting the .vmem file is the proper cloud-forensic technique because the hypervisor, operating below the guest OS, accesses the VM's volatile memory directly without injecting any code into the guest. This point-in-time snapshot suspends or copies the RAM state transparently, preserving the exact contents of memory in a forensically sound format, and the .vmem file represents the guest's full physical address space — including kernel, processes, and any in-memory encryption keys or malware.
Go deeper
Related to this question
Learn chapter
Cloud Forensics: Challenges and Techniques
Key term
Memory Acquisition
Memory acquisition is the process of capturing the contents of a computer's volatile memory to preserve data for forensic analysis and incident response.
Key term
RAM Analysis
RAM Analysis is the forensic examination of a computer’s volatile memory to uncover evidence of running processes, network connections, malware, and user activity that is lost when the system is powered off.
About these practice questions
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JA
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.