CHFI (312-49) Digital Forensics Simulation
Investigation Scenario
You are part of an incident response team at an Austin, Texas tech firm. The SOC has escalated an alert regarding anomalous network behavior from a financial controller's workstation. The system is currently powered on and connected to the network.
Suspicious PowerShell processes are executing in memory, but initial automated endpoint scans show no malicious binaries written to the physical disk, indicating a potential fileless malware infection. To preserve evidence, you must perform a live acquisition of the volatile memory before isolating the machine.
Evidence Collected
Preliminary triage shows the following system state prior to acquisition:
Question
In a digital-forensics investigation in Austin, Texas, an analyst is performing a live acquisition of a system's memory (RAM). Which of the following tools is commonly used for this purpose?
Expert Analysis
1. What the Evidence Shows
The presence of an active network connection and memory-resident malicious PowerShell execution strongly indicates fileless malware. Because the malware resides in RAM, shutting down the system ("pulling the plug") will permanently destroy the evidence.
2. Forensic Stage
Collection Phase (Live Acquisition). The investigator is at the critical juncture of capturing volatile data according to the Order of Volatility before proceeding to traditional disk imaging.
3. Why the Correct Answer is Correct
A. FTK Imager is an industry-standard, free tool heavily used by forensic investigators to capture physical memory (RAM) and create forensic disk images. It can be run from a sanitized external USB drive (using the "Lite" or command-line versions) to dump the system's memory to a `.mem` file while calculating MD5/SHA hashes, satisfying chain of custody requirements.
4. Why Others are Wrong
B. Autopsy: This is an open-source digital forensics platform used for analyzing disk images and file systems, not for conducting live acquisitions of RAM.
C. EnCase: While EnCase Enterprise has capabilities for remote memory capture, standard EnCase is primarily a heavyweight forensic analysis suite. FTK Imager is the distinct, standard tool recognized for standalone live RAM acquisition in this specific exam context.
D. Wireshark: This is a network protocol analyzer used to capture and inspect network packets (PCAP data), not volatile system memory.
5. Real-World Forensic Action
An investigator would connect a sterile, forensically wiped USB drive containing the portable version of FTK Imager to the target machine. They would run the tool as Administrator, select "Capture Memory," and save the memory dump and pagefile directly to the external USB drive, ensuring the host machine's physical disk remains as unaltered as possible.
MINI LESSON: The Order of Volatility
- Concept: Described in RFC 3227, the Order of Volatility dictates that evidence should be collected from the most volatile to the least volatile.
- Sequence: Registers/Cache → Routing Tables/ARP Cache/Process Table/Kernel Stats → Main Memory (RAM) → Temporary File Systems → Disk → Remote Logging → Physical Configuration.
- Forensic Footprint: Any action taken on a live system alters its state. Running an acquisition tool loads it into RAM and may overwrite deleted data or malware fragments. Always use portable tools from external drives to minimize this footprint.
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