Creating a memory image is the correct method for preserving the state of volatile memory because it captures all the data contained in RAM at a particular moment, which could be lost if the system is powered down. This needs to be done before any other action to ensure that potential evidence, which may exist only in memory and could be crucial to understanding the breach, is retained. Encrypting the disk does not address the volatility of memory, changing file permissions could alter metadata and may not be effective for data in memory, and disconnecting from the network, while important, does not by itself preserve memory contents.
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What is volatile memory and why is it important during incident response?
What tools are commonly used for creating memory images?
What are the potential risks of not creating a memory image during an incident response?