Digital forensics increasingly relies on volatile data captured from Random Access Memory (RAM). However, the massive volume of memory in modern systems (e.g., 64GB+) presents significant storage and transport challenges. This paper examines —a hypothetical or niche implementation of FMC (Forensic Memory Capture) using BL (Block-Level) compression within a .7z (7-Zip) container. We evaluate its effectiveness in preserving forensic integrity while achieving superior compression ratios using LZMA2 and PPMd algorithms. 1. Introduction
Utilizing low-footprint drivers to extract physical RAM.
Traditional memory imaging tools like Magnet RAM Capture or FTK Imager often output raw binary files (.RAW, .DMP). The format aims to standardize the encapsulation of these captures into the 7z open architecture, which supports AES-256 encryption and solid compression to minimize data redundancy. 2. Technical Framework The proposed FMCBL.7z workflow involves three core stages: FMCBL.7z
The format supports header compression and hashing, ensuring that the original state of the capture can be verified against the compressed archive.
Memory dumps often contain significant "zero-fill" or repetitive patterns. 7z's solid compression allows these patterns to be compressed as a single stream, often reducing file size by over 80%. Traditional memory imaging tools like Magnet RAM Capture
Dividing the memory dump into manageable segments to allow for parallel processing and selective extraction.
Drawing from the technical specifications of 7z archive formats and digital forensic methodologies , 7z: Evaluating High-Efficiency Compression for Forensic Memory Capture and Analysis." FMCBL.7z
By using a plugin like Forensic7z , investigators can browse the contents of the image directly within the archiver without full decompression. 4. Comparative Analysis Raw (.BIN/.RAW) Storage Cost Low Encryption Requires 3rd party Native (AES-256) Integrity Checks Manual (MD5/SHA) Built-in CRC/Hash Access Speed Requires mounting/extraction 5. Conclusion