Guide to converting a VirtualBox Virtual Disk Image (.vdi) into a raw forensic image format
The step-by-step guide to converting a VirtualBox Virtual Disk Image (.vdi) into a raw forensic image format (.img/.dd) and verifying data integrity using MD5 and SHA256 hashing algorithms, based on your forensic lab artifacts.
Step 1: Navigate to the VirtualBox Directory
VirtualBox includes a powerful command-line utility called VBoxManage.exe. To use it, open your Command Prompt (cmd) as an Administrator and change the directory (cd) to the default VirtualBox installation path:
cd "C:\Program Files\Oracle\VirtualBox"
Step 2: Calculate Source File Hashes (Pre-Conversion)
Following digital forensic best practices, you must baseline the integrity of the original evidence file (FT4A.vdi) before performing any processing. Use the built-in Windows certutil tool to generate the baseline hashes:
Verify md5 Hash:
certutil -hashfile "G:\Virtual Machine\FT4A\FT4A.vdi" md5
Result: 3f 1a 68 7c da 78 fa cc f7 ae ca 01 c3 56 8e 5a
Verify SHA256 Hash:
certutil -hashfile "G:\Virtual Machine\FT4A\FT4A.vdi" sha256
Result: f5 70 a4 14 11 71 5b 44 ef 0b f7 63 16 91 0d 9c 12 6a 3c 5c 7f a2 47 c3 5c e3 37 27 fe 56 7a 3f
Step 3: Convert the .VDI File to Raw .IMG Format
Execute the clonehd or convertfromraw block manipulation command structure natively via VBoxManage. Pass your target virtual drive container path as the input source and point your final destination path to the uncompressed raw output sector target (--format raw):
VBoxManage convertfromraw "G:\Virtual Machine\FT4A\FT4A.vdi" "G:\Image from VDI.img" --format raw
Step 4: Verify Post-Conversion Evidence Integrity (Hash Matching)
To ensure that no data corruption, alteration, or bit-flipping occurred during the format migration process, calculate the cryptographic signature values of the newly generated raw output file (Image from VDI.img):
Verify MD5 Hash:
certutil -hashfile "G:\Image from VDI.img" md5
Result: 3f 1a 68 7c da 78 fa cc f7 ae ca 01 c3 56 8e 5a (Match)
Verify SHA256 Hash:
certutil -hashfile "G:\Image from VDI.img" sha256
Result: f5 70 a4 14 11 71 5b 44 ef 0b f7 63 16 91 0d 9c 12 6a 3c 5c 7f a2 47 c3 5c e3 37 27 fe 56 7a 3f (Match)
Conclusion: Because the checks for both MD5 and SHA256 line up perfectly with a 100% true identical correlation, data integrity has been verified.
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