I was asked a question about the protection of an .xlsm spreadsheet. I’ve written before on the protection of .xls spreadsheets, for example in diary entries “Unprotecting Malicious Documents For Inspection” and “16-bit Hash Collisions in .xls Spreadsheets”; and blog post “Quickpost: oledump.py plugin_biff.py: Remove Sheet Protection From Spreadsheets”.
Article Link: Protected OOXML Spreadsheets - SANS Internet Storm Center
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