I have received an email from a not entirely trustworthy source, it might be legit but I'm not really sure. It contains, among other things, information on a .docx Microsoft Word file and a .xlsx Microsoft Excel file.
I have already scanned the files on http://virustotal.com and no viruses have been found, but I also read that macros can exist in the xml or zipped portion of the files themselves.
I am seeking ideas about pinpointing potential malicious intent, such as finding macros.
Answer
Macros cannot be saved in .xlsx files. Excel will refuse, and tell you to save it as an .xlsm file. If you save as .xlsm and then rename as .xlsx Excel will not open the file.
Assuming someone got around this restriction, then Excel will disable any macros found in an .xlsx file.
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