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I've mentioned Excel 4 macros before, a scripting technology that predates VBA. In that diary entry, I handle .xls files (ole files). Excel 4 macros can also be stored in Office Open XML format files: .xlsm files. If we take a look at an .xlsm file with Excel 4 macros with oledump.py, we'll get this output:
There is no ole file (vbaProject.bin) file inside an Excel 4 macro-only file. We need to take a look with zipdump.py:
The presence of folder macrosheets tells us that there are Excel 4 macro sheets inside this file. We can look at the content of the XML file:
And pretty-print it with xmldump.py:
Now it's easier to spot the formulas: EXEC("calc.exe") and HALT() And the Auto_Open can be found in the worksheet XML file:
It's possible to have both macro types inside the same file: Excel 4 and VBA macros. I'll cover that in an upcoming diary entry.
Didier Stevens |
DidierStevens 432 Posts ISC Handler |
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Feb 24th 2020 1 month ago |
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