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In yesterday's diary entry "A 'Stream O' Maldoc", the payload was an XSL/XSLT file.
Now, malicious XSL files will not execute just by double-clicking them. On a default Windows install, Internet Explorer will be lanched to display the content of the file as XML:
But in this case, the malicious Word document contains VBA code that will launch a WMIC query with the XSL file as stylesheet:
This results in the execution of the code inside the XSL file, as discovered and reported by subTee/Casey Smith last year.
Didier Stevens |
DidierStevens 449 Posts ISC Handler |
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Jul 6th 2019 10 months ago |
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