[Bro] Extract only certain files types

[James Lay]

This took me way to long to get to sorry..here's what I have for my smtp 
extract...should help:

global ext_map: table[string] of string = {
         ["application/x-dosexec"] = "exe",
         ["application/zip"] = "zip",
         ["application/msword"] = "xls",
         
["application/vnd.openxmlformats-officedocument.wordprocessingml.document"] 
= "docx",
         
["application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"]  = 
"xlsx",
         
["application/vnd.openxmlformats-officedocument.presentationml.presentation"] 
= "pptx"

};

event file_sniff(f: fa_file, meta: fa_metadata)
         {
         if ( f$source != "SMTP" )
                 return;

         if ( ! meta?$mime_type || meta$mime_type !in ext_map )
                 return;

         local ext = "";

         if ( meta?$mime_type )
                 ext = ext_map[meta$mime_type];

         local fname = fmt("%s-%s.%s", f$source, f$id, ext);
         Files::add_analyzer(f, Files::ANALYZER_EXTRACT, 
[$extract_filename=fname]);
}

James

On 2018-02-16 04:47, Fernandez, Mark I wrote:
> Ambros,
> 
>>> What should the extract-all-files.bro look like in order to
>>> only extract pdf, exe, doc and docx?
> 
> The fa_metadata record contains the MIME type.  Using the MIME type,
> you can make a condition on whether or not to extract the file.
> 
> Mark
> 
> 
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