Preliminary testing reveals that emails containing WMF files can be blocked by filtering for the MIME-encoded WMF header. This approach works even if the file is called WORD.DOC. The string to check for is:
183GmgAA These 8 bytes appear as the first 8 bytes of a MIME-encoded WMF. Thus, blocking all emails with those bytes in will block all emails containing WMFs. This technique can be used with common spam filters. Regarding web-based WMFs, of the three browsers on this system, only IE knows what to do with WMFs. Fortunately, I don't use IE. This is, however, one more reason I can use to convince my customers to dump it. Stu --- Stuart Udall stuart [EMAIL PROTECTED] net - http://www.cyberdelix.net/ --- * Origin: lsi: revolution through evolution (192:168/0.2) _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
