I'm sorry that you're getting frustrated again with me, but maybe I'm not
being clear? I know that AFC doesn't use the file extension to detect the
mime type. My point is that it's not the newer (2007 I think) word with
macro format - docm.
My tests are showing that with exe-bin in Level 1 (which should detect and
reject VBA macros in office files) that docm (m on the end, meaning its a
newer format Word with macro file) slip through ASSP. I had previously
had docm under Level 1 too and found that renamed docm files came through.
After removing docm as a test, I found that you don't even need to rename
them.
It's as if AFC isn't detecting macros in the newer Word formats. If I have
macros in .doc files (Word 2003 and earlier) they ARE detected, encrypted
or not!
I know how much you despise Office products, so I attached a sample docm
file for your reference.
And last, and only semi-related, can we get an option in AFC to also reject
encrypted office documents (even without macros)? I know macros will be
caught even in encrypted word 2003 and older documents, but it seems like
spammers are trying to slip through spam content and phishing attempts
using encrypted Office docs now too... I wish we could just block Office
documents altogether, but that would all but put this charity out of
business.
On Wed, Nov 2, 2016 at 4:48 PM, Thomas Eckardt <thomas.ecka...@thockar.com>
wrote:
> >even if not encrypted seem to slip through.
>
> NO!
>
> I don't want to explain this again and again and again.
>
> ASSP_AFC uses a MIME-type based content detection.
>
> Thomas
>
>
>
>
>
> Von: K Post <nntp.p...@gmail.com>
> An: ASSP development mailing list <assp-test@lists.sourceforge.net>
> Datum: 02.11.2016 17:28
> Betreff: Re: [Assp-test] Blocking encrypted and/or VBA embedded MS
> Office Docs
> ------------------------------
>
>
>
> ASSP_OCR only processes text attachments and PDF - no word documents.
>
> Thomas
>
> Is there a way to scan the content of (unencrypted) office documents for
> bad content? Seems like the spammers are heading this route.
>
> Macros are not enrypted (at least the statements checked by AFC) and will
> be detected.
> If not - provide me a download of such a document.
>
> Attached, please find a Word 2016 document (xml format) that has a macro
> and is encrypted. Word has me save it as a docm file. If I attach as docm
> is it blocked as expected. But if I rename as .doc the message comes
> through assp, macro and all.
>
> Password to decrypt this document is "macro"
>
> The ploy here which I see often now is a message saying that the
> attachment contains important info about a bill, an account, whatever. Then
> it says that the message is encrypted for security and to use password
> ______ to open it. If the user falls for it, there's potential that
> they'll run the vba / macro too....
>
>
> In testing, I also found that renamed docm with macro files, even if not
> encrypted seem to slip through. Is the AFC plugin possibly not detecting
> docm files based on content and only looking at them by extension?
>
> Thanks
> Ken
>
>
>
>
> On Tue, Nov 1, 2016 at 9:37 PM, K Post <*nntp.p...@gmail.com*
> <nntp.p...@gmail.com>> wrote:
> Missed that we already had AFC to block vba macros. That is in fact
> working great.
>
> However, the new tactic is to send *encrypted* word documents and put the
> password in the email. Those aren't caught, which makes sense - AFC can't
> read the file to tell that there's a macro! Can AFC be modified to block
> for encrypted office documents?
>
>
> On Thu, Oct 27, 2016 at 10:19 PM, K Post <*nntp.p...@gmail.com*
> <nntp.p...@gmail.com>> wrote:
> With more and more and more attached files slipping through ClamAV's
> hands, and the majority of these being either encrypted MS Office documents
> or zero day-ish Word documents with VBA embedded, I'm wondering if ASSP_AFC
> could be modified to optionally reject/strip/score messages that are either:
> 1) Encrypted MS Office documents and/or
> 2) MS Office documents that contain VBA code.
>
> Related, detect PDF files with Javascript or Flash embedded??
>
> (and Thomas, if you're replying to this, could you also cc me directly so
> that I get the reply - gmail is rejecting your DKIM messages that pass
> through SourceForge without SRS)
>
> THANKS
>
>
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