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The email package and KLEZ mails

Oleg Broytmann phd at phd.pp.ru
Tue May 28 05:15:05 EDT 2002 
On Tue, May 28, 2002 at 11:08:26AM +0200, Gerhard HДring wrote:
> * Oleg Broytmann <phd at phd.pp.ru> [2002-05-28 12:31 +0400]:
> > On Tue, May 28, 2002 at 08:21:56AM +0000, Gerson Kurz wrote:
> > > I'm using the email module (new in Python 2.2) to analyze messages for
> > > spam and HTML content. However, I get exceptions when analyzing KLEZ
> > > generated mails, which is disappointing since I'm trying to filter
> > > them in the first place. 
> > 
> > Klez is a carefully created virus. It sends mail that specifically
> > targets Outofluck holes. Those mail messages are constracted in violation
> > of RFCs, so you really cannot parse them with RFC-compliant tools :)
> 
> Which is good, because it's a certain sign that you can just throw the
> message away because all the interesting email you'll get will be RFC
> compliant >:-)

   At least they should, though it is not always true. RFC 2047 is violated
very often :(

> You could send an auto-reply in case somebody's MUA or mail system was
> fscked up.

   You cannot. Klez is *really* very clever virus. It inserts bogus
Reply-To/Return-path headers and envelope headers :(

Oleg.
-- 
     Oleg Broytmann            http://phd.pp.ru/            phd at phd.pp.ru
           Programmers don't die, they just GOSUB without RETURN.
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