Re: PenTesting Email AntiVirus

From: Rainer Duffner (rainer@ultra-secure.de)
Date: Fri May 17 2002 - 01:52:00 PDT

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    Ilici Ramirez writes: 
    
    > Hello, 
    > 
    > What ways do you know to pen-test email antivirus
    > software? 
    
    I'd try to pack various combinations of different file-formats into
    each other (OLE-container).
    E.g., if they have disabled .exe to enter or leave the LAN, try sticking
    it into an Excel or PPT-file.
    It should not work, but that's what you're supposed to find out.
    ;-)
    Of course, with webmail-over-https this is 80% pointless nowadays... 
    
    
    > A cool one that has been published before is to zip a
    > very large file that contains the same character. The
    > result, a very small file attached to an email could
    > deplete resources on the antivirus server. Do you know
    > any AV exploitable with this?
    
    It's called 42.zip and there has been a discussion about this once in a 
    while. Search the archives. 
    
    
    cheers,
    Rainer
    -- 
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    Rainer Duffner                   Munich
    rainer@ultra-secure.de          Germany
    http://www.i-duffner.de        Freising
    ========================================
        When shall we three meet again
      In thunder, lightning, or in rain?
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
    
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