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http-equiv_at_excite.com
Date: Thu Jul 25 2002 - 10:36:26 CDT

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    Doug Monroe <monwelinterhack.net> said:

    > "http-equivexcite.com" wrote:
    > >
    > > Tuesday, July 23, 2002
    > > Trivial silent delivery and installation of an executable on a
    target
    > > computer. This can be accomplished with the default installation
    of
    > > the mail client Eudora 5.1.1:
    > > 'allow executables in HTML content' DISABLED
    > > 'use Microsoft viewer' ENABLED
    > [snip]
    > > Working Example:
    > [snip]
    > > http://www.malware.com/boodora.txt
    > >
    > > Notes: disable 'use Microsoft viewer'
    >
    > A Eudora expert I am not, but I suppose one could also change
    > HKCU/software/qualcomm/eudora/launchmanager/path#2
    > from
    > "c:\windows\application data\qualcomm\eudora\embedded"
    > or
    > "c:\program files\qualcomm\eudora pro\embedded"
    > to some other, non-default folder name.
    > New folder must exist before running eudora again.
    >
    > And... add mhtml to "WarnExtentions#X" key values?

    Doug, excellent point.

    1. Yes, if you can relocate the embedded folder. Better.

    2. No. adding warnings to extensions appears to be useless:

    Just tested something here. Typically IE can or will open files
    depending what the contents are regardless of the extension that it
    is: <html> tag in a gif or some other file type should or can be
    rendered by IE for what the contents are, not the extension.

    New Note 25.7.02: trying that with the above demo, creating &
    depositing only malware.exe and malware [no file exetension] yielded
    some very interesting results.

    <META http-equiv=refresh
    content="1; &#13;&#10;url=file://C:\WINDOWS\Application
    Data\Qualcomm\Eudora\Embedded\malware">

    Expecting IE to spring open with the non-extension'd mhtml file fully
    functional, we find that in fact it does not. We find that the
    malware.exe is immediately executed.

    Removing the mhtml file from the embedded folder and leaving only
    malware.exe in there, the meta refresh pointing to 'malware' only [no
    extension at all] appears to execute the *.exe directly -- no need
    for the mhtml file at all.

    Could be an anomaly with this machine, but simply send yourself the
    meta refresh pointing to malware minus extension, place an executable
    with the same name in the embedded folder and see if it executes.

    No time right now to grind it into powder. 

    -- 
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