Actual warning notification received.

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Hoax Alert : SULFNBK.EXE

As well as portraying all the standard hoax
features, (warns of a dire ‘danger’ then suggests
that the receiver should send it onto all of
their friends to minimize the damage that the
‘virus’ may cause) this E-mail hoax advises the
user to delete the file SULFNBK.EXE which it
states is a virus. For greater impact and added
realism, this hoax mentions that the information contained within has been garnered from a competitor’s anti-virus site.
Two things should be noted about the
file SULFNBK.EXE.

First, it is a standard utility program
included with some versions of Windows and
normally installed in the ‘Command’ subdirectory
of the Windows installation directory. It has
a somewhat odd icon that often leads users to
be suspicious of it, and this is not helped
by the fact that the EXE file does not have
an extended ‘properties sheet’ if right-clicked
in Explorer and its ‘Properties’ viewed.

Second, because of its location size and
being a PE-style EXE, SULFNBK.EXE is commonly
included as an attachment in email messages
sent by the Win32.Magistr virus. Thus, if you
receive a copy of SULFNBK.EXE as an email
attachment, that could well be an infected
copy of the file and an indication that the
sender is infected with Win32.Magitsr.