RE: Possible Intrusion Attempt?

["Jerry Shenk" <jshenk () decommunications com>]

I'd look at the message and see if there is an html file link -
<file://123.132.123.133/someshare/somefile.ext>.  That would cause the
user's e-mail client to attempt to authenticate to that external IP address
and initially send the username/password hash.  If the attacker is
collecting those packets, they could be replayed into L0phtcrack or
something similar and the passwords could be cracked.

Another option would be to sniff the traffic from one of the affected hosts
and see if the workstation tries to connect to some external Ip address when
the message is viewed.  I wouldn't worry too much about information leakage
at this point 'cuz they've already sent the info out.  Just don't log in as
yourself or admin to do it....stick to the user who's already viewed the
message and presumably sent their credentials.

BTW, the solution for this is to block NetBIOS ports and the edge (and
everywhere else;).

-----Original Message-----
From: Matt LaFelero [mailto:ramstryke () yahoo com]
Sent: Wednesday, May 21, 2003 7:48 PM
To: incidents () securityfocus com
Subject: Possible Intrusion Attempt?




I'm hoping someone here might be able to shed some light on this
situation..    Some of my users have been getting some interesting spam
mail.  This is  the first time I've ever seen a spam mail do this.  When the
user opens  the spam mail, all of a sudden, an Internet Explorer
authentication  boxes pops up.  You know those that ask for username,
password, and  domain.    Well, I run MS Proxy 2.0 here and the logon with a
2KPro machine is  integrated so the user never sees this box or has to enter
his/her  password to get on the Web.    It's strange that this email
triggers the authentication box.  What's  even weirder is that it populates
the username for them, with weird  names.  The names always seem to change
from spam mail to spam mail.  I've  seen iterations like fluff, skank,
morton, taxiway.. you name it.  It seems most of the emails are HTML, which
can explain a lot.  None of  them had attachments.  From what I could gather
it seems to attempting to  load a site.  We run Outlook 2000 with SP3 and
all hotfixes.  My question is, how is this happening and is it a threat?
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