What I've got so far is that the 7654 IRC connection is
typical of the "SDBot" family of malware.
The number of infections has stabilized -- only one new
infected machine in the last three hours. That strongly
suggests that machines with up to date patches and/or
antivirus and/or non-blank passwords are probably immune,
which argues against the 0day hypothesis.
Dave
-----Original Message-----
From: Olivier Meyer [mailto:roguefugu@gmail.com]
Sent: Wednesday, December 13, 2006 2:40 PM
To: gillettdavid@fhda.edu
Subject: Re: RE: Worm attack on our network this morning --
anyone else see this?
Did you identify the backdoor used?
On 12/13/06, David Gillett <gillettdavid@fhda.edu> wrote:
I neglected to mention that the "phone home"
destinations are all
in the 86.x.x.x range.
Dave
-----Original Message-----
From: David Gillett [mailto:gillettdavid@fhda.edu]
Sent: Wednesday, December 13, 2006 1:05 PM
To: 'incidents@securityfocus.com'
Subject: Worm attack on our network this morning --
anyone else see
this?
Late Monday afternoon, I noticed that a machine was scanning
random addresses across both campuses using port 135 (DCE). I
blocked the port and tracked the machine to the support
area, where
one of the techs was reformatting a laptop.
Late Tuesday afternoon, I noticed similar traffic from another
machine, and blocked that port.
This morning, that second machine showed up somewhere else on
campus, and similar traffic was flooding from 22 additional
machines, 19 at the big campus and 3 at the other
-- most appear to also be laptops.
In addition to spreading via port 135, I've also seen:
1. At least one machine eventually started similar
scanning on port
445 (CIFS).
2. These machines all try to "phone home" to port 7654 of
a remote
machine. I've got that blocked now, but one succeeded and
appeared
to be talking IRC over that port, reporting a "successful file
download" to/from an additional machine which (so far) doesn't
appear to have been trying to spread the infection further.
I've got the "phone home" traffic blocked, and the
known infected
machines null-routed at the gateway, which *should* make it just
about impossible for them to infect outside their own VLANs.
The targets are all PCs, and most seem to be laptops. I'm
thinking about this week's MS Office 0days, and maybe
about recent
wireless driver vulnerabilities, but this *could* be
something older
that walked in on a visiting laptop....
David Gillett
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