From: Joe Stewart (jstewartlurhq.com)
Date: Fri Sep 05 2003 - 08:03:41 CDT

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On Thursday 04 September 2003 02:05 pm, Reid Forrest wrote:
> We've had three machines across multiple sites come up
> with the backdoor.coreflood trojan today. NAV caught
> them all, but I'm wondering how it got in. We block
> .exe attachments.
>
> It's my understanding that this thing doesn't
> propagate itself. One instance I can understand, but
> three seemingly unrelated infections are puzzling.
>
> Is anyone else seeing this, or have any ideas?

It sounds like your users visited a site hosted at Interland last week
and were hit by the IE exploit a hacker appended to the pages in an
IFRAME. The description as backdoor.coreflood is misleading; the
trojan you found was probably a proxy server, not an IRC bot. The
proxy server shares a lot of base code with the coreflood IRC bot
and uses the same style of DLL injection, but the functionality is
completely different.

-Joe

--
Joe Stewart, GCIH
Senior Security Researcher
LURHQ Corporation
http://www.lurhq.com/

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