RE: Probable new MS DCOM RPC worm for Windows (fwd)
From: Tina Bird (tbird_at_precision-guesswork.com)
Date: 09/26/03
- Previous message: Carey, Steve T GARRISON: "RE: Probable new MS DCOM RPC worm for Windows"
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Date: Fri, 26 Sep 2003 14:05:55 -0700 (PDT) To: incidents@securityfocus.com
On Thu, 25 Sep 2003, Carey, Steve T GARRISON wrote:
> We have seen a number of infections of Nachi/Welchia on patched systems. Was
> told that the MS03-026 patch was only 60% effective, so you still had a 1 in 3
> chance of being infected. Apparently the MS03-039 patch fixes the entire
> vulnerability and not just some of it. We re-enforced the rule for keeping the
> anti-virus current, which stopped Nachi/Welchia worm (in most cases, not all).
so, given that welchia installs the patch for 03-026, and given that
windows will happily re-install 03-026 even if it's already there, how did
you figure out that some of those machines were infected >after< they had
03-026 installed?
it's got me perplexed. i'm sure that some of my users thought they
installed it and hadn't for some reason or other, and then got
infected...and i've gotten reports of "i patched it and it still got
hit"...and i can't figure out how to tell the difference.
well, you could look at the event log entries and see if
there was more than one for KB823980, but i've seen reasonably reliable
cases where the registry setting existed but the patch wasn't actually
installed.
whereas checking the file manifests is usually the most reliable way to
tell whether or not the patch was installed, but won't really tell you if
the patch was installed more than once.
thanks -- tina bird
computer security @stanford, with a huge number of welchia-infected
systems -- or at least, there were...
--
At what point does it become easier to maintain a human relationship
than a Windows box?
Robert Cowles
http://www.precision-guesswork.com
Log Analysis http://www.loganalysis.org
VPN http://vpn.shmoo.com
tbird's Security Alerts http://securecomputing.stanford.edu/alert.html
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