full-disclosure - RE: Probable new MS DCOM RPC worm for Windows

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From: pauls at utdallas.edu (Schmehl, Paul L)
Subject: RE: Probable new MS DCOM RPC worm for Windows

> -----Original Message-----
> From: Richard Johnson [mailto:rnews@...rlpool.river.com] 
> Sent: Wednesday, September 24, 2003 10:03 AM
> To: full-disclosure@...ts.netsys.com; incidents@...urityfocus.com
> Subject: Re: Probable new MS DCOM RPC worm for Windows 
> 
> We finally had infections occur on Tuesday evening showing the same 
> scan behavior.  Sysadmins doing cleanup report Norton and McAfee IDed 
> the bug as W32.Welchia.
> 
> I don't know whether it was a variant using one of the two new RPC 
> holes, or just month-old Welchia. That's because the hosts hit were 
> traditional non-compliant lab machines and non-adminned remote office 
> or home hosts.  In other words, they were still vulnerable to the 
> original blaster worm.

I'm thinking that there *has* to be a variant of Nachi/Welchia in the
wild.  We have machines that were patched for MS03-026 (verified by
scanning with multiple scanners) but not patched for MS03-039 (ditto)
and they have been infected by something that triggers my Nachi rule in
snort.  This should *not* be possible with the "original" Nachi/Welchia,
so my assumption is that either something new has been released or the
worm has mutated somehow.

Mind you, this is anecdotal and a very small incidence (only three
machines so far), but it still bears watching IMHO.  I've been surprised
to not see any discussion on the lists about a new variant.  Perhaps no
one is looking?

Paul Schmehl (pauls@...allas.edu)
Adjunct Information Security Officer
The University of Texas at Dallas
AVIEN Founding Member
http://www.utdallas.edu/~pauls/