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Re: RPC errors
From: "Steven M. Bellovin" <smb () research att com>
Date: Tue, 12 Aug 2003 16:52:33 -0400


In message <Pine.LNX.4.33.0308121243210.814-100000 () morannon the-infinite org>, 
"Dominic J. Eidson" writes:

On Mon, 11 Aug 2003, Jack Bates wrote:

Sean Donelan wrote:

http://isc.sans.org/diary.html?date=2003-08-11
The worm uses the RPC DCOM vulnerability to propagate. One it finds a
vulnerable system, it will spawn a shell and use it to download the actual
worm via tftp.

The name of the binary is msblast.exe. It is packed with UPX and will self
extract. The size of the binary is about 11kByte unpacked, and 6kBytes
packed:

Has anyone seen/heard of this virus propagating through email in any way?

We appear to have been infected on a network that is very heavily
firewalled from the outside, and are trying to track down possibly entry
methods the worm might have had...

A large number of networks have unknown and unauthorized back doors.  
If it's a decent-sized network and you haven't audited it, don't assume 
that the firewalling is effective.  (My co-author on "Firewalls and 
Internet Security" book, Bill Cheswick, is CTO of a startup that maps 
intranets for just this reason.)


                --Steve Bellovin, http://www.research.att.com/~smb



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