full-disclosure - dobble-clicking msblast.exe

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From: dowlingg at sullcrom.com (Dowling, Gabrielle)
Subject: dobble-clicking msblast.exe

Nick....

There is nothing magical except for the ubiquitous port  it traverses on
and the fact that is seems to managing to crash RPC on servers
regardless of privilege and on patched systems once it gets onto a
network....

If you recall, there was a second RPC vuln described around the time
that MS03-26 came out., and for which MS has not issued a patch  It
seems this worm uses it, that was what all the svchost stuff was about
(i.e., those machines weren't infected, they were rather negatively
affected).

G

-----Original Message-----
From: Nick FitzGerald [mailto:nick@...us-l.demon.co.uk] 
Sent: Tuesday, August 12, 2003 11:20 AM
To: full-disclosure@...ts.netsys.com
Subject: Re: [Full-Disclosure] dobble-clicking msblast.exe

martin f krafft <madduck@...duck.net> wrote:

> Does anyone know what happens if you run msblast.exe on an uninfected 
> system?

It becomes infected and infective.

There is nothing especially magical about the features of the worm 
program -- run it and it starts trying to spread (or to DoS 
windowsupdate.com depending on the date).  Its function is certainly 
not affected by the way it gets onto a machine or whether it is 
launched by the exploit code or not (well, it may depend on some 
elevated privileges such as the those it gets as local system from the 
RPC exploit code running, as it does, as part of a system service).

-- 
Nick FitzGerald
Computer Virus Consulting Ltd.
Ph/FAX: +64 3 3529854

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