Re: NETBIOS Browsing (Long Reply)

From: Computers911 (Computers911@rogers.com)
Date: 11/20/02 

From: "Computers911" <Computers911@rogers.com>
Date: Wed, 20 Nov 2002 06:10:29 GMT

Wouldn't the easiest thing to do be to disassociate NetBEUI from TCP/IP?

According to www.grc.com , all you need to do is add the NetBEUI protocol.
Ounce the protocol is added, remove all bindings from TCP/IP. Restart the
computer and NetBEUI is no longer connected to TCP/IP. Hence you no longer
have to worry about passwords. Right?

Chris.
"The Other Guy" <nospam@this.addy> wrote in message
news:949ltucjgmp92hu7hh9tu5osk295c3kov7@4ax.com...
> On Tue, 19 Nov 2002 21:39:12 +0100, while waiting for Somebody Else to
> show up and say something, The Other Guy responded to a post from
> "Jostein" <jostein@fake.no> who wrote in comp.security.firewalls:
>
> >I'm using PC-illin 2002 antivirus and are using the built in firewall.
I'm
> >getting a lot of attacks referred to as NETBIOS Browsing" on port 137.
> >Can anybody please explain me what a NETBIOS Browsing attack is?
> >Jostein
> >
>
> There have been new viri/worms that have been floating around for a
> couple of months now.
>
> See http://isc.incidents.org/ for Port 137 scans, in particular
> http://isc.incidents.org/analysis.html?id=170
>
>
> There was a vulnerability on that port (a NETBIOS DOS attack) that
> surfaced a couple of months, and speculation is that it might be the
> same thing, or even a new exploit on that same port.
> See
>
http://www.microsoft.com/technet/treeview/?url=/technet/security/bulletin/MS
02-045.asp
>
> Possibly attributed to the recent Bugbear worm also.
> Bugbear
> (note: Bugbear also sets up a listening web server on TCP 36794)
> http://vil.nai.com/vil/content/v_99728.htm
> http://www.sophos.com/virusinfo/analyses/w32bugbeara.html
>
> Scrup
> http://vil.nai.com/vil/content/v_99729.htm
> http://www.sophos.com/virusinfo/analyses/w32opaserva.html
>
>
> Also attributed to the Opasoft worm
>
http://www.trendmicro.com/vinfo/virusencyclo/default5.asp?VName=BKDR_OPASOFT
.A&VSect=T
> https://grc.com/x/news.exe?cmd=article&group=grc.security&item=59379&utag
>
>
http://securityresponse.symantec.com/avcenter/venc/data/w32.opaserv.worm.htm
l
>
http://securityresponse.symantec.com/avcenter/venc/data/w32.opaserv.worm.htm
l
>
http://www.ntbugtraq.com/default.asp?pid=36&sid=1&A2=ind0210&L=ntbugtraq&F=P
&S=&P=72
>
http://www.ntbugtraq.com/default.asp?pid=36&sid=1&A2=ind0210&L=ntbugtraq&F=P
&S=&P=72
>
> See also
> http://www.theregister.co.uk/content/56/27465.html
> http://www.members.optushome.com.au/forsythm/more_UDP_137_stuff.html
>
>
> From www.itworld.com
>
> <start>
>
> New worm, Opasoft, targets Windows systems
> By Paul Roberts
>
> A new worm that targets machines running Microsoft Corp.'s Windows 95,
> 98, and ME operating systems is spreading, according to virus alerts
> posted by several leading antivirus software makers. Named "Opasoft",
> "W32/Opasoft" or "Opaserv," the new virus takes advantage of a common
> Windows application program interface (API) and loose security
> practices to spread over local and wide-area networks.
>
> Unlike other worms that spread from computer to computer over the
> Internet by way of infected e-mail messages, Opasoft takes advantage
> of the Network Basic Input/Output System (NETBIOS), an API containing
> functions used to send and receive data over Microsoft networks,
> according to the announcements.
>
> Once it hits a machine, Opasoft scans the infected computer's network
> for other machines to attack. When a vulnerable machine is located,
> the worm checks to see if the C: drive of that machine has been shared
> with other network computers and can be accessed, according to the
> alerts.
>
> If it can access the C: drive, Opasoft places a copy of itself on that
> machine, then alters the win.ini file so that the worm is run the next
> time the machine is restarted.
>
> If the shared directory on the computer is password-protected, the
> Opasoft worm will attempt to enter that folder by trying
> single-character passwords.
>
> Office and home computer networks that are using any of the affected
> Windows operating systems, and that have enabled file sharing between
> machines on the network are particularly vulnerable to infection by
> Opasoft. This is especially true if passwords have not been
> established to protect access to shared directories on the network,
> according to a statement by security company Kaspersky Labs Ltd.
>
> Although it is not known whether or not the Opasoft worm damages any
> files on the machines it infects, the worm does open a back door from
> the machine to a Web site, www.opasoft.com, from which updated
> versions of the worm and other script files are downloaded.
>
> The Opasoft Web page was not accessible as of Friday afternoon.
>
> For computers infected with the worm, users are instructed to delete
> the worm and make necessary modifications to the win.ini file.
>
> All users are asked to install "strong" passwords for any shared
> folders on their computer -- combinations of three or more letters,
> numbers, and special characters.
>
> </end>
>
> HTH
> T.O.G.
>
> --
> ./configure --prefix=~/zyterion
> Not this guy or that guy, The Other Guy.
>
> This spot may contain a satirical comment or comedic source,
> and is meant to be funny. If you are easily offended, gullible
> or don't have a sense of humour we suggest you read elsewhere.

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