Re: MISC IP Reserved bit set

["Matthew Collins" <Matthew.Collins () northernregistrars co uk>]

All the snort rule is doing is looking for the content

window.open("readme.eml"

coming from a web server. As the rule matches itself, downloading the rule from a web server will trigger the rule. 
Note, only the first rule will match, the second will not, as it checks URI content, not just any content.

> > > "Frontgate Lab" <mdiwan () wagweb com> 12/10/01 16:45:23 >>>
Yes i did download rules from snort.org  BUT.. why would that trigger
the readme.eml content alert?

[root@fglab snort]# cat web-misc.rules | grep readme.eml
alert tcp $EXTERNAL_NET 80 -> $HOME_NET any (msg:"WEB-MISC readme.eml
autoload attempt"; flags:A+; content:"window.open(\"readme.eml\"";
nocase; classtype:attempted-user; sid:1290; rev:3;
reference:url,www.cert.org/advisories/CA-2001-26.html;)
alert tcp $EXTERNAL_NET 80 -> $HOME_NET any (msg:"WEB-MISC readme.eml
attempt"; flags:A+; uricontent:"readme.eml"; nocase;
classtype:attempted-user; sid:1284; rev:3;
reference:url,www.cert.org/advisories/CA-2001-26.html;)

Madhav



Matthew Collins wrote:
> Look at the source port. 80 -> YourIP:35434.
>
> Been downloading some rules from the snort web site?
>
> > > > "Frontgate Lab" <mdiwan () wagweb com> 12/10/01 16:02:13 >>>
> Hiya .. errm.. i think this is bad... i belive it is nimda:
>
> Oct 11 11:48:35 fglab snort[4483]: [1:1284:3] WEB-MISC readme.eml
> attempt [Classification: Attempted User Privilege Gain] [Priority: 8]:
> {TCP} 151.196.107.166:80 -> 192.168.150.203:35434
>
> nslookup results:
>
>  nslookup 151.196.107.166
> Note:  nslookup is deprecated and may be removed from future releases.
> Consider using the `dig' or `host' programs instead.  Run nslookup with
> the `-sil[ent]' option to prevent this message from appearing.
> Server:         207.150.196.199
> Address:        207.150.196.199#53
>
> Non-authoritative answer:
> 166.107.196.151.in-addr.arpa    name = snort.sourcefire.com.
>
> Authoritative answers can be found from:
> 166.107.196.151.in-addr.arpa    nameserver = ns1.sourcefire.com.
> 166.107.196.151.in-addr.arpa    nameserver = ns2.sourcefire.com.
> ns1.sourcefire.com      internet address = 151.196.107.164
> ns2.sourcefire.com      internet address = 151.196.107.165
>
> ****************************************************************************************
> This message and any attachments are confidential to the ordinary user of
> the e-mail address to which it was addressed and may also be privileged.
> If you are not the addressee you may not copy, forward, disclose or use
> any part of the message or its attachments and if you have received this
> message in error, please notify the sender immediately by return e-mail and
> delete it from your system.
> Internet communications cannot be guaranteed to be secure or error-free
> as information could be intercepted, corrupted, lost, arrive late or contain
> viruses. The sender therefore does not accept liability for any errors or
> omissions in the context of this message which arise as a result of Internet
> transmission.
> Northern Registrars Limited, Northern House, Woodsome Park, Fenay
> Bridge, Huddersfield. HD8 0LA.
> Tel: +44 (0) 1484 600900  Fax: +44 (0) 1484 600911
> For more information visit our web site: http://www.northernregistrars.co.uk 
> ****************************************************************************************


Note: The information contained in this message may be privileged and confidential and protected from disclosure.  If 
the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this 
message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this 
communication is strictly prohibited. If you have received this communication in error, please notify us immediately by 
replying to the message and deleting it from your computer.  Thank you.  Wagner Weber & Williams



****************************************************************************************
This message and any attachments are confidential to the ordinary user of
the e-mail address to which it was addressed and may also be privileged.
If you are not the addressee you may not copy, forward, disclose or use 
any part of the message or its attachments and if you have received this
message in error, please notify the sender immediately by return e-mail and
delete it from your system.
Internet communications cannot be guaranteed to be secure or error-free 
as information could be intercepted, corrupted, lost, arrive late or contain
viruses. The sender therefore does not accept liability for any errors or
omissions in the context of this message which arise as a result of Internet
transmission.
Northern Registrars Limited, Northern House, Woodsome Park, Fenay 
Bridge, Huddersfield. HD8 0LA.
Tel: +44 (0) 1484 600900  Fax: +44 (0) 1484 600911
For more information visit our web site: http://www.northernregistrars.co.uk
****************************************************************************************


_______________________________________________
Snort-users mailing list
Snort-users () lists sourceforge net
Go to this URL to change user options or unsubscribe:
https://lists.sourceforge.net/lists/listinfo/snort-users
Snort-users list archive:
http://www.geocrawler.com/redir-sf.php3?list=snort-users