Re: Quick rule question

[Joel Esler <jesler () sourcefire com>]

On Oct 19, 2012, at 11:23 AM, James Lay <jlay () slave-tothe-box net> wrote:
> On 2012-10-19 08:39, Joel Esler wrote:
> > content:".htm"; content:"|22|"; distance:0; within:2; pcre:"/\/html?\x22/";
> >
> > Something like that?
> > Is that what you are trying to do?
> >
> > --
> > Joel Esler
> > Senior Research Engineer, VRT
> > OpenSource Community Manager
> > Sourcefire
> >
> > On Oct 19, 2012, at 10:24 AM, James Lay <jlay () slave-tothe-box net> wrote:
> >
> > > Hey all,
> > >
> > > Quick question...trying to match:
> > >
> > > .htm"  OR  .html"
> > >
> > > my content can be htm and that's fine, but I need to make sure to have
> > > the end quote at the end.
> > >
> > > Thanks all.
> > >
> > > James
>
> Thanks Joel and Mike,
>
> I'm trying to modify this rule to catch both .html" and .htm" as I've seen some changes:
>
> alert tcp $EXTERNAL_NET any -> $HOME_NET 25 (msg:"SPECIFIC-THREATS Blackhole exploit kit possible email Landing"; 
> flow:to_server,established; content:"href=|22|http|3a 2f 2f|"; content:"/index.html|22|"; distance:0; within:50; 
> pcre:"/\x2f[a-z0-9]{6,8}\x2findex\.html\x22/msi"; metadata:policy balanced-ips drop, policy security-ips drop, 
> service smtp; classtype:trojan-activity; sid:10000018; rev:4;)


We've seen some real positive results in the field with that rule (sid: 24171).  We get a FP every once in awhile, but 
for the most part, it's doing a great job.

--
Joel Esler
Senior Research Engineer, VRT
OpenSource Community Manager
Sourcefire
------------------------------------------------------------------------------
Everyone hates slow websites. So do we.
Make your web apps faster with AppDynamics
Download AppDynamics Lite for free today:
http://p.sf.net/sfu/appdyn_sfd2d_oct
_______________________________________________
Snort-sigs mailing list
Snort-sigs () lists sourceforge net
https://lists.sourceforge.net/lists/listinfo/snort-sigs
http://www.snort.org


Please visit http://blog.snort.org for the latest news about Snort!