Re: Rule for detecting ssh

[Shirkdog <shirkdog () gmail com>]

And flip the logic of your signature. The SSH version will be returned by
the server.
On Jun 25, 2014 9:49 AM, "Joel Esler (jesler)" <jesler () cisco com> wrote:

>  Capture a pcap of an attempted connection to SSH on the server and then
> examine the pcap in something like wireshark to write the detection.
>
>  On Jun 25, 2014, at 9:25 AM, basant subba <basantsubba () gmail com> wrote:
>
>  Thanks Shirkdog but that doesn't seem to help much.
>
>
> On Wed, Jun 25, 2014 at 6:19 PM, Shirkdog <shirkdog () gmail com> wrote:
>
> > Add nocase; after your content.
> >  On Jun 25, 2014 7:48 AM, "basant subba" <basantsubba () gmail com> wrote:
> >
> > >   I want to write a rule to detect a ssh login attempt from HOME_NET to
> > > server with IP 172.16.24.253. How do I go about it? This is as far as I
> > > could get but it looks far from complete signature to detect ssh login
> > > attempt.
> > >
> > > alert tcp $HOME_NET any -> 172.16.24.253 22 (msg:"ssh Login Attempt";
> > > flow:established, to_server; content:"ssh "; sid:10000001; rev:1;)
> > >
> > >  How do I write the pcre part for this signature? Can any1 help?
> > >
> > >
> > >
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> ------------------------------------------------------------------------------
> Open source business process management suite built on Java and Eclipse
> Turn processes into business applications with Bonita BPM Community Edition
> Quickly connect people, data, and systems into organized workflows
> Winner of BOSSIE, CODIE, OW2 and Gartner awards
> http://p.sf.net/sfu/Bonitasoft
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------------------------------------------------------------------------------
Open source business process management suite built on Java and Eclipse
Turn processes into business applications with Bonita BPM Community Edition
Quickly connect people, data, and systems into organized workflows
Winner of BOSSIE, CODIE, OW2 and Gartner awards
http://p.sf.net/sfu/Bonitasoft

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