Re: [Emerging-Sigs] Linux/CDorked sig

[Will Metcalf <wmetcalf () emergingthreatspro com>]

Going to add something like this as well...

alert tcp $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"ET
CURRENT_EVENTS Possible Linux/Cdorked.A Incoming Command";
flow:established,to_server; content:"SECID="; nocase; fast_pattern:only;
content:"SECID="; nocase; http_cookie;
pcre:"/\/\?(?:4(?:4(?:3[123456789]|41|55)|c(?:3[123456789]|41))|5(?:354|431))/U";
classtype:attempted-user; sid:103; rev:1;)



On Fri, Apr 26, 2013 at 1:24 PM, Rodrigo Montoro(Sp0oKeR) <spooker () gmail com
> wrote:

> Awesome info here too
>
>
> http://www.welivesecurity.com/2013/04/26/linuxcdorked-new-apache-backdoor-in-the-wild-serves-blackhole/
>
> Regards,
>
>
> On Fri, Apr 26, 2013 at 3:03 PM, Will Metcalf <
> wmetcalf () emergingthreatspro com> wrote:
>
> > Thanks James, can probably limit to a-f0-9 on your char class and
> > probably want a \. match after to ensure it is exactly this and not
> > something like somethinglongerthan16charsaaaaaaaaa.foo.bar could also
> > anchor the match to a Location header. Nice sig... Will get something into
> > QA and out today based on this thanks!
> >
> > Regards,
> >
> > Will
> >
> >
> > On Fri, Apr 26, 2013 at 12:04 PM, James Lay <jlay () slave-tothe-box net>wrote:
> >
> > > Enjoy:
> > >
> > > alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any
> > > (msg:"INDICATOR-COMPROMISED Linux/CDorked redirect";
> > > flow:from_server,established; file_data; content:"index.php?j=";
> > > http_header; content:"302"; http_stat_code; pcre:"/http\x3a\x2f\x2f[0-9a-
> > > **z]{16}/m"; metadata:policy balanced-ips drop, policy security-ips
> > > drop, service http; reference:url,http://blog.**
> > > sucuri.net/2013/04/apache-**binary-backdoors-on-cpanel-**
> > > based-servers.html<http://blog.sucuri.net/2013/04/apache-binary-backdoors-on-cpanel-based-servers.html>;
> > > classtype:trojan-activity; sid:10000049; rev:1;)
> > >
> > > Ok Joel....how much cleanup is needed with this ;)
> > >
> > > James
> > > ______________________________**_________________
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> > >
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>
> --
> Rodrigo Montoro (Sp0oKeR)
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