[Snort-sigs] [SPAM] Re: C2 - Zeus?

rmkml rmkml at ...174...
Thu Jun 13 15:17:50 EDT 2013


Hi Paul and Joel,

Thx you for sharing and comments,

Joel: Im curious why Sourcefire VRT rule sets contains {1} on this 
few rules please ? (maybe already fixed ??)
sid 23137 rev 6: ...(\s*\x27\s*|\s*\&\#39\;\s*|\s*\&\#x27\;\s*|\s*\\u0027\;\s*){1}...
sid 23136 rev 6: ...(\s*\x27\s*|\s*\&\#39\;\s*|\s*\&\#x27\;\s*|\s*\\u0027\;\s*){1}...
sid 4638 rev 4: ...\x01.{1}...
sid 15709 rev 11: ...\d{1}...
sid 25588 rev 1: ...\d{1}...
sid 23257 rev 3: ...[0-9a-f]{1}...
...

Regards
@Rmkml


On Thu, 13 Jun 2013, Joel Esler wrote:

> Paul,
> A couple comments, 
> 
> In your pcre you end with "id\=[0-9]{2,}", is there something after the two digits?  or does it end there?  (Can we do "id\=[0-9]{2}$")  As it stands right there, "2," will keep searching on and on.
> 
> Also, [a-zA-Z]{1}…  The {1} is unnecessary in this case.
> 
> Any pcaps here?
> 
> 
> On Jun 13, 2013, at 7:28 AM, Paul Bottomley <Paul.Bottomley at ...3813...> wrote:
>
>       Might need running in your test lab for a week or so to see what it picks up… From observation so no reference.
>  
> alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.Zeus outbound connection"; flow:established,to_server; content:"/images/"; fast_pattern:only; http_uri;
> pcre:"/\/images\/[a-zA-Z]{1}\.php\?id\=[0-9]{2,}/Ui"; classtype:trojan-activity; sid:xxxxxx; rev:1;)
>  
> Thanks


More information about the Snort-sigs mailing list