[Snort-sigs] Unknown Botnet sig

James Lay jlay at ...3266...
Thu Jul 11 18:47:17 EDT 2013


On 2013-07-11 16:29, rmkml wrote:
> Hi James,
>
> Thx for sharing rule,
>
> maybe add before first content : /?
> and ending first content : &k=
>
> like this: content:"/?f=sm_main.mp3&k="; ...
>
> Regards
> @Rmkml
>
>
> On Thu, 11 Jul 2013, James Lay wrote:
>
>> Would be nice to put a name to this if anyone has any other info on 
>> it:
>>
>> alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS 
>> (msg:"MALWARE-CNC
>> Win.Trojan.Kuluoz variant outbound connection";
>> flow:to_server,established; content:"f=sm_main.mp3"; 
>> fast_pattern:only;
>> http_uri; pcre:"/[a-f0-9]{10}/\x3ff=sm_main.mp3\x26k=[0-9]{15}/U";
>> metadata:policy balanced-ips drop, policy security-ips drop, service
>> http;
>> 
>> reference:url,http://research.zscaler.com/2013/07/tracking-botnet-infection.html;
>> classtype:trojan-activity; sid:10000087; rev:1;)
>>
>> James
> k

Ah good call RM...thank you...new one below:

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC 
Win.Trojan.Kuluoz variant outbound connection"; 
flow:to_server,established; content:"/?f=sm_main.mp3&k="; 
fast_pattern:only; http_uri; 
pcre:"/[a-f0-9]{10}/\x3ff=sm_main.mp3\x26k=[0-9]{15}/U"; metadata:policy 
balanced-ips drop, policy security-ips drop, service http; 
reference:url,http://research.zscaler.com/2013/07/tracking-botnet-infection.html; 
classtype:trojan-activity; sid:10000087; rev:2;)

James




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