Re: Need help to detect BOTNET-CNC Palevo bot DNS attack

[babu dheen <babudheen () yahoo co in>]

Dear James,
 
 Thanks for your response. Actually i have two query on your update.
 
1. You mentioned that since data content contains malicious code, this siganture fires, but i would like to update you 
that when this signature fires, source and destination IP showing DNS servers only (not infected client IP). Do you 
mean that when infected client makes DNS query to CNC botnet URL, DNS query itself contain malicious content?
 
2. If you consider any small company network, all internal machines would be pointed to company internal DNS server and 
internal DNS server will be pointed to ISP DNS server. 
   So if this signature fires, will we never see true client IP address in any network?
 
3. Sorry, i am not familiar with snort signatures and hence i am not able to understand your query.
 
 I will be happy if you can provide more details on this.
 
Regards
Babu
 


--- On Sun, 11/12/11, James Lay <jlay () slave-tothe-box net> wrote:


From: James Lay <jlay () slave-tothe-box net>
Subject: Re: [Snort-users] Need help to detect BOTNET-CNC Palevo bot DNS attack
To: "Snort" <snort-users () lists sourceforge net>
Date: Sunday, 11 December, 2011, 8:08 PM






On Dec 11, 2011, at 12:23 AM, babu dheen wrote:






Dear,
 
 We are using Astaro Firewall with IPS in pass through mode for last one year. We have been noticing  many number of  
"BOTNET-CNC Palevo bot DNS request for C&C attempt" attack showing in IPS summery report wherein source address and 
destination address showing only DNS server which source address is my company internal DNS server and destination is 
ISP DNS server.
 
We would like to find out the botnet infected clients which this IPS report shows. To help on this, we would like to 
know from which central URLs snort is downloading malware domains in its database so that we can refer the common URL 
against the DNS logs and find out the infected clients list.
 
I need your valuable help and guidelines on this.
 
Note: As you know, Astaro firewall is using Snort signature for IPS functionality. 
  





Rule ID

Rule Nmae

Group

Events


16297

BOTNET-CNC Palevo bot DNS
request for C&C attempt

Server

1018
 
 
Regards
Babu




Look at the rule dude:


alert udp $HOME_NET any -> $EXTERNAL_NET 53 (msg:"BOTNET-CNC Palevo bot DNS request for C&C attempt"; flow:to_server; 
content:"butterfly|05|sinip|02|es"; nocase; metadata:impact_flag red, policy balanced-ips drop, policy security-ips 
drop, service dns; 
reference:url,www.virustotal.com/analisis/c790a26f38070632759f481a87ed60c1628dea723ad63577cfe373de6b81e0a7-1249566492; 
classtype:trojan-activity; sid:16297; rev:3;)


Looks like it's not concerned with a list, but with data content.  I'd turn on DNS logging on your internal server to 
find out which internal machines may be infected.  Hope that helps.


James
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------------------------------------------------------------------------------
Learn Windows Azure Live!  Tuesday, Dec 13, 2011
Microsoft is holding a special Learn Windows Azure training event for 
developers. It will provide a great way to learn Windows Azure and what it 
provides. You can attend the event by watching it streamed LIVE online.  
Learn more at http://p.sf.net/sfu/ms-windowsazure

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