[Snort-users] Need help to detect BOTNET-CNC Palevo bot DNS attack

babu dheen babudheen at ...5176...
Sun Dec 11 11:53:06 EST 2011

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.

--- On Sun, 11/12/11, James Lay <jlay at ...13475...> wrote:

From: James Lay <jlay at ...13475...>
Subject: Re: [Snort-users] Need help to detect BOTNET-CNC Palevo bot DNS attack
To: "Snort" <snort-users at lists.sourceforge.net>
Date: Sunday, 11 December, 2011, 8:08 PM

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

 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




request for C&C attempt



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.

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