[Snort-sigs] Proposed Signature - "COMMUNITY SPECIFIC-THREATS - Bredolab infected asset POSTing check-in"

Joel Esler jesler at ...435...
Mon Mar 12 14:39:07 EDT 2012


Nathan --

I rewrote the rule as such:

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"BOTNET-CNC Trojan.Bredolab variant outbound connection"; flow:to_server,established; content:"POST"; http_method; content:"User-Agent|3A 20|Mozilla/4.0|0D 0A|"; http_header; content:"smk="; depth:4; http_client_body; reference:url,www.virustotal.com/file/9384733182a6cbe5236b9b253d1f070570b7f6b6ff31aa86be253421f4c5c645/analysis/; classtype:trojan-activity; sid:21562; rev:1;)
Do you see anything wrong there?  I tested it against the pcap you sent us as well as an internally generated pcap against the family of malware. And it fires fine.

J

On Mar 12, 2012, at 10:16 AM, Community Proposed wrote:

> alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"COMMUNITY
> SPECIFIC-THREATS - Bredolab infected asset POSTing check-in";
> flow:to_server,established; content:"POST"; http_method; content:"User-Agent:
> Mozilla/4.0|0d 0a|Host: "; http_header; file_data; content:"smk=";
> pcre:"/^smk=[^&\?]+/"; classtype:trojan-activity; sid:x; rev:1;)
> 
> 
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