Re: Zbot/Simda sig

[Y M <snort () outlook com>]

adding pcaps.

From: snort () outlook com
To: snort-sigs () lists sourceforge net
Date: Thu, 10 Oct 2013 15:25:01 +0000
Subject: [Snort-sigs] Zbot/Simda sig




I was looking at a specific capture triggered by several alerts of sid:26369. Along the packets there were three 
attempts made to download an executable file "calc.exe". The download was prevented, however, I downloaded the file and 
came up with the below rule. VT results are mostly mixed between Zbot, Simda, and Kazy.
alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-CNC Win.Trojan.Zbot/Simda outbound connection 
attempt"; flow:to_server,established; content:"/?"; http_uri; pcre:"/\/?[0-9A-Za-z]=%/"; fast_pattern; http_uri; 
content:"|25|96|25|CB|25|D5|25|A8|25|A7|25|"; http_raw_uri; metadata:impact_flag red, policy balanced-ips drop, policy 
security-ips drop, ruleset community, service http; 
reference:url,www.virustotal.com/en/file/80ea92e508eefa5722870c6ca48a6a1086180c754dd83cf4ebd28bf3918c2392/analysis/;sid:100065;
 rev:1;)
Thanks.YM                                         

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Attachment: zbot_simda_http.pcap
Description:

------------------------------------------------------------------------------
October Webinars: Code for Performance
Free Intel webinars can help you accelerate application performance.
Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from 
the latest Intel processors and coprocessors. See abstracts and register >
http://pubads.g.doubleclick.net/gampad/clk?id=60134071&iu=/4140/ostg.clktrk

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