Re: Zbot variant sigs

[Y M <snort () outlook com>]

Hi Joel,
You are absolutely right. Reading your comment and revising the rule as well as reading the file_data documentation 
again now I see why. I misinterpreted the purpose of the file_data. I went back to the test box and the part 
(file_data; content:"swift_copy.exe") is not included in the rule, I added it afterwards, hmmm...
That part certainly needs to go away. Thanks for pointing it out and explaining it.YM

Subject: Re: [Snort-sigs] Zbot variant sigs
From: jesler () sourcefire com
Date: Fri, 11 Oct 2013 14:21:56 -0400
CC: snort-sigs () lists sourceforge net
To: snort () outlook com

On Oct 10, 2013, at 4:43 AM, Y M <snort () outlook com> wrote:
alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-OTHER Zbot variant malware potential download from 
phishing attack"; content:"/image/swift_copy.zip"; fast_pattern:only; http_uri; file_data; content:"swift_copy.exe"; 
metadata: policy security-ips drop, ruleset community, service http; 
reference:url,www.virustotal.com/en/file/27e6f24e8ddfd5137a08c527c0e9b8b47d81303cbaa4e4fee4586699a31640f4/analysis/1381340916/;
 classtype:trojan-activity; sid:100060; rev:1;)
That shouldn’t work, you have an outbound rule, but you are looking for the file being downloaded in the return 
(“file_data; content:”swift_copy.exe”)
--
Joel Esler
Senior Research Engineer, VRT
OpenSource Community Manager
AEGIS Intelligence Lead

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