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List:       snort-sigs
Subject:    [Snort-sigs] =?utf-8?q?TROJ=5FNAIKON=2EA_sig?=
From:       James Lay <jlay () slave-tothe-box ! net>
Date:       2013-04-26 19:35:03
Message-ID: a86ec7f741e539fdf6d57f0f1f9857fb () localhost
[Download RAW message or body]

And another (slow day)

alert tcp $HOME_NET any -> $EXTERNAL_NET 443 
(msg:"INDICATOR-COMPROMISED TROJ_NAIKON.A User-Agent"; 
flow:to_server,established; content:"User-Agent|3A| NOKIAN95|2f|WEB"; 
http_header; fast_pattern:only; metadata:policy balanced-ips drop, 
policy security-ips drop, service http; 
reference:url,http://blog.trendmicro.com/trendlabs-security-intelligence/targeted-attack-campaign-hides-behind-ssl-communication/; \
 classtype:trojan-activity; sid:10000050; rev:1;)

I'm thinking file_data isn't needed as we're just looking at headers?

James

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