Local.Rules rule misfiring

[Clint Conner <conner () plummerslade com>]

Greetings,

I have the following rule added to my local.rules file.  The rule it replaces is disabled in disabledsids.conf.  The 
rule is firing incorrectly, though.  It alerts on the first IP address, which is 188.172.212.76.  If I understand he 
rule correctly, it should not be alerting on this IP address.

alert tcp $HOME_NET any -> [!188.172.212.76,!208.87.232.0/21,$EXTERNAL_NET] $HTTP_PORTS (msg:"ET MALWARE User-Agent 
(Mozilla/4.0 (compatible))";flow:to_server,established; content:"User-Agent|3a| Mozilla/4.0 (compatible|29 0d 0a|"; 
fast_pattern:18,20; http_header; content:!"citrixonline.com"; http_header; 
reference:url,doc.emergingthreats.net/bin/view/Main/2008974; classtype:Trojan-activity; sid:900000010;rev:1;)

There are more IP address ranges that are ! out, but I have omitted them.  I copied the rule directly from the 
pulledpork file and just added the first IP address to it.  I still have alerts pouring in when anything goes to that 
first IP address.

Thank you,

-Clint

*************************
Clint J. Conner
Managed Services Manager
Plummer Slade, Inc.
"Computer Networking & IT Solutions"
428 Forbes Avenue, Suite 2450<x-apple-data-detectors://3/0>
Pittsburgh, PA 15219<x-apple-data-detectors://3/0>
Tel: 412.261.5600 x215<tel:412.261.5600;215>
Fax: 412.261.1528<tel:412.261.1528>
conner () plummerslade com<mailto:conner () plummerslade com>
www.plummerslade.com<http://www.plummerslade.com/>

"Exclusively endorsed for IT solutions by the Allegheny County Bar Association (ACBA)."

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