alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Likely Hostile HTTP Header GET structure"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php"; nocase; http.start; content:"|20|HTTP/1.0|0d 0a|User-Agent|3a 20|"; fast_pattern; content:"|0d 0a|Host|3a 20|"; content:"|0d 0a|Pragma|3a 20|no-cache|0d 0a|"; distance:0; http.host; content:!"update.nai.com"; content:!"toolbarqueries.google."; content:!".ceipmsn.com"; content:!"stats.mbamupdates.com"; classtype:trojan-activity; sid:2011858; rev:13; metadata:created_at 2010_10_27, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_02_14;)