alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Zbot/Zeus Dropper Infection - /loads.php"; flow:established,to_server; http.uri; content:"/loads.php"; content:"?r="; http.header; content:"Cache-Control|3a 20|no-cache|0d 0a|"; http.user_agent; content:"Microsoft Internet Explorer"; depth:27; http.host; content:"knocker"; startswith; classtype:trojan-activity; sid:2009213; rev:9; metadata:created_at 2010_07_30, signature_severity Major, updated_at 2020_10_19;)