alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE FakeAV Landing Page (aid sid)"; flow:established,to_server; http.method; content:"GET"; nocase; http.uri; content:".php?aid="; nocase; fast_pattern; content:"&sid="; nocase; pcre:"/[a-z]+\.php\?aid=\d+&sid=[a-z0-9]+$/i"; http.header_names; content:!"Referer|0d 0a|"; nocase; reference:url,www.bleepingcomputer.com/forums/lofiversion/index.php/t247125.html; classtype:trojan-activity; sid:2010625; rev:9; metadata:created_at 2010_07_30, signature_severity Major, updated_at 2020_08_06;)