alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING GENERIC SUSPICIOUS POST to Dotted Quad with Fake Browser 2"; flow:established,to_server; http.method; content:"POST"; http.user_agent; content:"|20|Firefox/"; nocase; fast_pattern; http.host; pcre:"/^(?:\d{1,3}\.){3}\d{1,3}/"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; content:!"|0d 0a|x-requested-with"; content:!"|0d 0a|accept"; content:!"|0d 0a|user-agent|0d 0a|"; content:!"|0d 0a|cache-"; content:!"|0d 0a|pragma"; content:!"|0d 0a|referer|0d 0a|"; classtype:bad-unknown; sid:2018359; rev:6; metadata:created_at 2014_04_04, performance_impact Significant, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_05_06;)