alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO GET Minimal HTTP Headers Flowbit Set"; flow:established,to_server; flowbits:set,min.gethttp; flowbits:noalert; http.method; content:"GET"; http.header_names; content:!"Accept"; content:!"If-"; content:!"Referer"; content:!"User-Agent"; content:!"Content"; classtype:bad-unknown; sid:2016537; rev:5; metadata:created_at 2013_03_06, performance_impact Significant, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_22;)