alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING Suspicious Empty Accept-Encoding Header"; flow:established,to_server; http.header; header_lowercase; content:"accept-encoding|3a 20 0d 0a|"; fast_pattern; nocase; classtype:unknown; sid:2043026; rev:3; metadata:created_at 2022_12_28, deployment Perimeter, performance_impact Moderate, confidence Medium, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_26;)