alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET WEB_CLIENT BeEF Cookie (BEEFHOOK)"; flow:established,to_server; threshold:type limit, track by_src, seconds 60, count 1; http.cookie; content:"BEEFHOOK="; startswith; fast_pattern; reference:url,github.com/beefproject/beef; classtype:attempted-user; sid:2038614; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_08_25, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_08_25;)