alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT BeEF Related JS Activity M4"; flow:established,to_client; file.data; content:"await|20|window.flk.start|28|window.flk.url.beef|29|"; fast_pattern; reference:url,beefproject.com/; classtype:attempted-user; sid:2052509; rev:1; metadata:attack_target Client_Endpoint, created_at 2024_05_08, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_05_08, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1189, mitre_technique_name Drive_by_Compromise; target:dest_ip;)