alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/jquery-ajaxSuccess.js"; fast_pattern; bsize:22; http.cookie; content:"__cfduid="; startswith; pcre:"/^[a-zA-Z0-9_-]{171}$/R"; reference:md5,cc13942c46fb85a5754570c2b2c06e35; classtype:trojan-activity; sid:2034057; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_09_30, deployment Perimeter, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2021_09_30, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;)