alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike Beacon Activity (Wordpress Profile)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/ku?disable="; startswith; fast_pattern; http.cookie; content:"wordpress_logged_in="; startswith; pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R"; http.header_names; content:!"Referer"; reference:md5,661bdbab0140cf3bed508a14c2c5804a; classtype:trojan-activity; sid:2032339; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_03_26, deployment Perimeter, confidence Medium, signature_severity Major, tag c2, updated_at 2021_03_26, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)