alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike Beacon Activity (Wordpress Profile)"; flow:established,to_server; http.uri; content:"/logo.html"; bsize:10; http.cookie; content:"wordpress_logged_in="; startswith; fast_pattern; pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R"; http.header_names; content:!"Referer"; reference:md5,6517eadd2e4fb8fdf1f64a601e5a2b59; reference:url,twitter.com/MichalKoczwara/status/1385679642791665668; classtype:trojan-activity; sid:2032824; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_04_23, deployment Perimeter, confidence Medium, signature_severity Major, tag c2, updated_at 2021_04_23, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)