alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike Beacon (Custom Wordpress Profile)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".html"; endswith; http.cookie; content:"wordpress_"; startswith; fast_pattern; pcre:"/^(?:[a-f0-9]{32})=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R"; http.header_names; content:"|0d 0a|Accept|0d 0a|Host|0d 0a|Cookie|0d 0a|"; startswith; content:!"Referer"; reference:md5,926ecee0190a5211a9670f369007ec3a; reference:url,thedfirreport.com/2021/08/16/trickbot-leads-up-to-fake-1password-installation/; classtype:command-and-control; sid:2033810; rev:2; metadata:attack_target Client_Endpoint, created_at 2021_08_26, deployment Perimeter, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2023_04_17, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;)