alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike Malleable C2 (WooCommerce Profile)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/ba.html"; bsize:8; fast_pattern; http.cookie; content:"woocommerce_items_in_cart="; startswith; pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R"; reference:md5,68abb4a9c6203acca940a49157264497; reference:url,twitter.com/_brettfitz/status/1404095220506103812; classtype:command-and-control; sid:2033141; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_06_15, deployment Perimeter, deployment SSLDecrypt, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2021_06_15, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;)