alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike Malleable C2 (Unknown Profile)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/remove"; startswith; fast_pattern; http.accept_lang; content:"en-GB|3b|q=0.9,|20|*|3b|q=0.7"; bsize:20; http.user_agent; content:"Mozilla/5.0 (Linux|3b 20|Android 7.0|3b 20|Pixel C Build/NRD90M|3b 20|wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0"; bsize:109; http.cookie; content:"wordpress_logged_in="; startswith; pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R"; reference:md5,bf8061539abbe6664924e37489a3751c; classtype:command-and-control; sid:2032957; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_05_13, deployment Perimeter, deployment SSLDecrypt, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2021_05_13, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;)