alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike Malleable C2 (Unknown Profile)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/fam_newspaper"; startswith; http.accept; content:"image/*"; bsize:7; http.user_agent; content:"Mozilla/5.0 (Linux|3b 20|Android 8.0.0|3b 20|SM-G960F Build/R16NW) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202"; bsize:112; http.cookie; content:"wordpress_logged_in="; startswith; pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R"; reference:md5,efb5212c17a7cd05e087ef7a5655b4aa; classtype:command-and-control; sid:2032956; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_05_13, deployment Perimeter, 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;)