alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike Malleable C2 (Adobe RTMP)"; flow:established,to_server; http.user_agent; bsize:15; content:"Shockwave Flash"; http.cookie; bsize:172; content:"="; offset:171; depth:1; endswith; pcre:"/^[a-zA-Z0-9\/+]{171}=$/"; http.request_line; bsize:31; content:"GET|20|/idle/1376547834/1|20|HTTP/1.1"; fast_pattern; http.content_type; content:"application/x-fcs"; http.header_names; content:!"Referer"; reference:url,github.com/rsmudge/Malleable-C2-Profiles/blob/master/normal/rtmp.profile; classtype:command-and-control; sid:2029744; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_03_26, deployment Perimeter, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2024_04_04, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;)