alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike Malleable C2 (Magnitude EK)"; flow:established,to_server; urilen:>235; http.request_line; content:"GET|20|/themes/index.php?id="; fast_pattern; http.uri; content:"/themes/index.php?id="; startswith; pcre:"/^[a-z]{200,}$/Rs"; http.accept; content:"image/jpeg, application/*"; bsize:25; reference:url,github.com//rsmudge/Malleable-C2-Profiles/blob/master/crimeware/magnitude.profile; classtype:command-and-control; sid:2029741; rev:1; 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 2020_03_26, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;)