alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE [PTsecurity] Possible Cobalt Strike payload"; flow:established,to_client; http.stat_code; content:"200"; http.content_len; byte_test:0,<,10000000,0,string,dec; byte_test:0,>,9999,0,string,dec; file.data; content:"|fc e8 00 00 00 00 eb|"; startswith; fast_pattern; classtype:targeted-activity; sid:2024771; rev:6; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_09_27, deployment Perimeter, malware_family Cobalt_Strike, performance_impact Low, confidence Medium, signature_severity Major, updated_at 2024_05_02;)