alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE [PTsecurity] Possible Cobalt Strike payload"; flow:established,from_server; http.stat_code; content:"200"; http.header; content:"Content-Length|3a 20|"; content:"|0d 0a|"; distance:5; within:4; file.data; content:"|fc e8 00 00 00 00 eb|"; depth:7; fast_pattern; classtype:targeted-activity; sid:2024771; rev:3; 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 2020_08_28;)