alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Possible BACKSWING JS Framework POST Observed"; flow:established,from_server; http.stat_code; content:"200"; http.header; content:"Access-Control-Allow-Methods|3a 20|POST"; http.content_type; content:"application/json"; startswith; file.data; content:"|7b 22|InjectionType|22 3a|"; depth:17; fast_pattern; content:"|22|InjectionString|22 3a 22|"; distance:0; reference:url,www.fireeye.com/blog/threat-research/2017/10/backswing-pulling-a-badrabbit-out-of-a-hat.html; classtype:trojan-activity; sid:2024932; rev:3; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2017_10_26, deployment Perimeter, confidence Medium, signature_severity Minor, updated_at 2020_08_13;)