alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT Great Cannon DDoS JS M4"; flow:established,to_client; http.stat_code; content:"200"; file.data; content:"var _a|3d 22|"; depth:8; content:"|22 2c|_b|3d 22|"; within:120; content:"|22 2c|_c|3d 22|"; within:120; content:"|22 3b|eval|28|function|28 5f 2c|"; within:120; content:"|29 7b|if|28|n|3d|function|28 5f 29 7b|return|28 5f|"; distance:9; within:27; fast_pattern; reference:url,citizenlab.ca/2015/04/chinas-great-cannon/; reference:url,twitter.com/chrisdoman/status/1168576334777454594; classtype:attempted-dos; sid:2027964; rev:4; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2019_09_06, deployment Perimeter, signature_severity Minor, updated_at 2020_11_19;)