alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Suspicious User-Agent (Huai_Huai)"; flow:to_server,established; http.user_agent; content:"Huai_Huai"; depth:9; endswith; reference:md5,ee600bdcc45989750dee846b5049f935; reference:md5,91b9aa25563ae524d3ca4582630eb8eb; reference:md5,1051f7176fe0a50414649d369e752e98; classtype:pup-activity; sid:2006361; rev:12; metadata:affected_product Any, attack_target Client_Endpoint, created_at 2010_07_30, deployment Perimeter, confidence High, signature_severity Minor, tag User_Agent, updated_at 2020_10_19;)