alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Echelon/Mist Stealer CnC Activity"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?alias="; fast_pattern; content:"&data="; distance:0; http.header_names; content:"|0d 0a|Host|0d 0a|"; depth:8; pcre:"/^(Connection\x0d\x0a)?\x0d\x0a$/R"; content:!"User-Agent"; content:!"Referer"; content:!"Accept"; reference:md5,5c7638d8247e6da38835daa8a63a0a60; classtype:trojan-activity; sid:2030316; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_06_11, deployment Perimeter, confidence High, signature_severity Major, updated_at 2020_06_11;)