alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Grimagent CnC Activity"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/gate.php"; endswith; fast_pattern; http.header; header_lowercase; content:"|0d 0a|keep-alive|3a 20|"; content:"|0d 0a|connection|3a 20|keep-alive|0d 0a|referer|3a 20|https|3a 2f 2f|www|2e|"; distance:3; within:50; pcre:"/^(?:(?:youtub|googl)e|microsoft|amazon|ebay).com\x0d\x0a/Rsi"; http.request_body; content:!"&"; pcre:"/^[A-Za-z0-9]{3,25}=[a-f0-9]{28,}$/s"; reference:md5,d0ef174669abc7d6358531002e458df1; classtype:trojan-activity; sid:2034179; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_10_29, deployment Perimeter, malware_family Win32_Grimagent, confidence High, signature_severity Major, updated_at 2024_04_21;)