alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE GCleaner Downloader Activity M11"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/api/files/client/s"; fast_pattern; isdataat:!3,relative; http.user_agent; content:"|7c|"; offset:3; depth:1; content:"|7c|"; offset:11; depth:1; content:"|7c|"; offset:14; depth:1; pcre:"/^[A-Za-z0-9#]{3}\|[A-Za-z0-9#]{7}\|[A-Za-z0-9#]{2}\|[A-Za-z0-9#]{4}$/"; http.host; pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/"; threshold:type limit, track by_src, seconds 180, count 1; reference:md5,51162ded57e5aeda4eb0bbe6ed5d52f0; classtype:trojan-activity; sid:2049040; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_and_Server, created_at 2023_11_01, deployment Perimeter, malware_family GCleaner, performance_impact Moderate, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_11_01, reviewed_at 2023_11_01; target:src_ip;)