alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE GCleaner Downloader Activity M1"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?pub=mix"; fast_pattern; http.user_agent; content:!"Mozilla/"; content:"-"; offset:4; depth:1; content:"-"; distance:4; within:1; content:"-"; distance:4; within:1; bsize:19; reference:md5,ff4ae9d00058d3e9d5034d043387c4be; reference:url,medium.com/csis-techblog/gcleaner-garbage-provider-since-2019-2708e7c87a8a; classtype:trojan-activity; sid:2032349; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_03_30, deployment Perimeter, malware_family GCleaner, performance_impact Low, confidence High, signature_severity Major, tag Downloader, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_03_30;)