alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE GCleaner Downloader Activity M5"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?pub=mix"; fast_pattern; http.content_type; content:"application/x-www-form-urlencoded"; bsize:33; http.user_agent; content:!"Mozilla"; content:"-"; offset:2; depth:1; content:"-"; distance:0; http.header_names; content:!"Referer"; reference:md5,064f0d6900675bed580da1291a566cfa; classtype:command-and-control; sid:2033995; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_09_21, deployment Perimeter, malware_family GCleaner, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_21;)