alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/ViSystem CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php?hwid="; fast_pattern; content:"&pwd="; content:"&cc="; content:"&fz="; content:"&df="; content:"&wlt="; http.header_names; content:!"Referer"; reference:md5,9b0aa282698db89034d254076dd03e26; classtype:command-and-control; sid:2029212; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_12_31, deployment Perimeter, malware_family ViSystem, confidence High, signature_severity Major, updated_at 2019_12_31;)