alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Unk.BrowserStealer CnC Keep-Alive"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php?"; pcre:"/^(?:-[0-9]+|[A-F0-9]{32})=1$/Rsi"; content:"=1"; endswith; http.request_body; content:"ping|7c|"; bsize:5; fast_pattern; http.header_names; content:!"Referer"; reference:md5,32642964fff0c97179d75086f515f5fe; classtype:command-and-control; sid:2029145; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_12_13, deployment Perimeter, malware_family Win32_Unk_BrowserStealer, confidence High, signature_severity Major, updated_at 2020_08_19;)