ET MALWARE Win32/Unk.BrowserStealer CnC Keep-Alive

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;
)