ET MALWARE TrueBot/Silence.Downloader CnC Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE TrueBot/Silence.Downloader CnC Checkin";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:".php"; endswith;
    http.request_body;
    content:"Content-Disposition|3a 20|form-data|3b 20|name=|22|file|22 3b 20|filename=|22|C|3a 5c|";
    content:".DAT|22 3b 0d 0a|"; distance:0;
    content:"|0d 0a|Host Name|3a 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20|"; distance:0;
    content:"|0d 0a|OS Name|3a 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20|"; distance:0;
    content:"|0d 0a|OS Version|3a 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20|"; distance:0;
    http.header_names;
    content:!"Referer";
    content:!"User-Agent";
    content:!"Accept";
    reference:md5,c2a00949ddacfed9ed2ef83a8cb44780;
    classtype:command-and-control;
    sid:2026559; rev:4;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_10_29, deployment Perimeter, malware_family TrueBot, malware_family Silence_Downloader, performance_impact Moderate, confidence High, signature_severity Major, updated_at 2020_09_16;
)