ET MALWARE Backdoor.Win32.Pushdo.s Checkin

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Backdoor.Win32.Pushdo.s Checkin";
    flow:established,to_server;
    flowbits:set,ET.Pushdo.S;
    http.method;
    content:"POST";
    http.user_agent;
    content:"Mozilla/4.0 (compatible|3b 20|MSIE 6.0|3b 20|Windows NT 5.1|3b 20|SV1)"; fast_pattern;
    http.accept;
    content:"*/*";
    http.accept_lang;
    content:"en-us";
    http.content_type;
    content:"application/octet-stream";
    http.header_names;
    content:"|0d 0a|Accept|0d 0a|Accept-Language|0d 0a|Content-Type|0d 0a|Content-Length|0d 0a|User-Agent|0d 0a|Host|0d 0a|";
    content:!"|0d 0a|Referer|0d 0a|";
    threshold:type limit,track by_src,count 1,seconds 600;
    classtype:command-and-control;
    sid:2016867; rev:7;
    metadata:created_at 2013_05_21, performance_impact Significant, signature_severity Major, updated_at 2025_01_03;
)