ET MALWARE Zebrocy Screenshot Upload

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Zebrocy Screenshot Upload";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.request_body;
    pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})+/";
    http.accept;
    content:"text/html, */*"; depth:14; endswith;
    http.accept_enc;
    content:"identity"; depth:8; endswith;
    http.content_len;
    byte_test:0,>,50000,0,string,dec;
    byte_test:0,<,120000,0,string,dec;
    http.start;
    content:".php HTTP/1.0|0d 0a|Connection|3a 20|keep-alive|0d 0a|Content-Type|3a 20|application/x-www-form-urlencoded|0d 0a|Content-Length|3a 20|"; fast_pattern;
    http.header_names;
    content:!"User-Agent|0d 0a|";
    reference:md5,5b2eca6abe1903955d1dfd41e301e0af;
    classtype:targeted-activity;
    sid:2030122; rev:4;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_04_23, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_17;
)