ET MALWARE Possible Schneebly Posting ScreenShot

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE Possible Schneebly Posting ScreenShot";
    flow:established,to_server;
    http.method;
    content:"POST"; nocase;
    http.uri;
    content:"/viewimage.php?s="; nocase;
    content:!"&"; distance:0;
    http.header_names;
    content:!"Referer|0d 0a|";
    http.request_body;
    content:"filename=";
    content:"JFIF"; distance:0;
    reference:url,www.alienvault.com/open-threat-exchange/blog/microsoft-office-zeroday-used-to-attack-pakistani-targets;
    classtype:trojan-activity;
    sid:2017689; rev:3;
    metadata:created_at 2013_11_07, confidence Medium, signature_severity Major, updated_at 2020_04_27;
)