ET WEB_CLIENT Internet Explorer Memory Corruption Vulnerability (CVE-2015-2444)

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET WEB_CLIENT Internet Explorer Memory Corruption Vulnerability (CVE-2015-2444)";
    flow:from_server,established;
    file_data;
    content:"<style"; nocase;
    pcre:"/^[^>]*?>\s*?form\s*?\{\s*?-ms-behavior\s*?\x3a\s*?url/Rsi";
    content:"x-ua-compatible"; nocase;
    pcre:"/^[\x22\x27]\s*content\s*=\s*[\x22\x27]\s*IE\s*=\s*10/Rsi";
    content:"<button"; nocase;
    content:"<label"; nocase; distance:0;
    content:"<form"; nocase; distance:0;
    content:"<meter"; nocase; distance:0;
    content:"<optgroup"; nocase; distance:0;
    content:"<meter"; nocase; distance:0;
    content:"-ms-behavior"; nocase; fast_pattern;
    reference:cve,2015-2444;
    classtype:attempted-user;
    sid:2021709; rev:5;
    metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2015_08_24, cve CVE_2015_2444, deployment Perimeter, confidence Medium, signature_severity Major, tag Web_Client_Attacks, updated_at 2019_10_08;
)