ET EXPLOIT_KIT Underminer EK IE Exploit

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET EXPLOIT_KIT Underminer EK IE Exploit";
    flow:established,to_client;
    file_data;
    content:"IE=EmulateIE9"; nocase;
    content:"</head"; nocase; within:200;
    content:"<body"; nocase; within:200;
    content:"<script"; nocase; within:200;
    content:"!!window.ActiveXObject"; nocase; within:200;
    content:"try"; within:200;
    content:"parent.parent.setLocalStoreUserData"; nocase; distance:0;
    pcre:"/^\s*\([\x22\x27][A-F0-9a-f]{32}[\x22\x27]\s*\)\s*\x3b\s*}\s*catch\s*\(e\)\s*\{\s*\}\s*\}\s*<\/script>\s*<\/body>/Rsi";
    classtype:exploit-kit;
    sid:2025911; rev:1;
    metadata:affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2018_07_26, deployment Perimeter, confidence High, signature_severity Major, tag Underminer_EK, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)