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;)