alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET DELETED Possible IE 0day CVE-2013-3918 4"; flow:established,from_server; file_data; content:"19916E01-B44E-4E31-94A4-4696DF46157B"; nocase; content:"|25|u"; content:"|25|u"; distance:4; within:4; content:"|25|u"; distance:4; within:4; pcre:"/^\{?[a-fA-F0-9]{4}\}?(\x25u\{?[a-fA-F0-9]{4}\}?){20}/Rs"; reference:url,www.fireeye.com/blog/technical/cyber-exploits/2013/11/operation-ephemeral-hydra-ie-zero-day-linked-to-deputydog-uses-diskless-method.html; classtype:attempted-user; sid:2017709; rev:4; metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2013_11_12, deployment Perimeter, signature_severity Major, tag Web_Client_Attacks, updated_at 2022_06_29;)