alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT Microsoft Excel file download - SET 1"; flow:established,from_server; flowbits:isset,OLE.CompoundFile; file_data; content:"|09 08 10 00 00 06 05 00|"; distance:512; content:"|57006F0072006B0062006F006F006B00|"; fast_pattern; flowbits:set,ETPRO.Microsoft.Excel; flowbits:noalert; reference:cve,2012-0185; classtype:attempted-user; sid:2025086; rev:7; metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2012_05_10, cve CVE_2012_0185, deployment Perimeter, confidence Medium, signature_severity Major, tag Web_Client_Attacks, updated_at 2019_10_08;)