alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT Microsoft Rich Text File download - SET"; flow:from_server,established; file_data; content:"|7B 5C 72 74 66 31|"; within:6; flowbits:set,ET.http.rtf.download; flowbits:noalert; reference:cve,2012-0183; classtype:attempted-user; sid:2015790; rev:2; metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2012_10_10, cve CVE_2012_0183, deployment Perimeter, confidence Medium, signature_severity Major, tag Web_Client_Attacks, updated_at 2019_07_26;)