alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET WEB_CLIENT Office UA FB SET"; flow:established,to_server; flowbits:set,Office.UA; flowbits:noalert; http.user_agent; content:"Microsoft Office"; fast_pattern; startswith; http.header_names; content:!"Referer|0d 0a|"; reference:cve,cve-2017-0199; classtype:trojan-activity; sid:2024225; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2017_04_19, deployment Perimeter, malware_family Exploit_Kit_RIG, performance_impact Low, signature_severity Major, tag Exploit_kit_RIG, updated_at 2020_08_05;)