alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET WEB_CLIENT Office Requesting .HTA File Likely CVE-2017-0199 Request"; flow:established,to_server; http.uri; content:".hta"; nocase; fast_pattern; http.user_agent; content:"Microsoft Office"; startswith; http.header_names; content:!"Referer|0d 0a|"; reference:cve,2017-0199; classtype:trojan-activity; sid:2024224; rev:4; 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, cve CVE_2017_0199, deployment Perimeter, malware_family Exploit_Kit_RIG, performance_impact Low, confidence Medium, signature_severity Major, tag Exploit_kit_RIG, tag CISA_KEV, updated_at 2020_10_09;)