alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT Office Discovery HTA file Likely CVE-2017-0199 Request M2"; flow:established,to_client; flowbits:isset,Office.UA; http.content_type; content:"application/hta"; nocase; endswith; fast_pattern; reference:cve,cve-2017-0199; classtype:trojan-activity; sid:2024226; rev:3; 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, confidence Medium, signature_severity Major, tag Exploit_kit_RIG, tag CISA_KEV, updated_at 2020_10_09;)