alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT MSXMLHTTP Download of HTA (Observed in CVE-2017-0199)"; flow:established,from_server; flowbits:isset,et.IE7.NoRef.NoCookie; http.content_type; content:"application/hta"; fast_pattern; nocase; bsize:15; classtype:trojan-activity; sid:2024197; rev:6; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_04_11, cve CVE_2017_0199, deployment Perimeter, performance_impact Low, signature_severity Major, tag CISA_KEV, updated_at 2020_11_19;)