alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT HTA File Download Flowbit Set"; flow:established,to_client; flowbits:set,et.http.hta; flowbits:noalert; http.content_type; content:"application/hta"; fast_pattern; startswith; classtype:not-suspicious; sid:2024195; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_04_10, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, updated_at 2020_08_05;)