alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE TA399/SideWinder Related Malware Activity M2 (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/2/0/1/"; offset:12; depth:9; content:"/files-"; distance:51; within:7; content:"/hta"; fast_pattern; distance:8; within:4; endswith; reference:md5,6c8ac90f16acfc0ca871f74d47ac3856; classtype:trojan-activity; sid:2039548; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_10_24, deployment Perimeter, deployment SSLDecrypt, malware_family Sidewinder, confidence High, signature_severity Major, tag TA399, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_10_24;)