alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE TA399/SideWinder Stage 2 VBS Downloader Reporting Successful Infection"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/plugins/"; depth:9; content:"/true/true/done"; fast_pattern; endswith; http.user_agent; content:"WinHttp.WinHttpRequest."; http.header_names; content:"Referer"; content:!"Cache"; reference:md5,dfad7d4a7ecb2eed6d69abfbfb5f94c9; reference:url,medium.com/@Sebdraven/apt-sidewinder-changes-theirs-ttps-to-install-their-backdoor-f92604a2739; classtype:trojan-activity; sid:2026545; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_10_24, deployment Perimeter, malware_family Sidewinder, performance_impact Low, confidence High, signature_severity Major, tag VBS, tag TA399, updated_at 2022_03_24;)