alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/TrickBot CnC Initial Checkin M2"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"_W"; content:"/5/file/"; endswith; fast_pattern; http.user_agent; content:"curl/"; startswith; http.header_names; to_lowercase; content:!"|0d 0a|accept"; content:!"|0d 0a|referer|0d 0a|"; classtype:trojan-activity; sid:2033659; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_11_09, deployment Perimeter, deprecation_reason Age, malware_family TrickBot, confidence High, signature_severity Major, updated_at 2024_05_01, reviewed_at 2024_01_03;)