alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO OneNote Notebook Downloaded via Powershell"; flow:to_server,established; http.method; content:"GET"; http.uri; content:".one"; endswith; http.user_agent; content:"WindowsPowerShell/"; fast_pattern; http.header_names; content:!"Referer"; reference:url,twitter.com/executemalware/status/1613636484778663936; classtype:misc-activity; sid:2043296; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_01_13, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_01_16, reviewed_at 2025_10_24;)