alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE DeltaStealer CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.content_type; content:"application/json"; http.host; content:".preview.app.github.dev"; endswith; http.header_names; content:!"|0d 0a|User-Agent|0d 0a|"; content:!"|0d 0a|Referer|0d 0a|"; content:"|0d 0a|ownerid|0d 0a|"; content:"|0d 0a|executable-id|0d 0a|"; http.request_body; content:"|22|report|22 3a 22|https|3a 2f 2f|gofile.io"; fast_pattern; reference:url,www.trendmicro.com/zh_hk/research/23/e/rust-based-info-stealers-abuse-github-codespaces.html; classtype:trojan-activity; sid:2045791; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_05_19, deployment Perimeter, deployment SSLDecrypt, malware_family DeltaStealer, performance_impact Low, confidence High, signature_severity Major, updated_at 2023_05_19, reviewed_at 2025_07_14; target:src_ip;)