alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE TonRAT CnC Activity (Fetch Powershell)"; flow:established,to_server; flowbits:set, ET.TonRAT; flowbits:noalert; http.method; content:"GET"; http.uri; bsize:1; content:"/"; http.user_agent; content:"Mozilla"; startswith; content:"Windows"; distance:0; content:"WindowsPowerShell/5.1.19041.1237"; fast_pattern; http.header_names; content:!"|0d 0a|referer|0d 0a|"; nocase; reference:url,blog.itochuci.co.jp/entry/2026/06/11/111500; classtype:command-and-control; sid:2071870; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, affected_product Windows_8, affected_product Windows_10, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_08_31, deployment Perimeter, malware_family TonRAT, confidence High, signature_severity Major, tag c2, tag Blockchain, updated_at 2026_09_01, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)