alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE TerraStealerV2 New Victim Checkin via Telegram API"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/sendMessage|3f|chat|5f|id|3d|"; http.host; bsize:16; content:"api.telegram.org"; http.request_body; content:"chat_id="; startswith; content:"|25|2A|25|2ANew|25|20User|25|20Ran|25|20the|25|20Application|25|2A|25|2A"; fast_pattern; content:"Username|25|3A|25|2A|25|2A|25|20"; distance:0; content:"PC|25|20Name|25|3A|25|2A|25|2A|25|20"; distance:0; content:"IP|25|20Address|25|3A|25|2A|25|2A|25|20"; distance:0; reference:url,go.recordedfuture.com/hubfs/reports/cta-2025-0501.pdf; reference:url,community.emergingthreats.net/t/sigs-terrastealerv2/2695; classtype:command-and-control; sid:2062074; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_05_02, deployment Perimeter, deployment SSLDecrypt, malware_family TerraStealer, confidence High, signature_severity Critical, tag c2, updated_at 2025_05_02, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)