alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Myth Stealer Data Exfiltration Attempt M1"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/api/send"; http.header; content:"key|3a 20|myth-"; fast_pattern; http.request_body; content:" KPtxt.snekot"; reference:url,www.trellix.com/blogs/research/demystifying-myth-stealer-a-rust-based-infostealer/; classtype:trojan-activity; sid:2063264; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_and_Server, tls_state plaintext, created_at 2025_07_01, deployment Perimeter, malware_family MythStealer, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_07_01, mitre_tactic_id TA0037, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel; target:src_ip;)