alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Atemu RAT User-Agent Observed (CommandExecutor/1.0)"; flow:established,to_server; http.user_agent; bsize:19; content:"CommandExecutor|2f|1.0"; fast_pattern; reference:md5,a3ce0c6600781e0196aad961e92123ed; classtype:trojan-activity; sid:2068884; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2026_04_21, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, signature_severity Major, tag Atemu_RAT, updated_at 2026_04_21, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1573, mitre_technique_name Encrypted_Channel; target:src_ip;)