alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Amatera Stealer CnC Checkin Attempt M2"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/enc_ujs/"; fast_pattern; startswith; pcre:"/^[a-f0-9]{8}-(?:[a-f0-9]{4}-){3}[a-f0-9]{12}$/R"; http.header_names; content:!"|0d 0a|user-agent|0d 0a|"; nocase; content:!"|0d 0a|referer|0d 0a|"; nocase; reference:md5,d2ead81bf0cf01741abf09a49bc5e8a0; classtype:trojan-activity; sid:2063371; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_10, attack_target Client_and_Server, tls_state TLSDecrypt, created_at 2025_07_09, deployment Perimeter, malware_family Amatera, performance_impact Low, confidence High, signature_severity Major, updated_at 2025_07_09, mitre_tactic_id TA0037, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel; target:src_ip;)