alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE NordDragonScan CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.user_agent; bsize:9; content:"RTYUghjNM"; fast_pattern; http.header_names; content:"|0d 0a|Mac|0d 0a|"; reference:url,www.fortinet.com/blog/threat-research/norddragonscan-quiet-data-harvester-on-windows; classtype:trojan-activity; sid:2063342; 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 TLSDecrypt, created_at 2025_07_08, deployment Perimeter, malware_family NordDragonScan, performance_impact Low, confidence High, signature_severity Major, updated_at 2025_07_08, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel; target:src_ip;)