alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE 10FXRAT C2 Beacon (Initial)"; flow:established,to_server; content:"|31 30 46 58|"; startswith; content:"|01 00 00 00|"; distance:4; within:4; content:"|22|computerName|22 3a 22|"; content:"|22|userName|22 3a 22|"; content:"|22|hostExe|22 3a 22|"; fast_pattern; reference:url,www.lac.co.jp/lacwatch/report/20260604_004759.html; classtype:trojan-activity; sid:2072021; rev:1; metadata:attack_target Client_Endpoint, created_at 2026_09_14, deployment Perimeter, malware_family 10FXRAT, confidence High, signature_severity Major, tag c2, updated_at 2026_09_14, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)