alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Betruger Domain (504ec1c95 .host .njalla .net in TLS SNI)"; flow:established,to_server; tls.sni; bsize:25; content:"504ec1c95.host.njalla.net"; fast_pattern; reference:url,thedfirreport.com/2025/09/08/blurring-the-lines-intrusion-shows-connection-with-three-major-ransomware-gangs/; classtype:trojan-activity; sid:2064494; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2025_09_08, deployment Perimeter, malware_family Betruger, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_09_08, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)