Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Vidar Stealer Domain (fua .4t .com) in TLS SNI"; flow:established,to_server; tls.sni; bsize:10; content:"fua.4t.com"; fast_pattern; reference:url,www.gdatasoftware.com/blog/2025/04/38169-vidar-stealer; classtype:domain-c2; sid:2061455; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2025_04_11, deployment Perimeter, malware_family Vidar, performance_impact Low, confidence High, signature_severity Major, updated_at 2025_04_11, mitre_tactic_id TA0037, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)