alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Godlua Backdoor Domain (c .heheda .tk in TLS SNI)"; flow:established,to_server; tls.sni; content:"c.heheda.tk"; endswith; reference:url,blog.netlab.360.com/an-analysis-of-godlua-backdoor-en/; classtype:trojan-activity; sid:2027665; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Linux, attack_target Client_Endpoint, created_at 2019_07_02, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, updated_at 2020_09_17, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)