Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed CobaltStrike Loader Domain (cybersecyrity .com in TLS SNI)"; flow:established,to_server; tls.sni; content:"cybersecyrity.com"; bsize:17; fast_pattern; reference:md5,611d4c566575d5657661766e27292d28; classtype:domain-c2; sid:2033060; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_06_01, deployment Perimeter, malware_family Cobalt_Strike, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_06_01, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)