Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed MAZE Ransomware CnC Domain (checksoffice .me in TLS SNI)"; flow:established,to_server; tls.sni; content:"checksoffice.me"; bsize:15; reference:url,www.fireeye.com/blog/threat-research/2020/05/tactics-techniques-procedures-associated-with-maze-ransomware-incidents.html; classtype:command-and-control; sid:2030209; rev:1; metadata:attack_target Client_Endpoint, created_at 2020_05_22, deployment Perimeter, malware_family Maze_Ransomware, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_05_22, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)