Rule History

alert tcp $HOME_NET any -> $EXTERNAL_NET [445,139] (msg:"ET MALWARE Possible CryptXXX Ransomware Renaming Encrypted File SMB v2"; flow:to_server,established; content:"|FE|SMB"; offset:4; depth:4; content:"|11 00|"; distance:8; within:2; content:"|00|.|00|c|00|r|00|y|00|p|00|t|00|"; nocase; distance:0; fast_pattern; pcre:"/^[^A-Za-z0-9]/R"; classtype:trojan-activity; sid:2022840; rev:2; metadata:attack_target Client_Endpoint, created_at 2016_05_25, deployment Perimeter, confidence Medium, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)