ET MALWARE Locky Ransomware Renaming File via SMB

alert tcp $HOME_NET any -> $EXTERNAL_NET [445,139] (
    msg:"ET MALWARE Locky Ransomware Renaming File via SMB";
    flow:to_server,established;
    content:"|FE|SMB"; offset:4; depth:4;
    content:"|11 00|"; distance:8; within:2;
    content:"|00|.|00|z|00|e|00|p|00|t|00|o|00|"; nocase; distance:0; fast_pattern;
    classtype:trojan-activity;
    sid:2023147; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_09_01, deployment Perimeter, malware_family Ransomware, confidence High, signature_severity Major, tag Ransomware, updated_at 2019_07_26, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;
)