ET MALWARE Possible CryptXXX Ransomware Renaming Encrypted File SMB v2

Query · suricata

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";
Raw source ET MALWARE Possible CryptXXX Ransomware Renaming Encrypted File SMB v2 · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
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;
)

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