ET MALWARE Skeleton Key Filename in SMB Traffic (Unicode)

Query · suricata

flow:to_server,established;
content:"|FF|SMB|a2|"; offset:4; depth:5;
byte_test:1,&,0x80,6,relative;
content:"|5c 00|m|00|s|00|u|00|t|00|a|00|6|00|4|00|.|00|d|00|l|00|l";
Raw source ET MALWARE Skeleton Key Filename in SMB Traffic (Unicode) · Suricata
Esc
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 -> $HOME_NET [139,445] (
    msg:"ET MALWARE Skeleton Key Filename in SMB Traffic (Unicode)";
    flow:to_server,established;
    content:"|FF|SMB|a2|"; offset:4; depth:5;
    byte_test:1,&,0x80,6,relative;
    content:"|5c 00|m|00|s|00|u|00|t|00|a|00|6|00|4|00|.|00|d|00|l|00|l";
    reference:url,www.secureworks.com/cyber-threat-intelligence/threats/skeleton-key-malware-analysis;
    classtype:trojan-activity;
    sid:2020176; rev:3;
    metadata:created_at 2015_01_13, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)

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