ET MALWARE Possible Dragonfly APT Activity - SMB credential harvesting

Query · suricata

flow:established,to_server;
content:"|FF|SMB|75 00 00 00 00|"; offset:4; depth:9;
content:"|08 00 01 00|"; distance:3;
content:"|00 5c 5c|"; distance:2; within:3;
content:"|5c|AME_ICON.PNG"; distance:7; fast_pattern;
Raw source ET MALWARE Possible Dragonfly APT Activity - SMB credential harvesting · 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 any any -> any 445 (
    msg:"ET MALWARE Possible Dragonfly APT Activity - SMB credential harvesting";
    flow:established,to_server;
    content:"|FF|SMB|75 00 00 00 00|"; offset:4; depth:9;
    content:"|08 00 01 00|"; distance:3;
    content:"|00 5c 5c|"; distance:2; within:3;
    content:"|5c|AME_ICON.PNG"; distance:7; fast_pattern;
    reference:url,www.us-cert.gov/ncas/alerts/TA17-293A;
    reference:url,www.us-cert.gov/sites/default/files/publications/MIFR-10128883_TLP_WHITE.pdf;
    classtype:targeted-activity;
    sid:2024898; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2017_10_23, deployment Perimeter, confidence Medium, signature_severity Major, updated_at 2019_07_26;
)

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