ET MALWARE Win32/CrimsonRAT Activity (Inbound)

Query · suricata

flow:established,to_client;
dsize:<20;
content:"|00 00 00 00|"; offset:1; depth:4;
content:"|79 32|"; distance:2; within:2; fast_pattern;
content:"|3d|"; distance:2; within:3;
target:dest_ip;
Raw source ET MALWARE Win32/CrimsonRAT Activity (Inbound) · 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-pkt $EXTERNAL_NET 1024: -> $HOME_NET any (
    msg:"ET MALWARE Win32/CrimsonRAT Activity (Inbound)";
    flow:established,to_client;
    dsize:<20;
    content:"|00 00 00 00|"; offset:1; depth:4;
    content:"|79 32|"; distance:2; within:2; fast_pattern;
    content:"|3d|"; distance:2; within:3;
    reference:md5,e55e497ceadd037254e847187b6996da;
    reference:url,twitter.com/RedDrip7/status/1622908094606094338;
    classtype:trojan-activity;
    sid:2044147; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2023_02_08, deployment Perimeter, malware_family CrimsonRAT, performance_impact Moderate, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_02_08;
    target:dest_ip;
)

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