ET MALWARE Win32/CrimsonRAT Activity (Outbound)

Query · suricata

flow:established,to_server;
dsize:100<>150;
content:"|00 00 00 00|"; offset:1; depth:4;
content:"|79 32|"; distance:2; within:2;
content:"|3d|"; distance:2; within:3;
content:"|7c 7c|"; distance:0;
content:"|3e|"; distance:1; within:1;
content:"|7c 7c 43 3a 5c 55 73 65 72 73 5c|"; distance:12; within:11; fast_pattern;
target:src_ip;
Raw source ET MALWARE Win32/CrimsonRAT Activity (Outbound) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET 1024: (
    msg:"ET MALWARE Win32/CrimsonRAT Activity (Outbound)";
    flow:established,to_server;
    dsize:100<>150;
    content:"|00 00 00 00|"; offset:1; depth:4;
    content:"|79 32|"; distance:2; within:2;
    content:"|3d|"; distance:2; within:3;
    content:"|7c 7c|"; distance:0;
    content:"|3e|"; distance:1; within:1;
    content:"|7c 7c 43 3a 5c 55 73 65 72 73 5c|"; distance:12; within:11; fast_pattern;
    reference:md5,e55e497ceadd037254e847187b6996da;
    reference:url,twitter.com/RedDrip7/status/1622908094606094338;
    classtype:trojan-activity;
    sid:2044148; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2023_02_08, deployment Perimeter, malware_family CrimsonRAT, performance_impact Significant, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_02_08;
    target:src_ip;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.