ET MALWARE Remcos 3.x Unencrypted Server Response

Query · suricata

flow:established,to_client;
content:"|24 04 ff 00|"; startswith;
content:"|01 00 00 00 30 7c 1e 1e 1f 7c|"; distance:4; within:10; fast_pattern;
threshold:type limit, track by_src, count 1, seconds 120;
Raw source ET MALWARE Remcos 3.x Unencrypted Server Response · 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 any -> $HOME_NET any (
    msg:"ET MALWARE Remcos 3.x Unencrypted Server Response";
    flow:established,to_client;
    content:"|24 04 ff 00|"; startswith;
    content:"|01 00 00 00 30 7c 1e 1e 1f 7c|"; distance:4; within:10; fast_pattern;
    threshold:type limit, track by_src, count 1, seconds 120;
    reference:md5,d27f70216d11b769c937a961fc1b1c81;
    classtype:command-and-control;
    sid:2032777; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_04_16, deployment Perimeter, malware_family Remcos, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_04_16;
)

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