ET MALWARE S400 RAT Client Checkin

Query · suricata

flow:established,to_server;
stream_size:server,<,5;
dsize:5;
content:"|33 00|FCC"; fast_pattern;
Raw source ET MALWARE S400 RAT Client Checkin · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE S400 RAT Client Checkin";
    flow:established,to_server;
    stream_size:server,<,5;
    dsize:5;
    content:"|33 00|FCC"; fast_pattern;
    reference:md5,41ca8d5782ef5ac7a371b44f51dc48d9;
    classtype:command-and-control;
    sid:2034063; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_09_30, deployment Perimeter, malware_family S400, confidence High, signature_severity Major, tag RAT, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_30;
)

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