ET MALWARE MSIL/MosaiqueRAT CnC Checkin

Query · suricata

flow:established,to_server;
dsize:<400;
content:"|e1 00 00 00|"; startswith;
content:"|00 00 00|Windows|20|"; fast_pattern; distance:0;
content:"|00 00 00|Client|20|";
isdataat:!4,relative;
Raw source ET MALWARE MSIL/MosaiqueRAT CnC 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 MSIL/MosaiqueRAT CnC Checkin";
    flow:established,to_server;
    dsize:<400;
    content:"|e1 00 00 00|"; startswith;
    content:"|00 00 00|Windows|20|"; fast_pattern; distance:0;
    content:"|00 00 00|Client|20|";
    isdataat:!4,relative;
    reference:url,github.com/thdal/MosaiqueRAT;
    classtype:trojan-activity;
    sid:2032807; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_04_23, deployment Perimeter, malware_family MSIL_MosaiqueRAT, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_04_23;
)

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