ET MALWARE Suspected CHAOS CnC Inbound (keylogger start)

Query · suricata

flow:established,to_client;
dsize:21;
content:"a2V5bG9nZ2VyX3N0YXJ0|0a|";
Raw source ET MALWARE Suspected CHAOS CnC Inbound (keylogger start) · 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 $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET MALWARE Suspected CHAOS CnC Inbound (keylogger start)";
    flow:established,to_client;
    dsize:21;
    content:"a2V5bG9nZ2VyX3N0YXJ0|0a|";
    reference:url,github.com/tiagorlampert/CHAOS;
    classtype:command-and-control;
    sid:2029798; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2020_04_02, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_02;
)

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