ET MALWARE Win32/HackTool.Agent.CS SMTP activity

Query · suricata

flow:established,to_server;
content:"|7c 7c 7c|hhjjkk"; fast_pattern;
threshold:type limit, count 5, seconds 300, track by_src;
Raw source ET MALWARE Win32/HackTool.Agent.CS SMTP activity · 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 smtp $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/HackTool.Agent.CS SMTP activity";
    flow:established,to_server;
    content:"|7c 7c 7c|hhjjkk"; fast_pattern;
    threshold:type limit, count 5, seconds 300, track by_src;
    classtype:trojan-activity;
    sid:2037755; rev:1;
    metadata:attack_target SMTP_Server, created_at 2022_07_13, deployment Perimeter, malware_family Win32_HackTool_Agent_CS, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_07_13;
)

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