ET MALWARE Win32/MALWARECAT Exfil via SMTP

Query · suricata

flow:established,to_server;
content:"Subject|3a 20|MALWARECAT"; fast_pattern;
Raw source ET MALWARE Win32/MALWARECAT Exfil via SMTP · 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/MALWARECAT Exfil via SMTP";
    flow:established,to_server;
    content:"Subject|3a 20|MALWARECAT"; fast_pattern;
    reference:md5,bc45f9e3b0a681fb7bc08dbf3c44bcf3;
    classtype:command-and-control;
    sid:2032271; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_03_22, deployment Perimeter, malware_family Win32_MALWARECAT, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_03_22;
)

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