ET MALWARE Win32/DarkCloud Exfil Over SMTP (Subject)

Query · suricata

flow:established,to_server;
content:"Subject|3a 20|DarkCloud|20|Credentials|3a 3a 3a|"; fast_pattern;
Raw source ET MALWARE Win32/DarkCloud Exfil Over SMTP (Subject) · 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/DarkCloud Exfil Over SMTP (Subject)";
    flow:established,to_server;
    content:"Subject|3a 20|DarkCloud|20|Credentials|3a 3a 3a|"; fast_pattern;
    reference:url,twitter.com/James_inthe_box/status/1572676263462174721;
    reference:md5,a498f17c44a6762c239d21cc12afec19;
    classtype:trojan-activity;
    sid:2043218; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_01_05, deployment Perimeter, malware_family Win32_DarkCloud, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_01_05;
)

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