ET MALWARE Executioner Ransomware Reporting Infection via SMTP

Query · suricata

flow:established,to_server;
dsize:<40;
content:"DECRYPT CODE|20 3a 20 20 20 20 20 20 20|"; fast_pattern; depth:21;
Raw source ET MALWARE Executioner Ransomware Reporting Infection via SMTP · 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 [25,2525,587] (
    msg:"ET MALWARE Executioner Ransomware Reporting Infection via SMTP";
    flow:established,to_server;
    dsize:<40;
    content:"DECRYPT CODE|20 3a 20 20 20 20 20 20 20|"; fast_pattern; depth:21;
    reference:md5,eec4f84d12139add6d6ebf3b8c72fff7;
    classtype:trojan-activity;
    sid:2024351; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_06_06, deployment Perimeter, malware_family Ransomware, malware_family Executioner, confidence Medium, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;
)

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