(YARA) YARA_SMTP_Exfiltration

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rule Detect_SMTP_Exfiltration
{
    meta:
        description = "Detects potential SMTP exfiltration scripts"
        author = "Unprotect"
        date = "2025-01-09"
        reference = "Example based on SMTP exfiltration code"

    strings:
        $smtp_client = "SmtpClient" nocase
        $mail_message = "MailMessage" nocase
        $email_subject = "Exfiltrated Data" nocase
        $attachment = "Attachment" nocase
        $smtp_server = "smtp.gmail.com" nocase
        $email_address = /[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,}/ nocase
        $hardcoded_password = /"[a-z0-9!@#$%^&*()_+={}\[\]:;'<>,.?\/-]{6,}"/ nocase

    condition:
        $smtp_client and $mail_message and $email_subject and $attachment and $smtp_server and $email_address and $hardcoded_password
}

Associated Techniques