Analytics Alerts

Browse the Cortex analytics alert reference.

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1 alert match the current filters. tactic: TA0005 ✕ technique: T1684 ✕

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  • Unusual hostname for the sending mail server in the email headers Informational Email

    The detected mail server hostname had not been observed in the organization's emails in the past 30 days.

    Activation:
    14 Days
    Training:
    30 Days
    Test:
    N/A (single event)
    Deduplication:
    1 Day
    ATT&CK tactics: Stealth (TA0005)
    ATT&CK techniques: Social Engineering: Impersonation (T1684.001)
    Required data: Microsoft 365 Emails
    Detector tags: Spoofing
    Attacker's goals: Disguise the email's origin by spoofing the received header to appear as a trusted sender, impersonating a trusted source, aims to mislead recipients into disclosing private data or performing unsafe acts.
    Investigative actions: Review the email's received headers, to trace its path and spot spoofing signs. Examine the sender's IP address and domain reputation. Closely inspect the email content for malicious links, attachments, or requests for sensitive information. Monitor further actions taken, such as file downloads or access to potentially malicious links.