Analytics Alerts

Browse the Cortex analytics alert reference.

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1 alert match the current filters. technique: T1204 ✕

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  • External email with a single internal recipient hidden in BCC Informational Email 1 variation

    External email with mailbox owner hidden in BCC as the only internal recipient.

    Activation:
    14 Days
    Training:
    30 Days
    Test:
    N/A (single event)
    Deduplication:
    1 Hour 30 Minutes
    ATT&CK tactics: Execution (TA0002) Credential Access (TA0006)
    ATT&CK techniques: User Execution (T1204) Brute Force: Password Cracking (T1110.002)
    Required data: Microsoft 365 Emails
    Attacker's goals: BCC enables sending the same email to multiple hidden recipients without revealing them to each other.
    Investigative actions: Review the headers and content for patterns or anomalies. Assess the email's context and attack techniques to determine the potential risk. Investigate if similar patterns have occurred recently across the organization.

    Variations

    External email with only a hidden internal BCC recipient

    Informational overridden

    External email with no visible recipients, mailbox owner is hidden in BCC. overridden