Analytics Alerts

Browse the Cortex analytics alert reference.

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1 alert match the current filters. tactic: TA0005 ✕

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  • Email attachment(s) with potentially malicious MIME type Informational Email 2 variations

    The email message contains an attachment(s) with a potentially malicious MIME type.

    Activation:
    14 Days
    Training:
    30 Days
    Test:
    N/A (single event)
    Deduplication:
    1 Day
    ATT&CK tactics: Stealth (TA0005) Execution (TA0002)
    ATT&CK techniques: Masquerading: Masquerade File Type (T1036.008) User Execution (T1204)
    Required data: Microsoft 365 Emails
    Attacker's goals: Bypass security filters and deliver malicious content to users Deploy malicious attachments through emails to compromise systems, gain unauthorized access, or facilitate cyber threats.
    Investigative actions: Carefully analyze attachments for any indications of suspicious or malicious behavior. Scrutinize the attachments for any suspicious indications. Confirm whether the attachments were successfully delivered to the recipient's mailbox. If the attachments were delivered successfully, verify whether the recipient downloaded them.

    Variations

    Attachment(s) with potentially malicious MIME type unusual for the organization

    Informational overridden

    At least one attachment with a potentially malicious file mime-type was received in an email for the first time within the organization in the past 30 days. overridden

    Attachment(s) with a potentially malicious MIME type that is unusual for the recipient

    Informational overridden

    At least one attachment with a potentially malicious file mime-type was received in an email for the first time for the recipient in the past 30 days. overridden