Analytics Alerts

Browse the Cortex analytics alert reference.

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1 alert match the current filters. technique: T1566 ✕

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  • Email attachment with a potentially malicious file extension Informational Email 2 variations

    The email message includes attachments with file types that are typically blocked by the email vendor as a precaution due to their suspicious nature.

    Activation:
    14 Days
    Training:
    30 Days
    Test:
    N/A (single event)
    Deduplication:
    1 Hour 30 Minutes
    ATT&CK tactics: Initial Access (TA0001) Execution (TA0002)
    ATT&CK techniques: Phishing (T1566) User Execution (T1204)
    Required data: Microsoft 365 Emails
    Attacker's goals: Trick users into clicking on malicious attachments Deploy malicious attachments through emails to compromise systems, gain unauthorized access, or facilitate cyber threats.
    Investigative actions: Check the file types and investigate the legitimacy of files intended to be sent via email. 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. Check the email address for any unusual spellings. Check the email address for any missing letters. Verify the sender's domain to confirm its legitimacy. Examine the sender's IP address and reputation. Verify whether the sender's IP address has appeared in different log sources before. Verify if the sender's IP address is identifiable.

    Variations

    Attachment(s) with a potentially malicious file extension unusual for the organization

    Informational overridden

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

    Attachment(s) with a potentially malicious file extension unusual for the recipient

    Informational overridden

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