Analytics Alerts

Browse the Cortex analytics alert reference.

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1 alert match the current filters. technique: T1204 ✕

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  • Email attachment with multiple extensions Informational Email 2 variations

    The email includes an attachment(s) with two extensions. The first one being an executable extension. This may indicate an attempt at masquerading the true file type through the misuse of multiple extensions in the attachment name.

    Activation:
    14 Days
    Training:
    30 Days
    Test:
    N/A (single event)
    Deduplication:
    1 Hour 30 Minutes
    ATT&CK tactics: Execution (TA0002) Stealth (TA0005)
    ATT&CK techniques: User Execution: Malicious File (T1204.002) Masquerading: Double File Extension (T1036.007)
    Required data: Microsoft 365 Emails
    Attacker's goals: Trick users into interacting with malicious attachments that seem legitimate. Deploy malicious attachments through emails to compromise systems or gain unauthorized access.
    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 or missing letters. Verify the sender's address to confirm its legitimacy. Check for previous emails from the sender's address.

    Variations

    Email executable attachment with multiple extensions

    Low overridden

    This email includes attachment(s) with multiple extensions, where the last extension is an executable extension. This could be a potential attempt to trick the user into executing such file(s). overridden

    Email executable attachment with multiple executable extensions

    Low overridden

    This email includes attachment(s) with multiple executable extensions that are different. This could be a potential attempt to trick the user into executing such file(s). overridden