Analytics Alerts

Browse the Cortex analytics alert reference.

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1 alert match the current filters.

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  • Suspicious SPF Result Informational Email 2 variations

    The email has a suspicious SPF result of fail, soft fail, or policy, which may indicate a potential domain misconfiguration or spoofing.

    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: Impersonate internal users or familiar individuals. Trick users into clicking on malicious links or attachments.
    Investigative actions: 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 the domain's connection to the IP address and investigate the reason SPF didn't pass. Verify whether the sender's IP address has appeared in different log sources before. Verify if the sender's IP address is identifiable. If the message contains attachments or links, scrutinize them for any suspicious indications. Monitor further actions taken, such as file downloads or access to potentially malicious links.

    Variations

    Internal domain SPF deviation

    Informational overridden

    An email was sent from an internal root domain that has historically passed SPF checks, but returned a suspicious SPF result of fail, soft fail, or policy for the first time in the past 30 days. This deviation may indicate an attempt to spoof or impersonate a trusted internal sender, a tactic commonly associated with BEC and internal phishing. Such a sudden SPF outcome from a typically trusted domain warrants further investigation. overridden

    Known domain SPF deviation

    Informational overridden

    An email was sent from a domain that has historically passed SPF checks, but returned a suspicious SPF result of fail, soft fail, or policy for the first time in the past 30 days. This deviation may indicate an attempt to spoof or impersonate a legitimate external sender. Such a sudden SPF outcome from a previously trusted external domain warrants further investigation. overridden