Analytics Alerts

Browse the Cortex analytics alert reference.

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1 alert match the current filters. tactic: TA0001 ✕ technique: T1566 ✕

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  • Possible phishing attack via Microsoft Teams Low Identity Threat Module 3 variations

    An external tenant is possibly attempting a phishing attack via Microsoft Teams.

    Activation:
    14 Days
    Training:
    30 Days
    Test:
    5 Hours
    Deduplication:
    1 Day
    ATT&CK tactics: Initial Access (TA0001)
    ATT&CK techniques: Phishing (T1566)
    Required data: AzureAD Audit Log Microsoft Graph Logs Office 365 Audit Okta Palo Alto Networks Global Protect Third-Party VPNs XDR Agent XDR Agent with eXtended Threat Hunting (XTH)
    Detector tags: Microsoft Teams
    Attacker's goals: Attackers may leverage Microsoft Teams to conduct phishing attacks by exploiting trusted communication channels with users inside the organization.
    Investigative actions: Verify the suspicious sign-in activity to validate the legitimacy of the suspicious login. Review Teams chat logs and meeting invites for interactions with external tenants, focusing on unusual file sharing or unsolicited links. Hunt for known phishing indicators (suspicious domains, URL patterns, or IPs) in the Teams messages and linked content. Evaluate the external tenant reputation. Check for anomalous MS Teams actions like suspicious application installation, message extraction, policy changes or internal spear phishing attempts linked to the user post-login. Follow further actions done by the account.

    Variations

    Potential phishing attack with post compromise stages had been detected

    High overridden

    Suspicious Microsoft Teams phishing activity detected across multiple indicators, the activities have strong indications of a malicious login and post compromise actions. overridden

    Potential phishing attack via Microsoft Teams has been detected

    Medium overridden

    Suspicious Microsoft Teams phishing activity detected across multiple indicators, the activities have strong indications of a malicious login. overridden

    Potential phishing attack with post compromise activities in Microsoft Teams has been detected

    Medium overridden

    Suspicious Microsoft Teams phishing activity detected across multiple indicators. overridden