Analytics Alerts

Browse the Cortex analytics alert reference.

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1 alert match the current filters. tactic: TA0011 ✕ technique: T1095 ✕

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  • Abnormal Recurring Communications to a Rare Domain Informational 4 variations

    Abnormal communications were seen from an internal entity to a rare external domain. This could be a case of beaconing to a C2 Server.

    Activation:
    14 Days
    Training:
    30 Days
    Test:
    N/A (single event)
    Deduplication:
    1 Day
    ATT&CK tactics: Command and Control (TA0011)
    ATT&CK techniques: Non-Application Layer Protocol (T1095)
    Required data: Palo Alto Networks Firewall traffic Logs XDR Agent Third-Party Firewalls
    Detector tags: NDR C2 Detection
    Attacker's goals: Communicate with malicious code running on your network enabling further access to the endpoint and network, performing software updates on the endpoint, or for taking inventory of infected machines.
    Investigative actions: Identify if the external domain belongs to a reputable organization or an asset used in a public cloud. Identify if the source of the traffic is malware. If the source of the traffic is a malicious file, Cortex XDR Analytics also raises a malware alert for the file on the endpoint. Malware may contact legitimate domain names, therefore check for unusual apps used or unusual ports or volumes accessed. View all related traffic generated by the suspicious process to understand the purpose. Look for other endpoints on your network that are also contacting the suspicious domain name. Examine file-system operations performed by the process that initiated the traffic and look for potential artifacts on infected endpoints.

    Variations

    Abnormal Recurring Communications to a Rare Domain With a Port Commonly Used by Attack Platforms

    Low overridden

    Abnormal communications were seen from an internal entity to a rare external domain. This could be a case of beaconing to a C2 Server. overridden

    Abnormal Recurring Communications to a Rare Domain to a Suspicious Autonomous System (AS)

    Low overridden

    Abnormal communications were seen from an internal entity to a rare external domain. This could be a case of beaconing to a C2 Server. overridden

    Abnormal Recurring Communications to a Rare Domain With an Abnormal Domain Suffix

    Informational overridden

    Abnormal communications were seen from an internal entity to a rare external domain. This could be a case of beaconing to a C2 Server. overridden

    Abnormal Recurring Communications to a Rare Domain With a Less Common Port

    Low overridden

    Abnormal communications were seen from an internal entity to a rare external domain. This could be a case of beaconing to a C2 Server. overridden