Analytics Alerts

Browse the Cortex analytics alert reference.

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2 alerts match the current filters. tactic: TA0007 ✕

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  • An internal Cloud resource performed port scan on external networks Medium Cloud

    An internal cloud resource attempted to connect to the same destination port of multiple external IP addresses. This may be a result of the cloud resource being hijacked by an attacker. Attackers perform port scans on a specific destination port for reconnaissance purposes, to detect known vulnerable services that accept connections in the specific port, and perform targeted attacks against them.

    Activation:
    14 Days
    Training:
    30 Days
    Test:
    1 Hour
    Deduplication:
    5 Days
    ATT&CK tactics: Discovery (TA0007) Impact (TA0040)
    ATT&CK techniques: Network Service Discovery (T1046) Resource Hijacking (T1496) Cloud Service Discovery (T1526)
    Required data: XDR Agent
    Attacker's goals: Detect vulnerable services, which listen on known ports and are opened to the Internet.
    Investigative actions: Check if similar activity was performed on additional cloud resources. Check if similar activity was performed against additional ports and external ip addresses from the same cloud resource. Check which process triggered the port scanning activity and for what purpose.
  • Port Scan Informational 3 variations

    The endpoint connected, or attempted to connect, to multiple privileged ports, which are infrequently used by other endpoints (i.e. destination ports that are normally used by many endpoints will not raise this alert). Attackers perform port scans for reconnaissance purposes, to find computers or servers that accept connections on these ports, and to find vulnerable services that can be exploited. Coverage for port scans using data arriving solely from Cortex agents is incomplete.

    Activation:
    14 Days
    Training:
    30 Days
    Test:
    1 Hour
    Deduplication:
    1 Day
    ATT&CK tactics: Discovery (TA0007)
    ATT&CK techniques: Network Service Discovery (T1046)
    Required data: Palo Alto Networks Firewall traffic Logs Third-Party Firewalls
    Attacker's goals: An attacker is determining which ports are open or closed on remote endpoints in an attempt to identify the endpoint operating system, firewall configuration, and exploitable services.
    Investigative actions: New endpoints that use multiple ports can cause a false positive. Ensure that the endpoint is not new on the network, and is not hosting services such as FTP servers or domain controllers that are being contacted for the first time. Check if the activity is a SYN-ACK scan. These might result in Cortex XDR Analytics detecting the scan as coming from the wrong direction, and could mean that Cortex XDR Analytics used the wrong baseline in triggering the alert. Check for port map and/or X11 usage. These usually open multiple ports. If the protocol usage for the specific destination is sparse, Cortex XDR Analytics could raise a false alert.

    Variations

    Port scan by suspicious process

    Low overridden

    The endpoint connected, or attempted to connect, to multiple privileged ports, which are infrequently used by other endpoints (i.e. destination ports that are normally used by many endpoints will not raise this alert). Attackers perform port scans for reconnaissance purposes, to find computers or servers that accept connections on these ports, and to find vulnerable services that can be exploited. Coverage for port scans using data arriving solely from Cortex agents is incomplete. overridden

    Highly suspicious port scan

    Medium overridden

    The endpoint connected, or attempted to connect, to multiple privileged ports, which are infrequently used by other endpoints (i.e. destination ports that are normally used by many endpoints will not raise this alert). Attackers perform port scans for reconnaissance purposes, to find computers or servers that accept connections on these ports, and to find vulnerable services that can be exploited. Coverage for port scans using data arriving solely from Cortex agents is incomplete. overridden

    Suspicious port scan

    Low overridden

    The endpoint connected, or attempted to connect, to multiple privileged ports, which are infrequently used by other endpoints (i.e. destination ports that are normally used by many endpoints will not raise this alert). Attackers perform port scans for reconnaissance purposes, to find computers or servers that accept connections on these ports, and to find vulnerable services that can be exploited. Coverage for port scans using data arriving solely from Cortex agents is incomplete. overridden