Large Upload (Generic)

Cortex XDR Analytics Alert Reference by Alert name

Product
Cortex XDR
Last date published
2024-06-18
Category
Analytics Alert Reference
Order
Alert name

Synopsis

Activation Period

14 Days

Training Period

30 Days

Test Period

1 Day

Deduplication Period

1 Day

Required Data

  • Requires one of the following data sources:
    • Palo Alto Networks Platform Logs
      OR
    • XDR Agent

Detection Modules

ATT&CK Tactic

Exfiltration (TA0010)

ATT&CK Technique

Exfiltration Over Alternative Protocol (T1048)

Severity

Low

Description

The endpoint transferred large amounts of data to an external site using a different protocol from HTTP/s, FTP, or SMTP. (A specific detector is used for each of those protocols.)
Cortex XDR Analytics assumes that data transfers out of your network are ordinarily performed using one of those three services, so it expects that data transfers over all other ports to be low.
For the same reason, Cortex XDR Analytics also assumes endpoint traffic towards a specific destination should be about the same over long periods of time.
An attacker may be exfiltrating data directly to the internet.

Attacker's Goals

Transfer data he has stolen from your network to a location that is convenient and useful to him.

Investigative actions

  • Check if the traffic is related to SSH activity, it can trigger this alert. It is possible that someone on your network is legitimately engaged in SSH activity.
  • Check if the traffic is to/from a misconfigured network.
  • Check if the traffic is to a new external service or server that has recently been adopted for use by an organization in your enterprise.
  • Identify the process/user performing the data transfer to determine if the transfer is sanctioned.

Variations

Large Upload (Generic)

Synopsis

ATT&CK Tactic

Exfiltration (TA0010)

ATT&CK Technique

Exfiltration Over Alternative Protocol (T1048)

Severity

Informational

Description

The endpoint transferred large amounts of data to an external site using a different protocol from HTTP/s, FTP, or SMTP. (A specific detector is used for each of those protocols.)
Cortex XDR Analytics assumes that data transfers out of your network are ordinarily performed using one of those three services, so it expects that data transfers over all other ports to be low.
For the same reason, Cortex XDR Analytics also assumes endpoint traffic towards a specific destination should be about the same over long periods of time.
An attacker may be exfiltrating data directly to the internet.

Attacker's Goals

Transfer data he has stolen from your network to a location that is convenient and useful to him.

Investigative actions

  • Check if the traffic is related to SSH activity, it can trigger this alert. It is possible that someone on your network is legitimately engaged in SSH activity.
  • Check if the traffic is to/from a misconfigured network.
  • Check if the traffic is to a new external service or server that has recently been adopted for use by an organization in your enterprise.
  • Identify the process/user performing the data transfer to determine if the transfer is sanctioned.