Suspicious domain suffix

Cortex XDR Analytics Alert Reference by Alert name

Product
Cortex XDR
Last date published
2024-06-04
Category
Analytics Alert Reference
Order
Alert name

Synopsis

Activation Period

14 Days

Training Period

30 Days

Test Period

N/A (single event)

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

Initial Access (TA0001)

ATT&CK Technique

Phishing (T1566)

Severity

Low

Description

Communication with a domain that has a suspicious suffix.

Attacker's Goals

Command & Control communication to infected endpoints in the network, through which they can perform software updates, take inventory of infected machines, or spread further in the organization.

Investigative actions

  • Verify that the external domain or its IP address belongs to a reputable organization.
  • Verify that the source of the traffic is not a malware. If the source of the traffic is a malicious file, Cortex XDR Analytics might also raise a malware alert for the file on the endpoint.
  • View all related traffic generated by the suspicious process and understand its purpose.
  • Look for other endpoints in your network that also contact the suspicious domain or its IP address.
  • Examine file-system operations performed by the process to look for potential artifacts on infected endpoints.

Variations

Suspicious domain suffix with a rare user agent

Synopsis

ATT&CK Tactic

Initial Access (TA0001)

ATT&CK Technique

Phishing (T1566)

Severity

Low

Description

Communication with a domain that has a suspicious suffix.

Attacker's Goals

Command & Control communication to infected endpoints in the network, through which they can perform software updates, take inventory of infected machines, or spread further in the organization.

Investigative actions

  • Verify that the external domain or its IP address belongs to a reputable organization.
  • Verify that the source of the traffic is not a malware. If the source of the traffic is a malicious file, Cortex XDR Analytics might also raise a malware alert for the file on the endpoint.
  • View all related traffic generated by the suspicious process and understand its purpose.
  • Look for other endpoints in your network that also contact the suspicious domain or its IP address.
  • Examine file-system operations performed by the process to look for potential artifacts on infected endpoints.