VPN access with an abnormal operating system

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 Global Protect
      OR
    • Third-Party VPNs

Detection Modules

Identity Analytics

ATT&CK Tactic

Initial Access (TA0001)

ATT&CK Technique

Valid Accounts: Domain Accounts (T1078.002)

Severity

Informational

Description

A user accessed a VPN with an abnormal operating system.

Attacker's Goals

Use a legitimate user and connect to a VPN service to gain access to the network.

Investigative actions

  • See whether the service authentication was successful.
  • Confirm that the activity is benign (e.g. the user has really moved to a new operating system).
  • Follow actions and suspicious activities regarding the user.

Variations

VPN access with a suspicious operating system

Synopsis

ATT&CK Tactic

Initial Access (TA0001)

ATT&CK Technique

Valid Accounts: Domain Accounts (T1078.002)

Severity

Medium

Description

A user accessed a VPN with an abnormal operating system.

Attacker's Goals

Use a legitimate user and connect to a VPN service to gain access to the network.

Investigative actions

  • See whether the service authentication was successful.
  • Confirm that the activity is benign (e.g. the user has really moved to a new operating system).
  • Follow actions and suspicious activities regarding the user.


VPN access from an abnormal operating system with suspicious characteristics

Synopsis

ATT&CK Tactic

Initial Access (TA0001)

ATT&CK Technique

Valid Accounts: Domain Accounts (T1078.002)

Severity

Low

Description

A user accessed a VPN from an abnormal operating system with some more suspicious characteristics that flagged this login attempt as a suspicious login.

Attacker's Goals

Use a legitimate user and connect to a VPN service to gain access to the network.

Investigative actions

  • See whether the service authentication was successful.
  • Confirm that the activity is benign (e.g. the user has really moved to a new operating system).
  • Follow actions and suspicious activities regarding the user.