External SaaS file-sharing activity

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

10 Minutes

Deduplication Period

1 Day

Required Data

  • Requires one of the following data sources:
    • Box Audit Log
      OR
    • DropBox
      OR
    • Google Workspace Audit Logs
      OR
    • Office 365 Audit

Detection Modules

Identity Threat Module

ATT&CK Tactic

Collection (TA0009)

ATT&CK Technique

Data from Cloud Storage (T1530)

Severity

Informational

Description

A user shared files from within a SaaS service to an external domain.

Attacker's Goals

An attacker may share files from a SaaS service to exfiltrate sensitive data.

Investigative actions

  • Check for signs of account compromise, such as abnormal login activity or unusual behavior.
  • Determine if the files are shared with users outside the organization and if the recipients are familiar.
  • Review the files that were shared to determine if they contain sensitive data.
  • Analyze the file types that were shared.
  • Monitor the account for any further suspicious actions.

Variations

SaaS external file sharing to an abnormal domain

Synopsis

ATT&CK Tactic

Collection (TA0009)

ATT&CK Technique

Data from Cloud Storage (T1530)

Severity

Low

Description

A user shared files to an external domain, which the organization does not typically share files with.

Attacker's Goals

An attacker may share files from a SaaS service to exfiltrate sensitive data.

Investigative actions

  • Check for signs of account compromise, such as abnormal login activity or unusual behavior.
  • Determine if the files are shared with users outside the organization and if the recipients are familiar.
  • Review the files that were shared to determine if they contain sensitive data.
  • Analyze the file types that were shared.
  • Monitor the account for any further suspicious actions.