Massive file downloads from SaaS service

Cortex XDR Analytics Alert Reference by Alert name

Product

Cortex XDR

Last date published

2024-09-24

Synopsis

Activation Period	14 Days
Training Period	30 Days
Test Period	1 Hour
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
Detector Tags
ATT&CK Tactic	Collection (TA0009)
ATT&CK Technique	Data from Cloud Storage (T1530)
Severity	Informational

Description

A user downloaded a large volume of files from an organizational SaaS service, either exceeding the normal file count or size for the user's typical behavior.

Attacker's Goals

An attacker may download 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.
Review the files that were downloaded to determine if they contain sensitive data.
Verify if the user account that downloaded the files is authorized to access them.
Analyze the file types that were downloaded.
Monitor the account for any further suspicious actions.

Variations

Suspicious SaaS service file downloads

Synopsis

ATT&CK Tactic	Collection (TA0009)
ATT&CK Technique	Data from Cloud Storage (T1530)
Severity	Low

Description

A user downloaded a large volume of files from an organizational SaaS service, either exceeding the normal file count or size for the user's typical behavior. The user connected from an unknown IP and displayed suspicious characteristics.

Attacker's Goals

An attacker may download 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.
Review the files that were downloaded to determine if they contain sensitive data.
Verify if the user account that downloaded the files is authorized to access them.
Analyze the file types that were downloaded.
Monitor the account for any further suspicious actions.

Massive file downloads from SaaS service by terminated user

Synopsis

ATT&CK Tactic	Collection (TA0009)
ATT&CK Technique	Data from Cloud Storage (T1530)
Severity	Low

Description

A user downloaded a large volume of files from an organizational SaaS service, either exceeding the normal file count or size for the user's typical behavior.

Attacker's Goals

An attacker may download 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.
Review the files that were downloaded to determine if they contain sensitive data.
Verify if the user account that downloaded the files is authorized to access them.
Analyze the file types that were downloaded.
Monitor the account for any further suspicious actions.