Massive upload to SaaS service

Synopsis

Field	Value
Activation Period	14 Days
Training Period	30 Days
Test Period	3 Hours
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, SaaS Threat Detection
Detector Tags	Data Detection & Response
ATT&CK Tactic	Exfiltration (TA0010), Collection (TA0009)
ATT&CK Technique	Exfiltration Over Web Service (T1567), Exfiltration Over Web Service: Exfiltration to Cloud Storage (T1567.002), Data Staged: Remote Data Staging (T1074.002)
Severity	Informational

Description

A user uploaded a large amount of data to an organizational cloud storage. This behavior may indicate that the data is being exfiltrated or staged.

Attacker's Goals

An attacker may upload files to a SaaS service to stage and exfiltrate data from the organization.

Investigative actions

• Check for signs of account compromise, such as abnormal login activity or unusual behavior.
• Review the files that were uploaded to determine if they contain sensitive data.
• Verify if the user account that uploaded the files is authorized to access them.
• Analyze the file types that were uploaded.
• Monitor the account for any further suspicious actions.

Variations

Massive upload to SaaS service by suspicious user

Synopsis

Field	Value
ATT&CK Tactic	Exfiltration (TA0010), Collection (TA0009)
ATT&CK Technique	Exfiltration Over Web Service (T1567), Exfiltration Over Web Service: Exfiltration to Cloud Storage (T1567.002), Data Staged: Remote Data Staging (T1074.002)
Severity	Low

Description

A suspicious user uploaded a large amount of data to an organizational cloud storage. This behavior may indicate that the data is being exfiltrated or staged.

Attacker's Goals

An attacker may upload files to a SaaS service to stage and exfiltrate data from the organization.

Investigative actions

• Check for signs of account compromise, such as abnormal login activity or unusual behavior.
• Review the files that were uploaded to determine if they contain sensitive data.
• Verify if the user account that uploaded the files is authorized to access them.
• Analyze the file types that were uploaded.
• Monitor the account for any further suspicious actions.