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MediumSplunk security contentRod Soto +1Threat hunting

Gdrive suspicious file sharing

The following analytic identifies suspicious file-sharing activity on Google Drive, where internal users share documents with more than 50 external recipients. It leverages GSuite Drive logs, focusing on changes in…

Description

The following analytic identifies suspicious file-sharing activity on Google Drive, where internal users share documents with more than 50 external recipients. It leverages GSuite Drive logs, focusing on changes in user access and filtering for emails outside the organization's domain. This activity is significant as it may indicate compromised accounts or intentional data exfiltration. If confirmed malicious, this behavior could lead to unauthorized access to sensitive information, data leaks, and potential compliance violations.

Detection logic

Detection requirements

Platform
Identity ProviderLinuxmacOSOffice SuiteSaaSWindows

The rule states no platform. This is derived from the ATT&CK technique it maps to.

Known benign triggers

  • This is an anomaly search, you must specify your domain in the parameters so it either filters outside domains or focus on internal domains. This search may also help investigate compromise of accounts. By looking at for example source ip addresses, document titles and abnormal number of shares and shared target users.

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