This threat involves malicious actors leveraging Google Apps Script to conduct evasive phishing attacks. Google Apps Script is a cloud-based scripting platform integrated with Google Workspace applications such as Gmail, Google Sheets, and Google Docs. Attackers exploit this trusted environment to craft phishing campaigns that bypass traditional security filters. By embedding malicious scripts within Google Apps Script projects, threat actors can send phishing emails or create deceptive web content that appears legitimate because it originates from a trusted Google domain. This technique complicates detection since many security solutions whitelist Google services, allowing malicious payloads to evade email gateways and endpoint protections. The phishing attacks typically aim to harvest credentials, deliver malware, or perform account takeovers. The use of Google Apps Script also enables dynamic content generation and interaction with Google APIs, increasing the sophistication and evasiveness of these campaigns. Although no specific affected versions or exploits in the wild are documented, the medium severity rating indicates a credible risk requiring attention. The minimal discussion and low Reddit score suggest this is an emerging or underreported threat vector.

European organizations relying heavily on Google Workspace are at risk of targeted phishing attacks that exploit the trust in Google domains. Successful phishing can lead to credential theft, unauthorized access to sensitive corporate data, and potential lateral movement within networks. Given the widespread adoption of Google Workspace across Europe, especially in sectors like finance, education, and government, the impact could be significant. Compromised credentials can facilitate data breaches, regulatory non-compliance (e.g., GDPR violations), and financial fraud. The evasive nature of these attacks may reduce the effectiveness of existing email security solutions, increasing the likelihood of successful intrusions. Additionally, organizations with limited security awareness training or insufficient multi-factor authentication (MFA) deployment are more vulnerable. The threat could also undermine user trust in cloud services, complicating digital transformation efforts.

To mitigate this threat, European organizations should implement advanced email filtering solutions that analyze email content beyond sender reputation, including script behavior and embedded URLs, even if originating from Google domains. Deploying endpoint detection and response (EDR) tools capable of identifying suspicious script execution is critical. Organizations must enforce strict MFA policies across all Google Workspace accounts to reduce the risk of credential compromise. Security awareness training should be updated to educate users about the specific risks of phishing via trusted cloud services and how to identify suspicious Google Apps Script activity. Administrators should regularly audit Google Workspace app scripts and third-party add-ons for unauthorized or suspicious scripts. Implementing conditional access policies that restrict access based on device compliance and location can further reduce risk. Finally, organizations should monitor for anomalous login patterns and unusual API usage within Google Workspace to detect potential compromises early.