Legacy PowerShell scripts have long been relied upon for various tasks at FIs, including transaction monitoring. However, as technology evolves, it becomes critical to address the potential risks associated with these scripts. In this article, we explore a specific real-world example where a PowerShell script processing error within Microsoft Excel led to a breach and loss of potential revenue. We emphasize the importance of transitioning away from such scripts and adopting modern technologies to mitigate risks, enhance security, and safeguard revenue.
- Breach Incidents: In several notable incidents at an FI, PowerShell scripts designed to process sensitive data within Microsoft Excel introduced zero-day malware to an internal networks’ machines (link below). The error remained undetected for an extended period, resulting in compromised group accounts and access rights. Through a mix of legacy tools such as Excel and unhygienic computing practices, the banks in question were exposed to severe reputational loss and significant downtime.
- Transitioning to Modern Technologies: To mitigate risks and safeguard revenue, financial institutions are increasingly adopting modern technologies and approaches that offer improved data processing and automation capabilities. Instead of relying solely on PowerShell scripts, consider the following alternatives:
- Database Technologies: Utilize robust database solutions to handle data integration, consolidation, and processing tasks. Databases provide superior data management capabilities, scalability, and advanced querying functionalities, reducing the potential for processing errors and enhancing data accuracy.
- Data Processing Frameworks: Explore data processing frameworks like Apache Spark or Apache Flink that offer scalable, fault-tolerant, and distributed data processing capabilities. These frameworks enable seamless integration with various data sources and provide built-in error handling mechanisms, ensuring accurate processing and minimizing the risk of revenue loss due to errors.
- Automation Tools: Leverage automation tools such as Azure Automation or AWS Step Functions to orchestrate data processing workflows. These tools offer a visual interface and built-in error handling capabilities, reducing the reliance on manual scripting and minimizing the potential for errors.
- Strengthening Security: In addition to revenue protection, transitioning away from legacy PowerShell scripts also strengthens security within financial institutions. PowerShell has been targeted by attackers exploiting zero-day vulnerabilities in the past, emphasizing the need for a more secure approach. By adopting modern technologies, such as database solutions and data processing frameworks, financial institutions can reduce the attack surface, enhance data protection, and safeguard against potential breaches.
The incident highlighting a PowerShell social attack within Microsoft Excel serves as a valuable lesson for financial institutions. To mitigate risks, enhance security, and safeguard revenue, it is crucial to transition away from legacy PowerShell scripts. Embracing modern technologies like database solutions, data processing frameworks, and automation tools empowers financial institutions to streamline operations, minimize processing errors, and strengthen security measures. By proactively adopting these technologies, financial institutions can protect their revenue, make informed decisions, and ensure the integrity of their data.
- https://www.securityweek.com/attacks-against-banks-leverage-macros-powershell/