Significant advancements in Information Technology (IT) have improved work processes, efficiency, and business operations, but these advancements bring environmental sustainability issues. IT's role in climate change, resource management, waste production, and public health is critical yet often overlooked. Excessive energy use in IT operations contributes to negative environmental impacts. This research focuses on analyzing the behavioral determinants influencing information and communication technology (ICT) employees' participation in Green Information System (Green IS) practices in Malaysia. Additionally, it seeks to ascertain whether Malaysian ICT employees have a clear intention of incorporating Green IS in a bid to combat the aforementioned issues and guarantee the viability of a sustainable green environment. The study employed quantitative methods, and data was collected from 183 respondents from various ICT employees working in Malaysia Digital (MD) Status companies. The collected data was analyzed to examine the four Technology Readiness Index (TRI) constructs-Optimism, Innovativeness, Insecurity, and Discomfort. Results indicated that Optimism and Innovativeness significantly influenced attitudes towards Green IS, while Insecurity had a negative impact, and Discomfort was insignificant. The findings revealed that subjective norms significantly influence Malaysian ICT employees more than perceived behavioral control. Attitude was a full mediator between TRI components and the willingness to implement Green IS. The study provides new insights into the TRI's application in Green IS and highlights attitude's mediating role. This emphasizes how crucial attitude is in determining users' intentions to adopt Green IS, underscoring the necessity of taking proactive measures to alter attitudes and perceptions of Green IS prior to its broader acceptance. Ultimately, the research revealed that attitude indirectly influences the genuine intention to adopt Green IS among Malaysian ICT employees. The findings contribute to formulating new policies to adopt green IS in organizations and raise awareness about environmental sustainability among employees.