If Tina discovers malware sharing in an online group, what is the recommended action?

Stopping participation in the group is a prudent action because engaging with a community that facilitates or condones malware sharing poses significant risks not only to personal security but also to the security of others in the network. By withdrawing from the group, Tina minimizes her exposure to potentially harmful content and reduces the risk of inadvertently supporting or propagating illegal activities.

Remaining in such a group could lead to ethical dilemmas or legal complications. Additionally, ceasing involvement allows Tina to refrain from witnessing or engaging with malicious content any further, which is crucial in a digital landscape where malware poses increasing threats to individual and organizational cybersecurity.

In this context, while reporting the group could also be a valid response, it comes after ensuring one's own safety and security. Similarly, doing nothing would leave Tina exposed, and reporting solely to (ISC)² might not address the immediate threat. Therefore, stepping away from the group is the most direct way for Tina to protect herself and contribute to a safer online environment.