Which of the following is supported as an IOC for Windows, Mac, and Linux?

The correct answer is IPv4 Addresses because they are a universal indicator of compromise (IOC) supported across Windows, Mac, and Linux operating systems. IOCs are crucial in identifying malicious activity, and during a potential incident response, monitoring and ensuring that certain IPv4 addresses are either blocked or monitored can help prevent or mitigate attacks across different platforms.

IPv4 addresses are integral to networking and are used for routing internet traffic. Their significance as an IOC lies in their ability to identify where suspicious traffic originates or to which malicious servers devices are connecting. Since all operating systems utilize the same underlying networking principles, keeping track of known bad IPv4 addresses is vital for threat detection in a heterogeneous environment.

While URLs, file names, and application names may also be indicative of compromise, their handling and relevance can vary across different operating systems due to differences in architecture, file systems, and application management. This inconsistency in support across platforms makes IPv4 addresses a more universally applicable IOC.