Which tool helps in identifying the source of malicious files?

The Source of Infection Tool is designed specifically to trace the origins of malicious files back to their source. It identifies how and from where a threat has infiltrated the system, providing necessary details for remediation and prevention of future incidents. By analyzing logs, network traffic, and file behaviors, this tool effectively helps users understand the pathways that led to the infection.

In contrast, the other options serve different purposes: the Virus Removal Tool focuses on eliminating known infections, the Threat Detection System identifies potential threats based on behavior and signatures but does not track source details, and the File Integrity Checker monitors changes to files to ensure they have not been tampered with, rather than tracing their origins. Therefore, the Source of Infection Tool is the most relevant choice for identifying the source of malicious files.