You should consider the results of all engines, but give more weight to those known to use advanced, cloud-based technologies and to the consensus among well-regarded vendors. The behavioral analysis reports are often the most valuable part of a VirusTotal scan when the results are ambiguous. Although they are not traditional antivirus engines, the behavioral analysis reports on VirusTotal are an absolutely crucial component of a comprehensive threat assessment. These reports are generated by tools like VMRay or Joe Sandbox, which execute the file within a controlled, sandboxed environment. This allows them to document the file's actions, such as the creation of new files, network connections, or modifications to the registry. The behavioral report often serves as the "smoking gun," providing clear evidence of a file's true nature even when multiple antivirus engines fail to flag it. For instance, if a file goes undetected by various engines but the behavioral analysis shows it attempting to communicate with a known command-and-control server or dropping suspicious executable files, it is a definitive indicator of malicious intent. Therefore, a thorough review of these reports is essential.