Why didn't Huntress detect a known malicious file?
Huntress detects malware by analyzing persistence mechanisms used by malware to automatically run when the computer starts or a user logs in. This is what makes Huntress different from anti-virus products. Instead of scanning every file on the system or analyzing the behavior of running processes, Huntress looks at persistence mechanisms, such as services, drivers, registry run keys, and other auto-start locations provided by Windows. The intent of this strategy is to find persistent malware that has slipped past preventative solutions.
Since Huntress only looks for persistent malware, not all files on a system will be scanned.