Hi PPobega,
I recommend checking SEP's risk history. Is a specific file listed as being that Bloodhound.boot? If so I would take a closer look at it, and contact Symantec Technical Support if in doubt.
At what level do you have your Bloodhound detections set? The higher that setting is, ther more likely SEP is to make a "false positive" heuristic detection. It will err on the side of caution. If your settings are at their maximum value and there are no future reports, there may not be anything to worry about.
In the meantime, I recommend that measures are taken to keep the latest definitions on the server, make sure that the SEP version is at least MR4 MP2 throughout the organization, and see that all MS patches and patches from other third-party products like Adobe are up-to-date. A bit of prevention, before any outbreak, is worth a whole lot of effort after your network has been compriomised!
Thanks and best regards,
Mick