Fairly common late 1990's 'copy' of the original Specialized FSR Stump jumper, using a single pivot rather than the Horst link Specialized used (which was patented back then). Several manufacturers toyed with this 'kinds a motorbike' frame design before falling back to more traditional 'tubes' design. Weight was always a problem as soon as you moved away from a triangle and had cantilevers with open ends or solid beams instead of rear triangle. Great thing about that era was frame designers were 'brave enough to be different' and so were consumers.
Shimano Deore indicates either a reasonable quality bike or it has been upgraded. Deore (on its own) was re-introduced as a name in 1999 with 9 speed.
Beyond that, it's not really possible to know the brand. Popular brands in your area, along with the front fork, could be used to trawl though the internet and find a likely match, but while I hold out hope we can help, I suspect finding the make/medel/brand will not be successful.
As far as the bike goes, based on year 2000+/-, best guess is Dual crown forks and Deore indicate it was probably built and marketed as a downhill bike. Single Pivot did not make great XC bikes back then with the shocks they had available. Deore quality indicates it is not a BSO from Walmart. Without actually inspecting the bike this is mostly speculation though.